concentrations of selected herbicides, herbicide metabolites, and

Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 through September 1993

By ELISABETH A. SCRIBNER, DONALD A. GOOLSBY, E. MICHAEL THURMAN, MICHAEL T MEYER, and WILLIAM A. BATTAGLIN

U.S. GEOLOGICAL SURVEY

Open-File Report 96-393

Prepared as part of theTOXIC SUBSTANCES HYDROLOGY PROGRAM

Lawrence, Kansas 1996

U.S. DEPARTMENT OF THE INTERIOR

BRUCE BABBITT, Secretary

U.S. GEOLOGICAL SURVEY

Gordon P. Eaton, Director

The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey.

For additional information write to: Copies of this report can be purchased from:

District Chief U.S. Geological Survey 4821 Quail Crest Place Lawrence, Kansas 66049-3839

U.S. Geological Survey Branch of Information Services Box 25286 Denver, CO 80225-0286

CONTENTS

Abstract..............................................................................................................................................................................^ 1Introduction ........................................................ 1

Purpose and Scope....................................................................................................................................................... 4Objectives of Study ..................................................................................................................................................... 4

Description of Study Area..................................................................................................................................................... 4Selection of Reservoirs.......................................................................................................................................................... 5Methods.............................................................................................................................................................^ 5

Sample-Collection Schedule........................................................................................................................................ 5Sample-Collection Methods........................................................................................................................................ 5Sample Preparation...................................................................................................................................................... 10Laboratory Methods.................................................................................................................................................... 10

Gas Chromatography/Mass Spectrometry......................................................................................................... 10Solid-Phase Extraction and Enzyme-Linked Immunosorbent Assay for Alachlor Ethane

Sulfonic Acid............................................................................................................................................... 11Nutrients............................................................................................................................................................ 11

Quality Assurance.................................................................................................................................................................. 11Decontamination Procedures....................................................................................................................................... 11Sample Collection and Analysis.................................................................................................................................. 11GasChromatographyMassSpectrometry..............................» 12Solid-Phase Extraction and Enzyme-Linked Immunosorbent Assay for Alachlor Ethane Sulfonic Acid.................. 12

Ancillary Data........................................................................................................................................................................ 12Analytical Results................................................. 12References Cited..................................................................^ 14

FIGURES

1. Maps showing location of study area and selected reservoirs in the Midwestern United States............................ 22. Maps showing distribution of herbicide detections in selected Midwestern reservoirs and reservoirs in

which one or more herbicides exceeded U.S. Environmental Protection Agency Maximum Contaminant Levels or Health Advisory Levels for drinking water during late April through mid-May and late June through early July 1992........................................................................................................................................... 15

3. Boxplots showing the concentrations of alachlor, alachlor ethane sulfonic acid, atrazine, cyanazine, andmetolachlor during eight sampling periods in 1992-93.......................................................................................... 16

TABLES

1. Atrazine concentrations in water samples collected from selected Midwestern reservoirs during wintermonths, 1990-92..................................................................................................................................................... 4

2. Selected characteristics of reservoirs sampled for this study.................................................................................. 63. Concentrations of selected herbicides and metabolites in quality-assurance samples, 1992.................................. 134. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993......... 195. Analytical results for selected herbicides and six metabolites in samples collected from 76 reservoirs in the

Midwestern United States, April 1992 through September 1993 ........................................................................... 646. Analytical results for selected herbicides and six metabolites in samples collected from top and bottom of

17 reservoirs in the Midwestern United States, April 1992 through September 1993............................................ 937. Herbicide compounds analyzed and percentage of detections in 76 reservoirs for eight sampling periods

during April 1992 through September 1993 ........................................................................................................... 95

Contents

TABLES Continued

8. Physical properties and analytical results for nutrients collected from 76 reservoirs in the MidwesternUnited States, April 1992 through September 1993............................................................................................... 96

9. Physical properties and analytical results for nutrients collected from top and bottom of 17 reservoirs inthe Midwestern United States, April 1992 through September 1993..................................................................... 127

CONVERSION FACTORS, MISCELLANEOUS ABBREVIATIONS, AND ABBREVIATED WATER-QUALITY UNITS

Multiplyacre

acre-foot (acre-ft)acre-foot per acre (acre-ft/acre)

foot (ft)mile (mi)

pound (Ib)square mile (mi2)

ton

By4,0471,233

0.30480.30481.609

453.62.5900.9072

To obtainsquare metercubic metercubic meter per square metermeterkilometergramsquare kilometermegagram

Temperature can be converted to degrees Celsius (°C) or degrees Fahrenheit (°F) by the equations:

°C=5/9 (°F-32) °F=9/5 (°C)+32.

Miscellaneous Abbreviations

electronvolt (eV)inside diameter (id)mass to charge (m/z)millisecond (ms)milliseconds per ion (ms/ion)volt (V)volume-to-drainage-area ratio (Vol/DA)

Abbreviated Water-Quality Units

kilopascal (kPa)liter (L)meter (m)microgram per liter (|ig/L)microliter (uL)micrometer (urn)milligram per liter (mg/L)milliliter (mL)milliliter per minute (mL/min)millimeter (mm)nanogram (ng)nanogram per microliter (ng/uL)

IV Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoir, April 1992 through September 1992

Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow From Selected Midwestern Reservoirs, April 1992 through September 1993By Elisabeth A. Scribner, Donald A. Goolsby, E. Michael Thurman, Michael T. Meyer, and William A. Battaglin

Abstract

Water samples were collected from 76 reser voirs in the Midwestern United States from April 1992 through September 1993 for the analy sis of selected herbicides, herbicide metabolites, and nutrients. This report presents a description of the study area, selection of reservoirs, sample- collection methods, sample preparation, labora tory methods, herbicide, nutrient, and quality- assurance data, and analytical results. Reservoir sites were sampled in 1992 during early spring before application of herbicides, during the first major runoff after application of herbicides and after significant flushing of the reservoir during late summer, and during early fall. In 1993, sam ples were collected during early winter, late win ter, and midsummer and during September following the 1993 flood. During August 1992, water temperature and dissolved-oxygen profiles were obtained from 17 selected reservoirs to investigate the effect of stratification on herbicide concentrations. Samples were analyzed by gas chromatography/mass spectrometry for 11 herbi cides and 6 metabolites and by solid-phase extrac tion and enzyme-linked immunosorbent assay for alachlor ethane sulfonic acid.

The data from the reservoir study have been useful in determining the occurrence and tempo ral distribution of selected herbicides and their metabolites in outflow from selected reservoirs in

the upper Midwest. The reservoir study also pro vided data to determine if the persistence of large concentrations of herbicides in reservoir outflow can be quantified on the basis of reservoir and drainage-basin characteristics, water and land use, herbicide use, and climate.

INTRODUCTION

This is the fifth in a series of water-quality reports intended to present the analytical results from studies of herbicides and nutrients in water resources of the Midwestern United States. This report presents the analytical results from a study of 11 preemergent her bicides, six triazine metabolites, and nutrients in out flow from 76 reservoirs located in 11 Midwestern States (fig. 1). Previous reports have presented analyt ical results from regional studies of herbicides and nutrients in ground water (Kolpin and others, 1993), surface water (Scribner and others, 1993), storm run off (Scribner and others, 1994), and precipitation (Goolsby and others, 1995). This study of herbicides and nutrients in reservoirs was conducted during 1992-93 and is one of several regional-scale studies conducted by the U.S. Geological Survey (USGS) as part of the Toxic Substances Hydrology Program.

Modern agricultural practices in the United States often require extensive use of herbicides for produc tion of corn, soybeans, sorghum, and other row crops. Data compiled by Gianessi and Puffer (1991) indicate that about two-thirds of the 628 million Ib of

Introduction

100°

EXPLANATION

Reservoir selected for study Number corresponds to map number used in tables

200 MILES I

I 80°

I

Base from U.S. Geological Survey digital survey, 1 :2,000,000, 1972Albers Equal-Area Conic projectionStandard parallels 39°30' and 43°30', central meridian -90°30'

Figure 1. Location of study area and selected reservoirs in the Midwestern United States.

herbicides applied annually in the United States (Aspelin and others, 1992) are used in crop production in the Midwestern United States. As a result, the Mid west is a major source area for transport of herbicides into the atmosphere, ground water, and streams. A summary of agricultural practices and herbicide and

land use for the Midwestern United States, by county, can be found in Battaglin and Goolsby (1995).

Reservoirs are an important part of hydrologic systems in the Midwestern United States. According to data compiled by Ruddy and Hitt (1990), about 440 large reservoirs in 11 upper Midwestern States

2 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993 ,

discharge streamflow to the Mississippi River. The function of these reservoirs is to impound surface water for many uses, including flood control, hydro- power, navigation, recreation, and aquatic life habi tat. These large reservoirs and numerous small reservoirs also serve as sources of drinking water for public supplies.

In addition to storing surface water, reservoirs also store undesirable substances such as sediment and toxic chemicals including pesticides. Much of the sediment entering reservoirs is deposited on the bot tom of the reservoirs. However, chemicals such as soluble herbicides generally remain in the water col umn and are stored only temporarily until they are flushed from the reservoir or removed from solution by biotic and abiotic processes.

Storage of herbicides is a potential problem in res ervoirs that receive drainage from agricultural areas in the upper Midwest. Recent studies by the USGS (Thurman and others, 1991,1992; Goolsby and others, 1993; Goolsby and Battaglin, 1995) have shown that most streams in the upper Midwest contain herbicides at some time during the year. Large quantities of her bicides are flushed from agricultural fields each spring and summer during rainfall following application of herbicides. Goolsby and Battaglin (1995) showed that median concentrations of the herbicides alachlor, atrazine, cyanazine, and metolachlor in streams increased from March 1989 to July 1989. Also, Thurman and others (1991) showed that the median concentrations of herbicides in Midwestern streams in 1989 ranged from less than 0.30 |J,g/L before planting to as much as 3.0 (ig/L after planting and that the maximum concen trations in a few small streams reached 100 (ig/L. During late spring and early summer, concentrations of atrazine can exceed the U.S. Environmental Protec tion Agency's (1992) Maximum Contaminant Level (MCL) for finished drinking water of 3.0 (ig/L for sev eral weeks to several months in both small streams and large rivers, such as the Mississippi River (Goolsby and others, 1993).

Because reservoirs collect and store water, they can be affected by storm runoff that contains large concentrations of herbicides for a much longer period of time than the streams that supply the reservoirs (Stamer and Zelt, 1992; Stamer and others, 1995). This can substantially affect the water quality of streams downstream from reservoirs.

The length of time that reservoirs discharge water with increased concentrations of herbicides depends

on a number of factors, including residence time of water in the reservoir, timing of inflow to the reservoir, land use and herbicide use in the contributing drainage area, and the timing and intensity of rainfall. Unregu lated streams exhibit the flush effect (Thurman and others, 1991), which can produce high concentrations of herbicides for short periods of time. In contrast, maximum concentrations of herbicides in streams reg ulated by reservoirs are much lower, but increased concentrations can persist for much longer periods of time. Stamer and Zelt (1992) have shown that atrazine concentrations in Perry Lake, Kansas, remained near or greater than the MCL of 3.0 |ag/L from March 1989 through October 1989 and were greater than 1.0 |J,g/L through February 1990, whereas atrazine concentra tions in the principal tributary to Perry Lake exceeded the MCL for only a few months during late spring. Atrazine concentrations in some samples collected from the tributaries exceeded 10 [ig/L during late spring. Most of the water in Perry Lake was replaced with spring runoff containing these increased atrazine concentrations. Because little additional inflow to Perry Lake occurred after early summer, this "herbi cide-enriched" water was stored in the reservoir until the next spring when the cycle was repeated.

The process of storage and attenuation of herbi cides documented in Perry Lake occurs in most other Midwestern reservoirs to a greater or lesser degree depending on the physical and hydrologic characteris tics of the reservoirs and land use in the reservoir drainage basins. Data on file at USGS, Lawrence, Kansas, show atrazine concentrations in mid-winter samples collected during 1990-92 from several large reservoirs in Illinois, Iowa, Kansas, and Missouri (table 1). Water samples collected at the outflow from many of these reservoirs had atrazine concentrations of at least 2.0 |j,g/L during this time, which likely reflected the storage of herbicide-enriched inflow orig inating from the spring flush.

Processes such as microbial degradation, hydroly sis, photolysis, sorption, and volatilization could serve to remove herbicides from solution in reservoirs (Paris and Lewis, 1973; Butler and others, 1975; Geller, 1980; Jones and others, 1982; Jones and Winchell, 1984; Dries and others, 1987; Pelizzetti and Tosato, 1990; Plimmer, 1990; Goldberg and others, 1991; Kolpin and Kalkhoff, 1993). The rates at which these processes may occur vary for each herbicide and are a function of many factors including water temperature, pH, and dissolved oxygen. Herbicide metabolites

Introduction

Table 1. Atrazine concentrations in water samples collected from Midwestern reservoirs during winter months, 1990-92

[Data on file with U.S. Geoloigcal Survey, Lawrence, Kansas. Vol/DA, volume-to-drainage-area ratio; acre-ft, acre-feet; GC/MS, gas chromatography/mass spectrometry; ELISA, enzyme-linked immunosorbent assay; (ig/L, micrograms per liter, --, not data]

Map no. (fig. 1) Reservoir name

1458----

2022232324--

29

4346

Carlyle Lake outflowLake Decatur outflowLake Shelbyville outflowRend Lake spillwayLake Springfield at Spaulding DamLake Springfield at Sugar Creek

Coralville LakeLake Red RockRathbun LakeRathbun LakeSaylorville LakeCorydon Reservoir

Perry Lake

Long Branch LakeSmithville Lake

Sample Atrazine date concentration

(month/day Vol/DA by GC/MS /year) (acre-ft/acre) ftig/L)

Illinois

01/03/9201/08/9201/08/9201/02/9201/30/9201/30/92

Iowa

02/21/9202/12/9212/01/9002/20/9202/12/9202/01/92

Kansas

02/03/91Missouri

12/01/9012/01/90

0.14.05.31.59.34.34

.01

.01

.58 3.7

.58

.02--

.34 3.9

.50 2.01.1 4.0

Atrazine concentration

by ELISA (H9/L)

2.3.20

1.1.60

4.02.5

.20

.20--

2.8.10

10

--

----

such as deethylatrazine and deispropylatrazine (Thur- man and others, 1991), cyanazine amide, deethylcyanazine, and deethylcyanazine amide (Meyer, 1994), and alachlor metabolites (Pereira and Rostad, 1990; Aga and others, 1994; Thurman and others, 1996) have been detected in samples from streams. Addi tional metabolites are likely to be present, but suitable analytical methods are not presently available to test for all of them.

Purpose and Scope

The purpose of this report is to describe the data- collection and analytical methods, the onsite and labo ratory quality-assurance procedures, the reservoir vol ume, evaporation, and stage measurements, and to present the results of analyses for 11 herbicides, 6 metabolites, and nutrients. These data were derived from samples collected at 76 Midwestern reservoirs during April 1992 through September 1993.

Objectives of Study

ie primary objectives of the study were to deter- the occurrence and temporal distribution of

selected herbicides, herbicide metabolites, and nutri ents in the outflow from selected reservoirs in the upper Midwest and to determine if the persistence of large concentrations of herbicides in reservoir outflow coulp be related on the basis of reservoir and drainage- basift characteristics, water and land use, herbicide use, and climate.

DESCRIPTION OF STUDY AREA

The study area (fig. 1) is defined as all hydrologic units in parts of 11 States (Illinois, Indiana, Iowa, Kan sas, Minnesota, Missouri, Nebraska, North Dakota, Ohio], South Dakota, and Wisconsin) that drain to the Ohio], upper Mississippi, and lower Missouri Rivers. Thisjarea comprises about 450,000 mi2 and is virtually

Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993

the same area covered by the 1989-90 reconnaissance of herbicides in streams (Thurman and others, 1991, 1992; Scribner and others, 1993).

SELECTION OF RESERVOIRS

Reservoirs studied were selected from the reser voir data base compiled by Ruddy and Hitt (1990). This data base contains information for about 440 res ervoirs in the study area that have a normal storage volume of 5,000 acre-ft or maximum capacities of at least 25,000 acre-ft. To meet the objectives of the study, data on reservoir volume and reservoir dis charge (on at least a monthly frequency) were needed to determine the residence time of water in the reser voir and the timing of outflow. In addition, the reser voir outflow had to be accessible for sampling. These data were screened, with the assistance of USGS dis trict offices, to determine which reservoirs met the selection criteria. As a result of this screening, 74 res ervoirs in the reservoir data base were selected for sampling. Two additional reservoirs, Lakes Monona and Waubesa in Wisconsin (map numbers 71 and 72, fig. 1) which form a chain of reservoirs receiving out flow from Lake Mendota (map number 69, fig. 1) were also sampled. These three reservoirs were treated as a single unit. A listing of all 76 reservoirs that were sampled, along with selected characteristics, are given in table 2. The location of these reservoirs is shown in figure 1.

METHODS

Sample-Collection Schedule

Outflow from each reservoir was sampled eight times (approximately bimonthly) from April 1992 through September 1993. The timing and frequency of these samples made it possible to determine approx imately when maximum and minimum concentrations of herbicides occurred in the reservoir outflow.

The time of sample collections were:(1) Late April or early May 1992 Samples were col

lected before significant postplanting reservoir discharge occurred.

(2) Late June or early July 1992 Samples were col lected after significant postplanting runoff and flushing of the reservoir had occurred.

(3) Late summer or late August 1992.(4) Early fall or mid-October 1992.(5) Early winter or early January 1993.(6) Late winter or mid-March 1993.(7) Midsummer 1993.(8) September 1993 following the 1993 flood.

Sample-Collection Methods

Water samples were collected downstream from each reservoir near the centroid of flow or at other out flow points that would provide a representative sample of reservoir discharge. If the reservoir had both a top and bottom release, the sample was collected at a suffi cient distance downstream to ensure adequate mixing, or an equal-width increment, depth-integrated sam pling technique was used (Ward and Hair, 1990). About 2 L of water were obtained using depth- integrating samplers. The collection bottle used in the sampler was made of glass and precleaned as described in the "Quality Assurance" section under "Decontamination Procedures." If depth-integrated samples from several points in the cross section were required to obtain sufficient sample volume, the indi vidual samples were composited in a precleaned glass, Teflon, or stainless-steel container that held 2 to 4 L. The compositing container and bottles used in the sampler were rinsed thoroughly with sample water before compositing began.

In late July or August 1992, near the time of maxi mum water stratification, temperature and dissolved- oxygen profiles were obtained at 17 selected reservoirs (see table 2) using a dissolved-oxygen meter with a thermister. Profile measurements were made at approximately 3-ft intervals in the deepest part of each reservoir. A closer spaced interval was used in the thermocline region, which is the region of maximum rate of water-temperature change. At each depth, tem perature and dissolved-oxygen readings were allowed to stabilize before results were recorded. Water sam ples for herbicide and nutrient analyses were collected from these reservoirs within 3 ft of the water surface and as close to the reservoir bottom as possible with out disturbing the sediment by using a Kemmerer-type point sampler. Sampling was conducted at the same locations that temperature and dissolved-oxygen pro files were measured and were far enough away from reservoir outlet structures to avoid mixing effects that might be caused by outflow.

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Sample Preparation

Herbicide samples were filtered through a 1-jim glass-fiber filter using a peristaltic pump. Nutrient samples were filtered through 0.45-jim membrane fil ters. Filters were leached with about 200 mL of dis tilled water followed by 25 to 50 mL of sample prior to collection of the sample.

The filtrate for herbicide analysis was collected in four precleaned, baked 125-mL amber glass bottles. The filtrate for nutrient analysis was collected in a 125-mL amber polyethylene bottle and treated with a mercuric chloride preservative. About 100 mL of sample were filtered into a 250-mL polyethylene bot tle for silica analysis. The remainder of the water in the compositing container was used for onsite mea surements of specific conductance and pH. All sam ples were chilled immediately and shipped to the appropriate laboratory within 3 days of collection. Herbicide samples were sent to the USGS laboratory in Lawrence, Kansas, for gas chromatography/mass spectrometry (GC/MS) analysis (Thurman and others, 1990) and enzyme-linked immunosorbent assay (ELISA). Nutrient and silica samples were shipped to the USGS National Water-Quality Laboratory in Arvada, Colorado, for analysis (Fishman and Fried- man, 1989).

Laboratory Methods

Herbicide sample bottles received at the USGS laboratory in Lawrence, Kansas, were logged in, assigned identification numbers, and refrigerated at 4 °C until analyzed. All of the reservoir samples were analyzed for 11 herbicides, two atrazine metabolites, and three cyanazine metabolites by GC/MS. The anal ysis included alachlor, ametryn, atrazine, cyanazine, metolachlor, metribuzin, prometon, prometryn, pro- pazine, simazine, and terbutryn as well as two atrazine metabolites, deethylatrazine and deisopropylatrazine, and three cyanazine metabolites, cyanazine amide, deethylcyanazine, and deethylcyanazine amide. In addition, the ethane sulfonic acid (ESA) metabolite of alachlor was isolated by solid-phase extraction (SPE) and analyzed by ELISA using the method of Aga and others (1994).

Gas Chromatography/Mass Spectrometry

Samples selected for GC/MS confirmation were extracted on carbon-18 (C^g) solid-phase cartridges by an automated procedure (Meyer and others, 1993). A Waters Millilab workstation was used for solid-phase extraction of the analytes. C 18 Sep-Pak-Plus car- tri(jlges were preconditioned sequentially with 2 mL each of distilled water, 6 mL ethyl acetate, 2 mL methanol, and 3 mL distilled water. Each 123-mL water sample was spiked with 100 \\L of a surrogate stan- darld, terbuthylazine (1.23 ng/jjL), and pumped through the cartridge at a rate of 20 mL/min by the robotic probe. Analytes were eluted with ethyl acetate and spiked robotically with 100 ng of phenanthrene- d 1Q. The ethyl acetate layer was transferred by probe to a clean test tube. The robotic probe was washed betjween samples by immersing in ethyl acetate and bubbling air through the probe to prevent sample cross contamination of herbicide standards. Finally, the extj-act was evaporated with a Turbovap at 45 °C under a nitrogen stream to a volume of 100 jlL and pipetted into a lOO-jlL crimp-top, polystyrene vial with a glass liner.

For the analysis of the 11 herbicides and atrazine metabolites, deethylatrazine and deisopropylatrazine, automated GC/MS analyses of the sample eluates wer[e performed on a Hewlett-Packard Model 58^0 GC and a 5970A mass selective detector (MSD). Operating conditions were as follows: ionization volt age! 7® e^' ion-source temperature, 280 °C; electron multiplier, 400 V over the autotune voltage; direct capjllary interface at 280 °C, initial GC oven tempera- turd, 60 °C, tuned daily with perfluorotributylamine; dwe|ll time, 25 to 50 ms/ion. Separation of the herbi- cid4s was carried out using a Hewlett Packard fused- silicja, ultra-1 capillary, 12 m x 0.2 mm id, GC column of njiethyl silicone film with a thickness of 0.33 jj,m. Helium was used as the carrier gas at a flow rate of 1 mL/min and a head pressure of 35 kPa. The column temperature was held at 60 °C for 1 minute and then ramped at 6 °C per minute to 250 °C. Injector temper- aturj^ was 280 °C. The filament and multiplier were not turned on until 15 minutes into the analysis. Quantification of the base peak of each compound was basejd on the response of the 188 ion m/z of the inter nal standard, phenanthrene-d10. Confirmation of the compound was based on the presence of the molecular ion and two confirming ions with a retention-time match of ±0.2 percent relative to phenanthrene-dio- The (preceding procedure is described in detail by

10 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients In Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993

Thurman and others (1990) and Meyer and others (1993).

For the separation of the cyanazine metabolites, cyanazine amide, deethylcyanazine, and deethylcyanazine amide, a Hewlett Packard ultra-2 capillary, 12 m x 0.2 mm, GC column of methyl silicone with 5-percent phenyl film was used. The GC/MS condi tions for these analysis were the same as for the regu lar herbicide method except for the following: direct capillary interface at 210 °C, initial GC oven tempera ture, 140 °C; ramp rate, 15 °C per minute to 250 °C. Atrazine, cyanazine, deethylatrazine, and deisopropylatrazine were also analyzed to compare against the preceding GC/MS method. The quantitation limit for atrazine, deethylatrazine, deisopropylatrazine, cyanazine, cyanazine amide, and deethylcyanazine was 0.05 p,g/L and for deethylcyanazine amide, 0.50 \ig/L. This procedure is described by Meyer (1994).

Solid-Phase Extraction and Enzyme-Linked Immunosorbent Assay for Alachlor Ethane Sulfonic Acid

Alachlor ESA was analyzed by SPE-ELISA using the method described in Aga and others (1994). The SPE procedure was automated with a Waters Millilab workstation for analysis of the analytes. The C 18 Sep- Pak cartridges were preconditioned sequentially with 2 mL methanol, 6 mL ethyl acetate, 2 mL methanol, and 2 mL distilled water. Each 100-mL water sample was passed through a cartridge at a flow rate of 20 mL/min. The cartridge was eluted first with 3 mL ethyl acetate to remove parent alachlor and then eluted with 3 mL methanol to remove alachlor ESA, which was collected in a separate test tube. The methanol extracts were evaporated to dryness under nitrogen at 45 °C using a Turbovap. The samples then were reconstituted with 5 mL of distilled water and ana lyzed using an Alachlor RaPID assay kit. The concen trations of alachlor ESA were calculated by the following equation (Brady, 1995):

logit(y)=ln(y/l-y), (1)

where y = absorbance reading, which transformed data using alachlor ESA standards of 0, 1.0, 5.0, and 20 flg/L. Every 10th sam ple was analyzed in duplicate.

Nutrients

Dissolved nitrite plus nitrate, nitrite, ammonia, and orthophosphate were determined by an automated colorimetric procedure (Fishman and Friedman, 1989). Dissolved nitrate was calculated as the differ ence between determinations for nitrite plus nitrate and nitrite. Silica was determined by an automated procedure described in Fishman and Friedman (1989).

QUALITY ASSURANCE

Quality-assurance procedures for this study were carried out by USGS personnel in accordance with a written work plan for the study.

Decontamination Procedures

Onsite quality-assurance procedures required all bottles and sampling equipment to be cleaned by washing glass containers, filter units, and tubing with a phosphate-free laboratory detergent and rinsing with tap water, then rinsing with organic-free, deionized, or distilled water, rinsing with methanol, and rinsing again with organic-free water to remove traces of methanol. Bottles were inverted to drain and dry.

Sample Collection and Analysis

Quality-assurance samples consisted of blind rep licates, blind spikes, field equipment blanks, and labo ratory duplicates. About 5 percent of the samples were blind replicates, and an additional 5 percent of the samples consisted of blind spikes and field equipment blanks. All samples were collected in duplicate or triplicate. About 10 percent of all samples were ana lyzed in duplicate at the USGS laboratory in Lawrence, Kansas.

In addition, blind replicate samples for herbicide analysis were obtained during each sampling period. Replicates of regular samples were labeled with ficti- cious site information and submitted to the USGS lab oratory in Lawrence, Kansas, along with the regular samples for herbicide analysis. Results for the blind replicate analyses are included under sample type "BD" in table 5 at the end of this report.

Blind spikes for herbicide analysis were indepen dently prepared by the USGS National Water-Quality Laboratory in Arvada, Colorado, and submitted by

Quality Assurance 11

several USGS offices. These samples consisted of 125-mL bottles filled with solutions of known herbicide concentrations. They were labeled as reser voir samples and sent to the USGS laboratory in Lawrence, Kansas. Results for spike samples ana lyzed during the eight sampling rounds are shown in table 3.

Field equipment blanks for herbicides were obtained on the first sample processed and about every 20th sample thereafter. Organic-free water was fil tered into four 125-mL amber baked glass bottles labeled as a field equipment blank and shipped over night to the USGS laboratory in Lawrence, Kansas, along with the regular herbicide samples. During the 1992-93 sampling period, no herbicides were detected in any of the 37 field equipment blanks analyzed.

Gas Chromatography/Mass Spectrometry

For the GC/MS method, each water sample to be analyzed for herbicides and metabolites was spiked with a surrogate standard, terbuthylazine. An internal standard, phenanthrene-diQ, was added to the sample after it was extracted by SPE. The ratio of the terbuth ylazine to the phenanthrene-djQ was used to calculate the percent "recovery" of the sample. The internal standard was used to create a ratio with each individ ual compound to calculate concentrations. Quality- assurance protocols, to ensure the integrity of the sam ple handling, extraction, and analytical procedures, consisted of 10 percent blank samples and 10 percent standard solutions for the 1992-93 sampling period. Results of the laboratory duplicate analyses are included under sample type "LD" in table 5 at the end of this report.

Solid-Phase Extraction and Enzyme- Linked Immunosorbent Assay for Alachlor Ethane Sulfonic Acid

For the alachlor ESA method, results were quanti fied with solutions of alachlor concentration that ranged from 0 to 20 |Ag/L. Using the calibration curves, optical densities associated with calibration standards were examined. Samples were analyzed in duplicate and averaged. The reporting limit for alachlor ESA was 0.10 (ig/L.

ANCILLARY DATA

The following information was recorded at all sites during each sampling period: the type of sam pling location, type and quantity of reservoir discharge, unusual streamflow conditions, weather conditions, and debris conditions in the stream. The volume of water in reservoir storage, in acre-feet, was alsj) obtained for each sampling period from USGS records or U.S. Army Corps of Engineers records.Dai a on gaged reservoir inflow and outflow, and evaporation, when available, were also accumulated throughout the period of study. These data were obtjained as monthly totals from the U.S. Army Corps of Engineers records. Results are presented in table 4 at the end of this report.

[ Ancillary data including land use, herbicide use, contributing drainage area, and rainfall were obtained frojn the following sources and stored in a geographic information system (GIS) (Battaglin and Goolsby, 1995):

Land use 1987 Census of agriculture data (U.S. Department of Commerce, 1989a, 1989b)

Herbicide use (Gianessi and Puffer, 1991).

ANALYTICAL RESULTS

Analytical results for nine herbicides and six abolites in water-quality samples collected from eservoirs during 1992-93 are presented in table 5

me 76at the end of this report. Two additional herbicides, pronetryn and terbutryn, were analyzed but not detected. Analytical results for herbicide samples col lected near the top and bottom of 17 reservoirs are given in table 6. These data show, except for one res ervoir in Indiana and two reservoirs in Ohio, that there was very little difference between top and bottom concentrations.

A summary of results presented in table 7 shows thali atrazine was the most frequently detected and persist^nt herbicide, followed by alachlor ESA, deethyla- traz^ne, deisopropylatrazine, metolachlor, cyanazine ami^le, and cyanazine.

The distribution of herbicide detections in Mid- wes^ern reservoirs and reservoirs in which concentra tion^ of one or more herbicides exceeded U.S. Environmental Protection Agency Maximum Contaminant Levels or Health Advisory Levels for drinking water during late April through mid-May and

12 Concentrations of Selected Herbicides, Herbicide Metabolites, and Mutrients In Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993

Tabl

e 3.

C

once

ntra

tions

of s

elec

ted

herb

icid

es a

nd m

etab

olite

s in

qua

lity-

assu

ranc

e sa

mpl

es,

1992

[Ala

chlo

r eth

ane

sulf

onic

aci

d, c

yana

zine

am

ide,

dee

thyl

cyan

azin

e, a

nd d

eeth

ylcy

anaz

ine

amid

e w

ere

not s

elec

ted

for q

ualit

y-as

sura

nce

proc

edur

es;

amet

ryn,

pro

met

ryn,

and

terb

utry

n w

ere

not d

etec

ted;

D

EA

, dee

thyl

atra

zine

; DIA

, dei

sopr

opyl

atra

zine

; GW

M, b

lind

spik

e sa

mpl

e; ji

g/L

, mic

rogr

ams

per l

iter;

<, le

ss th

an; o

ne-h

alf d

etec

tion

limit

was

use

d in

cal

cula

tion

of m

ean

valu

es; N

WQ

L, U

.S.G

eolo

gica

l Su

rvey

Nat

iona

l Wat

er-Q

ualit

y L

abor

ator

y, A

rvad

a, C

olo.

]

Dat

e of

co

llect

ion

Qua

lity-

assu

ranc

e A

traz

ine

(mon

th/d

ay)

iden

tific

atio

n (H

9/L)

S. /tlcal Results

08/2

108

/21

08/2

108

/26

08/2

608

/27

08/2

708

/27

Mea

n

The

oret

ical

NW

QL

08/2

408

/24

08/2

408

/25

08/2

508

/27

08/2

7M

ean

The

oret

ical

N

WQ

L

GW

M1

GW

M1

GW

M1

GW

M1

GW

M1

GW

M1

GW

M1

GW

M1

GW

M1

GW

M1

GW

M2

GW

M2

GW

M2

GW

M2

GW

M2

GW

M2

GW

M2

GW

M2

GW

M2

0.09 .0

8.0

8.0

8.0

9.0

9.0

8.0

6.0

8

.07

.08

.69

.69

.71

.77

.78

.83

.85

.76

.70

.76

DEA 0.10 .1

0.1

0.1

0.1

0.1

2.1

0.0

9.1

0

.07

.13

.75

.78

.78

.84

.93

.99

.97

.86

.70

1.1

DIA

(ug/L

)<0

.05

.05

.05

.05

.05

.06

.05

.05

.05

.07

<.05 .3

5.3

6.3

5.3

7.3

3.3

6.3

9.3

6

.71

.38

Ala

chlo

r

0.08 .0

8.0

7.0

7.0

8.0

8.0

7.0

6.0

7

.07

.08

.55

.57

.56

.62

.73

.78

.74

.65

.71

.75

Cya

nazi

ne

0.05 .0

5<.

05 .05

.07

.06

.06

.06

.05

.07

.10

.37

.35

.35

.40

.64

.67

.69

.50

.69

.80

Met

ol-

achl

or(ng

/L)

0.08 .0

7.0

7.0

7.0

7.0

7.0

7.0

6.0

7

.07

.07

.56

.50

.51

.56

.70

.74

.69

.61

.70

.72

Met

ri-

buzi

n

0.08 .0

7.0

7.0

7.0

8.0

9.0

8.0

7.0

8

.07

.10

.51

.55

.54

.59

.78

.83

.81

.66

.70

.72

Prom

eton

0.07 .0

7.0

6.0

7.0

7.0

7.0

6.0

5.0

7

.07

<.05 .5

7.5

8.5

9.6

3.6

7.7

1.7

2.6

4

.70

.64

Prop

azin

e(H

9/L)

<0.0

5<.

05<.

05<.

05<.

05<.

05<.

05<.

05<.

05

0 <.05 .0

8.0

9.0

8.0

9.0

8.0

8.0

8.0

8

.00

.08

Sim

azin

e

0.07 .0

7.0

7.0

7.0

7.0

7.0

6.0

5.0

7

.07

.10

.56

.57

.66

.62

.58

.62

.63

.61

.70

.74

late June through early July 1992 are shown in figure 2. Concentrations of alachlor, alachlor ESA, atrazine, cyanazine, and metolachlor for each of the eight sampling periods (data from table 5) are shown in figures 3A-E. These figures also show that atrazine had the largest concentration, followed by alachlor ESA, metolachlor, cyanazine, and alachlor.

Analytical results for nutrients are given in table 8 for the 76 reservoirs and in table 9 for samples col lected near the top and bottom of 17 reservoirs. Nitrate, nitrite, and silica concentrations in streams are derived from many anthropogenic and natural sources, including chemical fertilizers, animal wastes, domes tic sewages, legumes, mineralization of vegetation, and soil organic matter. Studies in the Midwest have provided results on the geographic distribution of nitrate in streams and also indicate that processes in addition to those governing herbicide transport are important in controlling the transport of nutrients to streams (Goolsby and others, 1993).

REFERENCES CITED

Aga, D.S., Thurman, E.M., and Pomes, M.L., 1994, Deter mination of alachlor and its ethane-sulfonic acid metabolite in water by solid-phase extraction and enzyme-linked immunosorbent assay: Analytical Chemistry, v. 66, no. 9, p. 1495-1499.

Aspelin, A.L., Grube, A.H., and Toria, R., 1992, Pesticide industry sales and usage, 1990 and 1990 and 1991 mar ket estimates: Washington, D.C., U.S. Environmental Protection Agency, 37 p.

Battaglin, W.A., and Goolsby, D.A., 1995, Spatial data in geographic information system format on agricultural chemical use, land use, and cropping practices in the United States: U.S. Geological Survey Water- Resources Investigations Report 94-4176, 87 p.

Brady, J.F., 1995, Interpretation of immunoassay data, in Nelson, J.O., Karu, A.E., and Wong, R.B., eds., Immu- noanalysis of agrochemicals: York, Pennsylvania, Maple Press, chap. 19, p. 266-287.

Butler, G.L., Deason, T.R., and O'Kelley, J.C., 1975, Loss of five pesticides from cultures on twenty-one planktonic algae: Bulletin of Environmental Contamination and Toxicology, v. 13, no. 2, p. 149-152.

Dries, D., De Corte, B., Liessens, J., Steurbaut, W., Dejon- ckheere, W., and Verstraete, W., 1987, Recalcitrance of atrazine at low levels to aerobic and hydrogenotrophic micro-organisms: Biotechnical Letters, v. 9, no. 11, p. 811-816.

Fishman, M.J., and Friedman, L.C., 1989, Methods fordetermination of inorganic substances in water and flu vial sediments: U.S. Geological Survey Techniques of Water-Resources Investigations, book 5, chap. Al, 545 p.

Geller, A., 1980, Studies on the degradation of atrazine by bacterial communities enriched from various biotopes: Archives of Environmental Contamination and Toxicology, v. 9, no. 3, p. 289-305.

Gianessi, L.P., and Puffer, C.M., 1991, Herbicides use in the United States National summary report, revised April 1991: Washington, D.C., Resources for the Future, 128 p.

Golcjlberg, M.C., Cunningham, K.M., and Squillace, P.J., 1991, Photolytic degradation of atrazine in the Cedar River, Iowa, and its tributaries, in Mallard, G.E., Aron- son, D.A., eds., U.S. Geological Survey Toxic Sub stances Hydrology Program Proceedings of the Technical Meeting, Monterey, Calif., March 11-15, 1991: U.S. Geological Survey Water-Resources Inves tigations Report 91^1034, p. 232-239.

Goo^sby, D.A., and Battaglin, W.A., 1995, Occurrence and | distribution of pesticides in rivers of the Midwestern United States, in Leng, M.L., Leovey, E.M., and Zubkoff, PL., eds., Agrochemical environmental fate: iBoca Raton, Fla., CRC Press, p. 159-173.

Goojsby, D.A., Boyer, L.L., and Mallard, G.E., eds., 1993, Selected papers on agricultural chemicals in water resources of the midcontinental United States: U.S. Geological Survey Open-File Report 93^18, 89 p.

Goojsby, D.A., Scribner, E.A., Thurman, E.M., Meyer, M.T., and Pomes, M.L., 1995, Data on selected herbi cides and two triazine metabolites in precipitation of the midwestern and northeastern United States, 1990- 91: U.S. Geological Survey Open-File Report 95^69, 341 p.

Jone(s, T.W., Kemp, W.M., Stevenson, J.C., and Means, J.C., 1982, Degradation of atrazine in estuarine water/sedi ment systems and soils: Journal of Environmental Quality, v. 11, no. 4, p. 632-638.

Jonek T.W., and Winchell, L., 1984, Uptake and photosyn- thetic inhibition by atrazine and its degradation prod ucts on four species of submerged vascular plants: Journal of Environmental Quality, v. 13, no. 2, p. 243-247.

Kolpin, D.W, Burkart, M.R., and Thurman, E.M., 1993, Hydrogeologic, water-quality and land-use data for the reconnaissance of herbicides and nitrate in near-sur face aquifers of the midcontinental United States: U.S. Geological Survey Open-File Report 93-114, 61 p.

Kolpin, D.W, and Kalkhoff, S.J., 1993, Atrazine degrada tion in a small stream in Iowa: Environmental Science and Technology, v. 27, no. 1, p. 134-139.

14 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993

100°

90°

Wisconsin! Late April through

/ mid-May 1992

' South Dakota ~ ~~^ ~ '

Base from U.S. Geological Survey digital survey. 1:2,000.000. 1972Albers Equal-Area Conic projectionStandard parallels 39°30' and 43°30'. central meridian -90°30'

100°

90°

EXPLANATIONNumber of herbicides or herbicide metabolites detected (14 possible)

O 0

© 1-4

O 5-8

O More than 8Solid black symbol indicates con centrations of one or more herbicides exceeded health-based limit

Late June through July 1992

, -) )- South Dakota ^ '

Base from U.S. Geological Survey digital survey. 1:2.000,000, 1972Albers Equal-Area Conic projectionStandard parallels 39°30' and 43°30'. central meridian -90°30'

200 MILES

200 KILOMETERS

Figure 2. Distribution of herbicide detections in selected Midwestern reservoirs and reservoirs in which one or more herbicides exceeded U.S. Environmental Protection Agency Maximum Contaminant Levels or Health Advisory Levels for drinking water during late April through mid-May and late June through early July 1992.

References Cited 15

100

10

1.0

CD

fcO-10CL V)ECD

D)

o 0.01

c 100

c gTO

Concent_ * o

1.0

0.10

0.01

A. Alachlor

-

i

s

-I I I ! i

-

t i

\^

9

IReporting limit

B. Alachlor ethane sulfonic acid

!

i ' j-

jy/ledian. ____ - - __

Reporting limit

1

-- ..-

April July Sept. Nov. Jan. 1992

I « :

^^^^. .

Mar. July Sept. 1993

EXPLANATION

; Maximum

i 95th percentile

i-L-i 75th percentile

- P

T:Median

J5th percent!

Minimum

Je

Figure 3. Boxplots showing the concentrations of (A) alachlor, (6) alachlor ethane sulfonic acid, (C) atrazine, (D) cyanazine, and (£) metolachlor during eight sampling periods in 1992-93.


100

10

1.0

0.10

0.01

100

I I C. Atrazine

Reporting limit

£CDO> Ob£ 1.0

0.10

c o O

0.01

100

10

1.0

0.10

0.01

D. Cyanazine

Reporting limit

I I TE. Metolachlor

Reporting limit

April July Sept. 1992

Nov. Jan. Mar. July 1993

Sept.

Figure 3. Boxplots showing the concentrations of (A) alachlor, (B) alachlor ethane sulfonic acid, (C) atrazine, (O) cyanazine, and (£) metolachlor during eight sampling periods in 1992-93 Continued.

References Cited 17

Meyer, M.T., 1994, Geochemistry of cyanazine and its metabolites Indicators of contaminant transport in surface water of the Midwestern United States: Lawrence, University of Kansas, Department of Geol ogy, Ph.D. Thesis, 364 p.

Meyer, M.T., Mills, M.S., and Thurman, E.M., 1993, Auto mated solid-phase extraction of herbicides from water for gas chromatographic-mass spectrometric analysis: Journal of Chromatography, v. 629, p. 55-59.

Paris, D.F., and Lewis, D.L., 1973, Chemical and microbial degradation of ten selected pesticides in aquatic sys tems: Residue Reviews, v. 45, p. 95-124.

Pelizzetti, E., and Tosato, J.L., 1990, Photocatalytic degra dation of atrazine and other s-triazine herbicides: Environmental Science and Technology, v. 24, no. 10, p. 1559-1565.

Pereira, W.E., and Rostad, C.E., 1990, Occurrence, distribu tion, and transport of herbicides and their degradation products in the lower Mississippi River and its tributar ies: Journal of Environmental Science and Technol ogy, v. 24, p. 1400-1406.

Plimmer, J.R., 1990, Pesticide loss to the atmosphere: American Journal of Industrial Medicine, v. 18, p. 451-^66.

Ruddy, B.C., and Hitt, K.J., 1990, Summary of selected characteristics of large reservoirs in the United States and Puerto Rico, 1988: U.S. Geological Survey Open- File Report 90-163, 295 p.

Scribner, E.A., Goolsby, D.A., Thurman, E.M., Meyer, M.T., and Pomes, M.L., 1994, Concentrations of selected herbicides, two triazine metabolites, and nutri ents in storm runoff from nine stream basins in the Midwestern United States, 1990-92: U.S. Geological Survey Open-File Report 94-396, 144 p.

Scribner, E.A., Thurman, E.M., Goolsby, D.A., Meyer, M.T., Mills, M.S., and Pomes, M.L., 1993, Reconnais sance data for selected herbicides, two atrazine metab olites, and nitrate in surface water of the Midwestern United States, 1989-90: U.S. Geological Survey Open-File Report 93-^57, 77 p.

Stamer, J.K., Gunderson, K.D., and Ryan, B.J., 1995, Atra zine concentrations in the Delaware River, Kansas: U.S. Geological Survey Fact Sheet FS-001-94, 2 p.

Stamer, J.K., and Zelt, R.B., 1992, Distribution of atrazine and similar nitrogen containing herbicides, lower Kan sas River basin: U.S. Geological Survey Yearbook, Fiscal Year 1991, p. 76-79.

Thurman, E.M., Goolsby, D.A., Aga, D.S., Pomes, M.L., and Meyer, M.T., 1996, Occurrence of alachlor and its sulfonated metabolite in rivers and reservoirs of the

I midwestern U.S. The importance of sulfonation in the transport of chloroacetanilide herbicides: Environ mental Science and Technology, v. 30, no. 2, p. 569-574.

Trjurman, E.M., Goolsby, D.A., Meyer, M.T., and Kolpin, D.W., 1991, Herbicides in surface waters of the Mid western United States The effect of spring flush: Environmental Science and Technology, v. 25, p. 1794-1796.

1992, A reconnaissance study of herbicides and their metabolites in surface water of the Midwestern United States using immunoassay and gas chromatography/mass spectrometry: Environmental Science and Technology, v. 26, p. 2440-2447.

Thurman, E.M., Meyer, Michael, Pomes, Michael, Perry, C.A., and Schwab, A.P., 1990, Enzyme-linked immunosorbent assay compared with gas chromatography/mass spectrometry for the determination of triazine herbicides in water: Analytical Chemistry, v. 62, p. 2043-2048.

U.S. Department of Commerce, 1989a, Census of agricul ture, 1987 Final county file: U.S. Department of Commerce, Bureau of the Census [machine-readable data file].

1989b, Census of agriculture, 1987 Final county file technical documentation: U.S. Department of Commerce, Bureau of the Census, Data User Services Division, various pagination.

U.S. Environmental Protection Agency, 1992, Drinking water regulations and health advisories: Washington, D.C., U.S. Environmental Protection Agency, 11 p.

Ward, J.R., and Harr, C.A., 1990, Methods for collection and processing of surface-water and bed-material sam ples for physical and chemical analyses: U.S. Geolog ical Survey Open-File Report 90-140, 71 p.


Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993

[-, data not available]

Date of collection

Map no. (month/ (fig. 1) Reservoir name year)

1 Carlyle Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

2 Crab Orchard Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

Evapor- - Volume ation

(acre-feet) (acre-feet)Illinois

292,994296,514287,965283,941280,170

283,690270,380270,380270,380270,380

270,380278,982374,616359,964307,914

419,306368,925530,578

61,49061,49061,49061,49061,490

61,49061,49061,49061,49061,490

Discharge

Inflow Outflow (acre-feet) (acre-feet)

75,45121,67926,00340,12672,972

23,1673,729

97,071287,861394,950

364,300280,640208,483180,476

78,783 119,861

150,169 25,09173,924 112,483

308,112 111,868

2,3564,744

..

6152,1829,906

21,31961,323

- Stage (feet above datum)

445.51445.65445.31445.15445.00

445.14 -

__

444.95448.47448.02446.08

449.93448.29453.10

~~ -

---~

Reservoir Measurements, April 1992 Through September 1993 19

Table 4. Reservoir volume, evaporation, discharge, and stage measurements, April 1992 through September 1993 Continued

Map no.Reservoir name

Date ofcollection Evapor- (month/ Volume ation

year) (acre-feet) (acre-feet)

Discharge

Inflow (acre-feet)

Outflow (acre-feet)

Stage (feet above datum)

2 Crab Orchard Lake Continued

Illinois Continued

02/93 61,490 03/93 61,490 04/93 61,490 05/93 61,490 06/93 61,490

6,35358,56138,60926,74122,051

07/93 08/93 09/93

61,49061,49061,490

1,457220

19,252

Devils Kitchen Lake 04/92 05/92 06/92 07/92 08/92

24,47024,47024,470

24,47024,470

1,4882,312

09/92 10/92 11/92 12/92 01/93

24,47024,47024,47024,47024,470

3101,2004,2635,239

02/93 03/93 04/93 05/93 06/93

24,47024,47024,47024,470

24,470

1,3896,9948,3062,5065,100

07/93 08/93 09/93

24,47024,47024,470

Lake Decatur 04/92 05/92 06/92 07/92 08/92

18,80018,80018,80018,80018,800

34,84611,6048,352

87,03916,378



Date of collection


4 Lake Decatur Continued 09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

5 Lake Shelbyville 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93


(acre-feet) (acre-feet)Illinois Continued

18,80018,80018,80018,80018,800

18,80018,80018,80018,80018,800

18,80018,80018,800

201,302208,078209,826252,991234,485

212,056209,790209,790209,790209,790

209,790202,554254,628223,641234,248

309,223290,578369,322

Discharge


1,0193,608

164,47765,841

184,036

30,294131,728182,98765,02663,715

97,73417,92779,835

4,14510,55224,21840,62183,980

21,2831,230

49,944190,810212,990

160,110109,488

97,11177,970

44,152 28,271

96,456 17,99018,486 34,612

129,520 31,380


_-------

--------

__--~

599.13599.75599.91603.55602.05

600.11--------

_

599.26603.67601.13601.98

607.65606.33611.50



Date of collection

Map no. (month/ Volume (fig. 1) Reservoir name year) (acre-feet) (i

DischargeEvapor- ......._

ation Inflow icre-feet) (acre-feet)

Outflow (acre-feet)


Illinois Continued

6 Lake Vermillion 04/92 9,20805/92 9,20806/92 9,20807/92 9,20808/92 9,208

09/92 9,20810/92 9,20811/92 9,20812/92 9,20801/93 9,208

02/93 9,20803/93 9,20804/93 9,20805/93 9,20806/93 9,208

07/93 9,20808/93 9,20809/93 9,208

7 Little Grassy Lake 04/92 23,69005/92 23,69006/92 23,69007/92 23,69008/92 23,690

09/92 23,69010/92 23,69011/92 23,69012/92 23,69001/93 23,690

02/93 23,69003/93 23,69004/93 23,69005/93 23,69006/93 23,690

----------

2,8174,903

69,12220,55280,723

12,33153,441

--~

_.---

_.----~

__--~--~

--..--_.

17,9035,960

13,34531,05510,881

2,9404,752

76,60420,33558,659

11,88958,65362,68821,14833,025

83,1299,644

30,444

372922

---~

3361,3014,6225,680

1,5067,5838,9712,7055,505

-------~

-----~

------~

---

------~

------

-----~



Date of collection


7 Little Grassy Lake 07/93Continued 08/93

09/93

8 Rend Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

9 Brookville Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92


(acre-feet) (acre-feet)Illinois Continued

23,69023,69023,690

232,040218,445201,237188,396178,744

177,865183,330183,330183,300183,300

183,300261,941274,000250,000240,585

238,170216,690244,755

Indiana

154,000186,000185,000184,000186,000

185,000185,000174,000145,500145,000

Discharge


_..-

19,97417,71210,5724,8202,241

1,7851,8471,7851,847

26,360

31,18050,82050,18247,484

7,660 25,785

26,995 23,6637,458 17,653

49,587 15,293

2,6804,980

19,10036,09056,760

11,4807,150

17,12065,89019,630


_----

407.57406.90406.02405.33404.80

404.75-------

_

409.02409.66408.55407.90

407.60406.60407.90

742.13748.52748.34748.07748.55

748.38748.21746.19741.02740.37




Date ofcollection(month/

year)

Evapor-Volume ation

(acre-feet) (acre-feet)

Discharge

Inflow (acre-feet)

Outflow (acre-feet)


9 Brookville Lake Continued

Indiana Continued

01/93 145,000 02/93 145,000 03/93 164,000 04/93 185,000 05/93 185,000

52,72018,60038,74044,06036,980

740.45740.59744.11

06/93 07/93 08/93 09/93

185,000184,000184,000185,000

43,56024,8502,4007,080

10 Cataract Lake 03/92 04/92 05/92 06/92 07/92

08/92 09/92 10/92 11/92 12/92

28,00060,00029,30029,30049,100

29,30029,30028,00075,50031,500

10,26025,91038,6604,350

19,370

37,6904,3004,590

22,96063,510

636.98654.66637.58637.59649.03

637.44637.55636.98661.63639.01

01/93 02/93 03/93 04/93 05/93

47,10027,00030,00034,00029,000

40,76038,06040,12042,89026,920

648.90636.07638.27

06/93 07/93 08/93 09/93

29,00029,00073,00057,000

28,20010,44039,53048,070

11 Eagle Creek Reservoir 03/92 04/92 05/92 06/92 07/92

22,25622,20022,35922,96123,018

4,63026,2202,7403,120

15,690

24 Concentrations of Selected Herbicides, Herbicide Metabolites, and Mutrients in Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993


Date of collection


11 Eagle Creek Reservoir 08/92 Continued 09/92

10/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

12 Huntington Lake 03/92 04/9205/9206/9?07/9

08/09/9210/9211/9212/92

01/9302/9303/9304/9305/93


(acre-feet) (acre-feet)Indiana Continued

22,018 22,13121,91522,08621,495

20,70021,13120,75621,73322,666

22,78022,57522,39322,757

4,650 12,00013,00013,00020,000

13,00010,0007,000

10,0005,500

4,6005,2006,000

13,20012,600

Discharge


2,230 10,6104,510

50,6207,950

38,0706,480

28,80023,50010,690

6,64018,820

1,4005,300

24,540 64,100

8,59027,02091,890

32,89059,25027,160

141,30024,860

110,8002 1 ,940

125,50089,43017,060


--

-----

------~

--...~

738.10 748.67749.61749.14756.21

749.17746.67742.22745.62739.92

738.08739.40740.49

----



Map no. (fig. 1) Reservoir name

12 Huntington Lake Continued

13 Lake Shafer

14 Mansfield Lake

15 Mississinewa Lake

Date of collection (month/

year)

06/9307/9308/9309/93

-

03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

03/9204/9205/9206/9207/92



18,20015,10012,60011,200

--

29,40053,50051,40051,40058,000

51,40056,00036,000

101,00031,000

51,40016,20031,00052,00051,000

52,00051,00052,00051,000

49,00097,00075,00075,000

133,000

Discharge


30,750153,400

14,6906,750

--

1,3407,6206,5502,1407,720

12,20017,29030,3806,780

74,940

31,63041,17017,77010,94011,240

12,45020,2906,440

10,260

20,06047,45039,55077,320

114,500


_----~

-

650.05663.35662.37662.05665.30

662.29664.52654.21681.02651.75

662.42640.69651.66

--~

727.41743.42737.18737.21751.27



Date of collection


15 Mississinewa Lake 08/92Continued 09/92

10/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

16 Monroe Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93



75,00051,00049,000

224,000101,000

24,60023,30051,00080,00076,000

80,00075,00075,00075,000

182,000205,000193,000182,000193,000

182,000170,000170,000190,000182,000

216,000193,000200,000211,000182,000

Discharge


94,23077,54025,640

6,830157,000

209,00027,310

107,20069,08041,790

50,030131,200

11,86016,780

14,68012,51017,37011,26011,410

19,4504,5303,4409,500

14,070

32,70048,89068,75072,01054,940


737.17728.24727.20765.08744.20

713.02712.12728.26

----

__-----

538.41540.26539.05538.03539.44

538.23537.83537.59538.95538.30

541.10539.25539.91

--~




Date of Dischargecollection Evapor-

(month/ Volume ation Inflowyear) (acre-feet) (acre-feet) (acre-feet)

Outflow (acre-feet)


16 Monroe Lake ContinuedIndiana Continued

06/93 184,00007/93 180,00008/93 192,00009/93 193,000

13,7508,180

13,34024,990

17 Morse Reservoir

18 PatokaLake

03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

03/9204/9205/9206/9207/92

21,36721,41621,29321,28122,478

21,17121,40421,28121,52721,616

21,44121,37921,46521,53921,404

21,55121,30621,15821,342

162,000170,000170,000168,000165,000

7,94630,6884,619

27,84330,335

10,89811,4788,280

65,9249,790

43,1456,773

38,22629,80413,826

9,07234,0332,2444,017

1,5601,5501,6001,5501,600

534.65535.33535.29534.96534.70



Date of collection


18 Patoka Lake Continued 08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

19 Salamonie Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93



162,000161,000153,000153,000153,000

162,000155,000170,000187,000192,000

194,000186,000179,000183,000

32,50067,00054,50054,50082,000

54,50054,50036,000

114,00012,500

13,00011,30040,00056,00055,000

60,00082,00055,00050,000

Discharge


1,6001,5501,5601,4901,540

11,15021,90014,69021,90010,910

7,4707,6903,2901,740

15,40028,25021,34026,29039,780

42,04041,99037,90059,340

132,800

97,74016,46064,67061,81022,710

37,48080,99031,43016,490


534.34534.01533.45533.51533.43

534.47533.74535.10

~-

~-~

745.56759.97755.41755.08763.83

755.20755.23747.67771.81731.73

732.21730.21749.33

~--

~-~



Date of collection


20 Coralville Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

21 Lake Panorama 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

Evapor- Volume ation

(acre-feet) (acre-feet)Iowa

26,90029,40029,60044,10097,100

44,40065,10065,020

125,61044,610

43,95426,99596,678

396,000278,000

448,000478,000378,00096,100

14,35014,40014,40014,30014,500

14,00014,40014,20014,50014,300

Discharge

Inflow (acre-feet)

253,310239,650184,72084,890

259,060

224,22087,44055,160

217,530190,870

117,50384,888

440,605673,000377,300

538,6001,206,000

940,400470,100

14,63020,67014,6507,690

14,420

8,69010,74010,75024,37022,913

Outflow (acre-feet)

252,520241,130184,05069,290

203,230

257,88067,58051,350

165,090271,180

115,61899,552

405,199462,700574,800

428,6001,276,0001,138,000

776,600

16,26019,63012,7408,050

12,500

10,27017,30011,29022,89023,820


679.44680.15679.36683.31690.58

683.36686.41686.36693.14683.44

683.29679.39690.35709.23703.50

711.43712.65708.38690.22

45.4845.5245.5445.4645.69

45.0145.5245.2845.6145.30



Date of collection


21 Lake Panorama Continued 01/9302/9303/9304/9305/93

06/9307/9308/9309/93

22 Lake Red Rock 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

23 Rathbun Lake 03/9204/9205/9206/9207/92


(acre-feet) (acre-feet)Iowa Continued

14,30014,30014,30014,30014,250

14,40014,30014,20014,500

245,000381,000272,000271,000343,000

271,000327,000156,320184,381137,313

272,553271,184346,616

1,040,0001,440,000

1,670,0001,230,000

584,000223,000

201,358 738289,669 1,622244,752 3,043209,872 4,750245,376 2,848

Discharge

Inflow (acre-feet)

11,0008,600

62,05039,83046,380

43,110163,10041,41027,750

881,310948,990569,240334,100646,940

464,420368,440283,560723,680665,860

237,544213,920

1,066,0521,849,0002,065,000

1,828,0004,414,0002,102,0001,597,000

15,679102,734

3,5601,636

58,443

Outflow (acre-feet)

11,0808,600

59,53038,97048,300

44,590167,90037,20025,540

938,670820,550671,750334,460586,320

521,380407,500307,080670,440766,860

239,428215,684970,864

1,255,0001,753,000

1,670,0004,878,0002,743,0001,993,000

18,37312,80245,43231,76620,094


45.3445.3345.2945.4145.35

45.5245.4345.2245.62

740.88747.70742.32742.32745.26

742.27745.41744.28746.72742.35

742.36742.29745.93767.00774.85

778.68770.90754.84739.80

904.14911.25907.84904.90907.89



Date of collection


23 Rathbun Lake Continued 08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

24 Saylorville Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

Volume (acre-feet)

Evapor ation

(acre-feet)Iowa Continued

215,680 3,586457,709397,491417,836387,975

307,677249,002251,515263,000294,000

289,000559,000479,000394,000

89,10095,60089,00090,10090,100

89,700100,000103,00089,20088,662

88,60388,70299,720

567,000339,000

635,000537,000461,000139,000

5,4155,2963,1381,402

791639904

1,5272,340

i 2,9694,5846,1395,040

-~

-_

---_--

__~

Discharge

Inflow (acre-feet)

25,527290,221

2,13258,36452,106

13,57726,04380,85678,01073,269

35,772317,008

36,58520,936

544,411429,050265,430210,050379,210

242,260101,00037,860

357,230240,540

88,42462,032

343,3781,310,000

827,300

1,268,0001,676,000

830,300449,000

Outflow (acre-feet)

51,63042,77657,19034,88080,570

93,08484,08477,43767,37042,150

37,74044,040

112,300101,600

555,201410,803260,950207,200388,940

230,740102,21040,260

338,540208,270

95,02961,320

360,6201,058,0001,117,000

1,051,0002,018,000

949,100800,400


905.41921.57918.21919.38917.65

912.52908.18908.38909.25911.58

911.23926.66922.70917.99

836.43837.50836.39836.59836.56

836.52838.33838.70841.81836.37

836.29836.31851.23883.99866.30

887.92882.03876.56843.80



Date of collection


25 Clinton Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

26 Hillsdale Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

Volume (acre-feet)

Kansas

145,000142,800133,800137,400134,900

133,500130,767142,562128,936135,883

130,060138,341171,948168,509138,633

226,947167,798172,029

74,54073,16072,94075,95073,960

73,60072,48897,95694,47279,558

71,65673,54982,37187,24773,326

Evapor- - ation

(acre-feet)

9421,4961,7122,7533,396

3,3662,4851,012

615377

284434809

1,3732,033

3,0374,5943,197

506928

1,0931,9561,900

2,1801,7411,029

458268

194248518869

1,373

Discharge

Inflow (acre-feet)

9,4212,7519,612

18,5433,078

3,6401,507

33,16440,94917,940

19,37930,41787,243

101,88113,339

93,60014,34044,380

8,1521,0712,2126,545

873

2,156823

26,67828,53212,119

4,93913,95418,10933,699

7,765

Outflow (acre-feet)

6384,126

16,35212,495

1,910

1,9071,291

19,85453,49210,171

24,50321,23552,355

103,39840,679

1,79368,31336,385

8091,5801,4901,4901,190

98184179

31,55926,762

12,65111,8118,768

27,94620,311


877.70877.40876.16876.66876.31

876.11875.73877.37875.47876.45

875.63876.79881.20880.77876.83

887.57880.68881.21

916.62916.31916.26916.93916.49

916.41916.16921.34920.69917.71

915.97916.40918.30919.29916.35



Date of collection


Volume (acre-feet)

Evapor- - ation

(acre-feet)

Discharge

Inflow (acre-feet)

Outflow (acre-feet)


Kansas Continued

26 Hillsdale Lake Continued 07/9308/9309/93

27 Kanopolis Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

28 Milford Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

129,22586,997

119,927

53,32052,38075,070

100,40068,450

49,40049,13752,55258,50950,748

55,08176,64468,25296,09794,390

339,984171,72381,265

323,000324,400354,800448,300397,700

406,000440,984440,633354,877359,666

2,4423,2852,368

7081,0711,2932,5192,678

2,0931,212

730456270

266444887

1,5612,013

4,6955,0002,896

1,8353,5173,8908,8969,142

10,1757,2973,1661,337

944

59,8215,246

38,291

1,1821,946

31,64652,01851,642

6,0147,9425,222

10,9987,192

74,186106,95154,48493,36850,908

391,01365,35353,244

13,5076,744

35,831222,306119,236

47,46476,64144,14266,46627,838

1,48244,188

2,987

1,3001,6108,340

26,56083,540

20,1101,5991,0774,586

14,684

69,58884,94361,98863,96250,600

140,723228,615140,807

1,8301,7602,230

129,400149,700

26,69034,16541,331

150,88422,099

926.60919.24925.13

1,462.291,462.011,467.771,472.801,466.26

1,461.101,462.901,463.901,465.501,463.38

1,464.601,469.621,467.821,473.311,473.00

1,501.901,484.681,470.55

1,139.901,140.001,142.141,147.951,144.96

1,145.471,147.541,147.521,142.151,142.48

34 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrient* In Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993


Date of collection


28 Milford Lake Continued 02/9303/9304/9305/9306/93

07/9308/9309/93

29 Perry Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

30 Pomona Lake 04/9205/9206/9207/9208/92

Volume (acre-feet)

Evapor- atlon

(acre-feet)Kansas Continued

367,048 801398,819433,666430,225484,132

1,244,586646,134448,246

238,200234,800234,200311,900231,600

240,900243,423259,618188,076191,747

188,284205,602238,114274,083245,177

693,404243,548315,296

77,93072,53071,74069,97065,880

9242,0414,0505,720

14,36017,9608,616

1,5492,6063,1345,6555,964

6,7124,5061,769

980504

450623

1,6382,7793,517

8,9599,9315,270

500873

1,0692,0191,745

Discharge

Inflow (acre-feet)

135,124247,309154,611216,853159,273

1,331,672249,838179,901

73,21012,83312,506

164,17122,354

61,4588,281

94,93992,18228,850

53,81257,164

221,712266,18248,893

527,42536,65586,787

14,8361,0006,942

26,3703,838

Outflow (acre-feet)

126,938214,609117,727216,24299,640

556,863830,340369,163

59,44013,4409,050

82,31090,350

44,8301,537

76,970162,74224,678

56,82439,225

187,559227,42574,285

70,243476,570

9,761

9,7306,6805,770

23,7005,360


1,142.981,145.031,147.121,146.921,149.93

1,179.121,157.881,147.95

893.96893.68893.63899.40893.42

894.18894.39895.66889.53889.88

889.55891.15893.96896.74894.53

919.32894.40899.64

977.38976.07975.88975.45974.43



Date of collection


30 Pomona Lake 09/92Continued 10/92

11/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

31 Tuttle Creek Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

Volume (acre-feet)

Kansas Contin

64,02062,10888,45780,60871,391

58,07769,85273,05490,14072,604

162,53787,60284,766

425,600434,200438,800860,300437,800

455,400392,401412,071300,869300,381

299,647357,889424,446691,683694,295

2,122,626945,624393,329

Evapor ation

(acre-feet)lied

2,0731,575

859393208 .

167246436839

1,321

2,4223,4312,019

1,6583,3043,3187,8219,231

9,0905,1712,3461,139

633

565859

2,1123,9775,675

18,01221,362

8,834

Discharge

Inflow (acre-feet)

1,200516

28,09634,97814,539

17,32627,61054,10992,063

6,268

93,7885,008

15,273

64,64145,838

101,117895,872265,870

138,922105,967136,135143,24661,121

293,911695,504492,178673,348494,598

2,584,719280,522343,993

Outflow (acre-feet)

998922893

42,43423,548

30,47315,59050,47574,13522,479

1,43676,51016,090

27,50035,10099,180

494,300670,600

105,500103,124114,116253,306

60,975

294,078636,405423,512402,125486,327

1,138,3791,436,155

887,438


973.95973.46979.67977.95975.80

972.37975.43976.20980.02976.09

992.70979.49978.88

1,077.381,077.911,078.191,098.251,078.13

1,079.181,079.031,080.271,072.321,072.28

1,072.221,076.671,081.021,094.211,094.32

1,133.461,103.881,079.09



Date of Map collection no. (month/

(fig. 1) Reservoir name year)

32 Waconda Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

33 Wilson Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

Volume (acre-feet)

Evapor- - ation

(acre-feet)Kansas Continued

187,300 1,958185,000223,500258,500239,300

233,700236,663235,915242,610239,681

278,073349,683301,704275,906315,459

918,222846,307737,842

191,200189,100198,600213,100227,600

227,000227,161228,368231,324234,585

257,891268,354253,470263,771268,162

3,9633,6735,9786,847

7,2224,6232,8131,214

952

8051,5713,0093,6505,899

10,73117,26413,063

1,7592,9122,3864,2514,278

4,6373,0721,9461,045

676

5491,0251,8112,5904,058

Discharge

Inflow (acre-feet)

6,2002,366

43,67844,46726,640

6,21212,0326,230

14,4147,246

60,010157,18052,47951,19197,442

657,580140,02591,420

1,2711,702

12,78919,37420,099

5,0143,4023,4514,3104,245

29,51858,80435,76238,20635,879

Outflow (acre-feet)

893922870

2,30240,211

4,8604,3044,1656,5059,223

20,81283,99997,44873,34051,991

44,085194,678186,823

9841,0401,0001,1001,160

1,180327298307307

5,66346,32248,83525,31327,429

Stage (feet

above datum)

1,450.931,450.711,454.141,456.931,455.43

1,454.981,455.231,455.171,455.701,455.47

1,458.391,463.201,460.061,458.231,461.00

1,486.931,484.651,480.95

1,509.901,509.631,510.831,512.611,514.32

1,514.251,514.271,514.411,514.751,515.12

1,517.671,518.771,517.201,518.291,518.75





33 Wilson Lake Continued 07/9308/9309/93

34 Cross Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

35 Gull Lake Reservoir 01/9202/9203/9204/9205/92

06/9207/9208/9209/9210/92

Evapor- - Volume atlon

(acre-feet) (acre-feet)Kansas Continued

654,695 i 6,573629,706 9,370572,459 6,918Minnesota

10,15610,15610,15610,15610,156

10,15610,15610,15610,15610,156

10,15610,15610,15610,15610,156

10,15610,15610,15610,156

49,08050,76857,63461,93861,153

61,15360,50161,28457,11055,810

Discharge


394,030 92247,903 63,52133,898 84,224

99,07097,48036,57011,47016,750

7,6008,4107,420

13,5608,440

6,3905,510

14,25075,23050,240

77,32066,45018,81020,420

6,5181,9563,3826,1895,472

5,5935,4721,2304,5821,107

Stage (feet

above datum)

1,547.731,546.291,542.83

------

----

----

---

1,193.081,193.211,193.741,194.071,194.01

1,194.011,193.961,194.021,193.701,193.60

38 Concentrations of Selected Herbicides, Herbicide Metabolites, and Nutrients In Outflow from Selected Midwestern Reservoirs, April 1992 Through September 1993 !


Map no.

(fig. 1) Reservoir name

35 Gulf Lake Reservoir Continued

36 Lac Qui Parle Reservoir


year)

11/9212/9201/9302/9303/93

04/9305/9306/9307/9308/93

09/93

01/9202/9203/9204/9205/92

06/9207/9208/9209/9210/92

11/9212/9201/9302/9303/93

04/9305/9306/9307/9308/93

Evapor- - Volume atlon

(acre-feet) (acre-feet)Minnesota Continued

56,85154,90754,00351,41955,036

58,15964,55162,02160,89162,331

60,501

46,32539,18041,45037,88040,740

86,53559,55046,62544,75049,520

46,17545,65045,35034,69558,530

67,21069,015

112,750118,62556,660

Discharge


1,9646,3956,2606,0423,499

9,08810,31119,12711,9693,376

3,207

16,47921,11078,582

. 63,31341,628

163,996146,95842,79619,9947,194

22,13617,0948,522

15,08029,523

273,400186,000185,100430,900372,000

Stage (feet

above datum)

1,193.681,193.531,193.461,193.261,193.54

1,193.781,194.271,194.001,193.991,194.10

1,193.96

933.71932.72933.06932.52932.96

938.09935.30933.75933.50934.12

933.69933.62933.58932.03935.18

936.18936.37940.30940.77934.96

09/93 58,105 92,426 935.13





37 Leech Lake Reservoir 01/9202/9203/9204/9205/92

06/9207/9208/9209/9210/92

11/9212/9201/9302/9303/93

04/9305/9306/9307/9308/93

09/93

38 Pine River Reservoir 06/9207/9208/9209/9210/92

11/9212/9201/9302/9303/93



464,814453,937478,960514,243 !520,562

524,357547,114540,787530,684497,802

i 502,863506,643515,509509,178499,067 '

566,092606,549607,814678,624 |622,183

601,488

102,310102,310103,124 !99,30695,801

95,52989,74986,94784,17786,947 i

Discharge


45,13327,15011,0686,1297,194

6,3087,3797,0718,569

12,421

11,90116,04815,9589,520

35,170

9,63733,51312,33052,97011,662

49,000

5,53414,8193,136

11,0085,780

6,96211,4989,2077,4845,892

Stage (feet

above datum)

1,293.731,293.631,293.861,294.151,294.20

1,294.231,294.411,294.361,294.281,294.02

1,294.061,294.09

-~~

1,294.561,294.881,294.891,295.45

~

1,294.84

1,229.391,229.391,229.451,229.171,228.91

1,228.891,228.461,228.251,228.041,228.25



Map no.


38 Pine River Reservoir Continued

39 Sandy Lake Reservoir

40 Winnibigoshish Reservoir


year)

04/9305/9306/9307/9308/93

09/93

01/9202/9203/9204/9205/92

06/9207/9208/9209/9210/92

11/9212/9201/9302/9303/93

04/9305/9306/9307/9308/93

09/93

01/9202/9203/9204/9205/92



100,394105,716101,487101,762102,036

100,667

44,60445,26851,27360,43061,629

62,38961,62963,62860,88657,753

56,30650,49946,27244,11548,694

62,67664,19963,05863,34262,772

62,389

618,467630,275662,431688,041687,384

Discharge


4,33621,11433,38347,81519,948

12,296

12,1134,602

24,34948,79429,084

18,14924,226

2,58311,3065,288

10,11613,8359,6985,3772,884

27,56133,51350,25052,97011,662

4,455

28,46915,41614,08114,99513,404

Stage (feet

above datum)

_~----

1,229.37

1,229.27

1,214.341,214.421,215.131,216.151,216.28

1,216.361,216.281,216.491,216.201,215.86

1,215.701,215.041,214.541,214.801,214.80

1,216.391,216.551,216.431,216.461,216.40

1,216.36

1,296.951,297.131,297.621,298.011,298.00






(acre-feet) (acre-feet)

Discharge

Inflow (acre-feet)

Minnesota Continued

40 Winnibigoshish 06/92 688,041 Reservoir Continued 07/92 709,053

08/9209/9210/92

11/9212/9201/9302/9303/93

04/93- 05/93

06/9307/9308/93

09/93

41 Harrisonville Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

716,273700,514667,682

646,672638,148630,275623,053627,645

659,800714,314709,711730,710710,368

690,670

Missouri

6,7276,5866,3386,2866,113

5,9285,7646,8796,8086,858

6,8086,8337,0967,1706,711

--~

~-~~

~~-~

-

143209218252202

196134584333

3975

138195212

~-~

----~

~~~-

~

1,160274232385229

178150

2,4864,0821,949

8131,2023,721

11,6269,245

Outflow (acre-feet)

6,843 17,27819,36931,71642,304

38,08337,26234,31026,43624,287

9,8186,149

33,91841,81258,168

39,263

1,131167151150150

138142

1,3054,1091,645

692807

2,94111,3578,958

Stage (feet

above datum)

1,298.01 1,298.331,298.441,298.201,297.70

1,297.381,297.251,297.131,297.021,297.09

1,297.581,298.411,298.341,298.661,298.17

1,298.05

9.318.968.468.207.75

7.276.839.689.519.63

9.519.57

10.2110.399.27

42 Concentrations of Selected Herbicides, Herbicide Metabolites, and N April 1992 Through September 1993

in Outflow from Selected Midwestern Reservoirs,


Date of Map collection no. (month/ Volume

(fig. 1) Reservoir name year) (acre-feet)

41 Harrisonville Lake 07/93Continued 08/93

09/93

42 Harry S Truman Reservoir 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

43 Long Branch Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

Evapor ation

(acre-feet)Missouri Continued

6,837 2136,5357,018

1,223,5731,286,1401,242,3501,234,3531,421,264

1,198,4071,219,0641,197,8562,353,9832,158,768

1,488,7191,260,2681,216,813

~

1,760,575

1,248,1074,294,3262,828,9023,690,813

35,93237,81535,06232,43637,073

33,07430,46029,18845,25439,394

224153

4,19110,96315,82418,68025,775

24,31928,55622,86725,76518,056

8,0594,3464,453

~

19,859

22,46145,32050,50342,117

184333526845674

750766770448236

Discharge

Inflow (acre-feet)

11,104341

5,923

237,698659,591115,368285,479

1,120,489

349,597197,940

1,159,3442,059,1392,453,671

1,351,656546,506946,770

--

1,837,288

633,9963,046,219

322,4631,992,931

6,2888,749

484204

9,144

9781,267

16124,46612,952

Outflow (acre-feet)

10,764286

5,185

242,004586,063143,333274,799907,804

548,140148,724114,282877,244

2,630,827

2,013,644770,610985,777

~

1,311,306

1,124,00533,197

1,737,3851,088,904

5,3056,5382,7101,9863,832

4,2263,115

6657,948

18,570

Stage (feet

above datum)

9.588.83

10.02

706.36707.44706.69706.55709.60

705.91706.28705.90720.71718.74

710.60707.00706.24

714.23

706.79734.88724.99731.27

791.71792.45791.36790.94792.16

790.54789.42788.85795.15793.05



Date of Map collection Evapor- no. (month/ Volume ation

(fig. 1) Reservoir name year) (acre-feet) (acre-feet)

43 Long Branch Lake 01/93Continued 02/93

03/9304/9305/93

06/9307/9308/9309/93

44 Mark Twain Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

45 Pomme de Terre Lake 03/9204/9205/9206/9207/92

Missouri Continued

37,583 13935,93339,765

--

40,679

37,63550,91538,57243,832

620,967642,631568,149542,329543,802

526,659496,405453,037693,477637,414

606,097565,428

--

767,391

720,6631,276,9041,005,2381,311,119

257,851258,101254,209242,773237,433

111186

~

522

599768998772

---~

----~

__-----

---~

6151,4682,1862,4872,862

Discharge

Inflow (acre-feet)

9,9174,066

19,091~

5,147

6,57555,19010,90920,172

113,371154,312

11,0684,046

40,959

21,5807,3591,527

266,182189,977

87,87021,260

320,688-

127,874

84,794736,509205,126757,677

17,22620,350

9,4217,567

19,557

Outflow (acre-feet)

11,5905,603

15,076~

10,200

5,60539,34122,25814,138

86,241124,12676,66122,67126,737

32,23131,69236,49627,947

243,421

187,14082,195

197,455~

331,239

113,000155,934475,736452,536

11,66118,62811,12416,51222,037

Stage (feet

above datum)

792.36791.71793.19

~

791.52

791.67797.01792.74794.66

----~

---~

__---

616.49

614.50633.90625.46634.86

841.55841.58841.11839.69839.01





45 Pomme de Terre Lake 08/92Continued 09/92

10/9212/9201/93

02/9303/93

46 Smithville Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

47 Stockton Lake 03/9204/9205/9206/9207/92

Volume (acre-feet) i

Evapor ation

(acre-feet)Missouri Continued

238,212 2,943238,056234,482308,806240,797

256,770262,380

146,611174,960148,001146,465176,575

139,473138,913107,775122,577137,866

110,913123,543142,029

~

167,836

151,926220,286146,983209,119

879,796905,457904,707927,209

1,009,004

3,5212,9911,791

859

613625

395795

1,4401,9443,150

3,2413,4412,178

845571

315280377

~

1,460

1,9243,1264,0462,924

1,8454,3426,4036,2949,005

Discharge

Inflow (acre-feet)

9,8686,5452,688

102,02067,835

23,02861,339

11,63332,350

1,4662,610

43,244

4,8047,0512,483

24,29833,263

11,08813,35919,359

~

49,111

9,30276,93912,66472,198

33,37250,28124,36753,573

184,640

Outflow (acre-feet)

6,1493,1783,074

116,963134,983

6,44055,103

7193,264

26,9852,202

12,986

35,6654,167

31,4458,650

17,404

37,725444492

~

43,784

23,2725,442

81,9327,129

28,58220,28118,71224,779

107,026

Stage (feet

above datum)

839.11839.09849.04847.30839.44

841.42842.09

864.89868.59865.08864.87868.42

863.90864.22860.31861.40863.67

859.54861.55864.26

--

867.70

865.62873.81864.94872.59

867.20868.23868.20869.09871.71



Date of Map collection Evapor- no. (month/ Volume ation


47 Stockton Lake 08/92Continued 09/92

10/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

48 Branched Oak Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

Missouri Continued

890,208 9,084849,239776,934

1,016,8131,113,898

977,135932,085958,542

944,515

990,1771,032,0511,011,6941,380,737

Nebraska

25,55725,76625,38225,55727,587

26,33826,04823,58524,07524,576

25,11926,57427,42426,99026,790

27,71330,36928,34627,823

9,8727,4449,5745,276

2,1401,5191,903

~

6,395

7,2589,279

12,18011,397

231453769789968

872725533297132

10298

182346422

674731693479

Discharge

Inflow (acre-feet)

43,08154,32716,750

262,145247,140

145,77566,426

138,010~

107,306

165,95779,07121,293

440,033

581662385964

4,858

2,7151,710

573787633

6451,9619,3173,7613,374

5,95218,6985,6075,304

Outflow (acre-feet)

139,60685,42081,60912,691

144,783

280,397109,954109,648

-

155,988

113,03427,92429,46759,591

0000

1,860

3,0921,2752,503

00

0404

7,9253,8483,152

4,35615,3136,9385,349

Stage (feet

above datum)

867.62865.95862.89872.49875.95

871.01869.28870.30

869.76

871.50873.05872.30884.48

1,283.751,283.871,283.651,283.751,284.88

1,284.191,284.031,282.611,282.901,283.19

1,283.501,284.321,284.791,284.551,284.44

1,284.951,286.361,285.291,285.01




(fig. 1) Reservoir name year)Volume

(acre-feet) |

Evapor- - ation

[acre-feet)Nebraska Continued

49 Calamus Reservoir 03/92 124,45104/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

50 Cunningham Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/93

125,108128,220122,640110,280

98,82081,40094,672

108,105108,520

108,427108,658125,362128,119128,067

126,786117,079107,28098,947

3,4223,5433,3913,2853,496

3,3013,2973,3283,3793,367

3,3633,3873,5623,523

1,5902,1801,6103,440

3,9103,5401,139

678411

449559

1,0391,7781,419

1,2491,6782,1191,292

51102172167210

1811511166829

22203771

Discharge

Inflow (acre-feet)

23,07020,22017,45018,54018,990

19,95019,41021,54419,83519,371

20,32819,18927,23824,60427,928

24,04130,55122,90120,248

7361,090

835355

1,242

466389486593453

421371

1,607946

Outflow (acre-feet)

7,26716,00011,77021,85031,190

33,33035,3507,1375,724

18,545

19,97218,3999,495

20,06926,561

24,07338,58030,58127,289

607867815294821

480242339474436

403327

1,392914

Stage - (feet

above datum)

2,243.422,243.552,244.162,243.062,240.50

2,237.952,233.672,236.982,240.032,240.12

2,240.102,240.152,243.602,244.142,244.13

2,243.882,241.932,239.852,237.98

1,121.411,121.721,121.331,121.061,121.60

1,121.101,121.091,121.171,121.301,121.27

1,121.261,121.321,121.771,121.67





EVolume

(acre-feet) (a

DischargeEvapor ation Inflow cre-feet) (acre-feet)

Nebraska Continued

50 Cunningham Lake 05/93 3,473 88 1,093Continued 06/93

07/9308/9309/93

51 Enders Reservoir 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

52 Harlan County Lake 03/9204/9205/9206/9207/92

3,556 140 1,5353,7233,6733,453

21,930

150 2,408141 1,05797 617

1,51022,850 -- 1,32023,090 -- 1,10023,820 -- 1,11018,060

16,52017,35018,36019,61020,910

22,28023,68025,26026,550

1,040

1,620982

1,1501,2701,300

1,5201,5401,8501,620

27,970 -- 1,770

27,85023,97020,34021,620

167,000

1,4401,7401,6901,280

11,080172,300 -- 8,730173,100 -- 3,870174,800 -- 5,477168,300 -- 5,253

Outflow (acre-feet)

1,0551,3112,093

964740

181741

1766,890

3,72022262322

2950819482

1,1105,8405,120

157

313157166

3,73914,484

Stage - (feet

above datum)

1,121.541,121.761,122.171,122.051,121.49

3,096.083,096.903,097.113,097.743,092.37

3,090.763,091.643,092.673,093.913,095.15

3,096.393,097.623,098.963,100.013,101.13

3,101.043,097.873,094.613,095.80

1,932.541,933.101,933.191,933.361,932.68



Date of Map collection Evapor- - no. (month/ Volume ation


52 Harlan County Lake 08/92Continued 09/92

10/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

53 Harry Strunk Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

Nebraska Continued

161,800160,400165,900170,900177,300

185,300201,000271,500291,200305,000

314,800397,800421,700409,000

28,87031,22032,75034,18029,790

29,62029,79031,86034,16034,800

35,16034,73034,27036,10038,030

39,42044,79038,85038,720

Discharge

Inflow (acre-feet)

13,8605,0105,7426,8485,930

6,72117,13362,00020,31814,788

11,99668,85036,00024,413

3,3302,7202,4402,4902,210

4,0902,0902,5302,7203,020

3,0703,8207,2803,5703,870

5,02014,5704,8004,300

Outflow (acre-feet)

20,2192,788

419253185

195159

1,440479451

8684,555

20,50534,490

292824

1,1505,930

4,1909524228

1,740

2,5604,590

10,7801,9501,710

4,19016,39010,7004,390

Stage (feet

above datum)

1,931.981,931.831,932.421,932.961,932.62

1,934.451,936.031,942.501,944.141,945.23

1,945.981,951.751,953.271,952.47

2,362.042,363.522,364.432,365.252,362.63

2,362.522,362.632,363.912,365.242,365.60

2,365.802,365.562,365.302,366.312,367.33

2,368.042,370.612,367.752,367.68






(acre-feet) (acre-feet)Nebraska Continued

54 Hugh Butler Lake 03/92 25,15004/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

55 Pawnee Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

25,59025,54025,96024,530

25,16024,22024,62025,27025,950

26,84028,20031,65032,57033,310

33,35035,88034,32034,860

7,0777,1347,0137,1768,034

7,744 !7,5757,1126,8657,041

----

_----

_----

_---

----

_----

_----

.---

98185303317385

35429621711653

Discharge

Inflow (acre-feet)

1,6901,0501,0601,3301,370

2,180861

1,0801,2401,180

8451,4103,5601,7201,700

1,4004,3801,8301,520

247242182480

1,279

278127516633229

Outflow (acre-feet)

236213214622

2,560

2,6901,310

236225245

245234260234253

7402,5602,300

891

0000

36

2140

762764

0

Stage - (feet

above datum)

2,572.882,573.242,573.202,573.542,572.37

2,572.892,572.112,572.442,572.982,573.53

2,574.252,575.302,577.822,578.452,578.95

2,578.982,580.622,579.622,579.97

1,243.261,243.341,243.171,243.401,244.58

1,244.191,243.961,243.311,242.961,243.21



Date of Map collection no. (month/ Volume

(fig. 1) Reservoir name year) (acre-feet)

55 Pawnee Lake Continued 01/9302/9303/9304/9305/93

06/9307/9308/9309/93

56 Swanson Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

57 Willow Creek Reservoir 03/9204/9205/9206/9207/92

Evapor- - ation

(acre-feet)Nebraska Continued

7,255 427,6038,0407,9417,971

8,1398,8358,9048,292

75,58081,07080,86082,94064,310

64,45064,20065,87069,75074,000

78,50086,05097,700

105,300111,800

111,40099,67092,72092,500

4,5804,8805,2305,1504,820

3870

135165

263292269188

~----~

--------

-------

----

-----

Discharge

Inflow (acre-feet)

256377

1,802516936

1,33910,4652,2791,579

10,6307,0002,3304,9901,920

7,6503,5102,9305,0006,210

5,7906,300

13,3408,7008,360

4,7203,3503,3102,780

1,740726

1,140522437

Outflow (acre-feet)

00

1,295480740

9089,4771,9402,001

443950

2,15020,040

5,6251,890

464337

528385

10494

2,82913,50310,427

1,764

346401438524398

Stage (feet

above datum)

1,243.511,244.001,244.581,244.451,244.49

1,244.641,245.621,245.711,244.91

2,743.732,745.092,745.042,745.542,740.76

2,740.802,740.732,741.192,742.232,743.33

2,744.462,746.282,748.932,750.572,751.92

2,751.832,749.362,747.822,747.77

1,621.941,622.471,623.061,622.941,622.38





57 Willow Creek Reservoir 08/92Continued 09/92

10/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

58 Pipestem Reservoir 04/92 05/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

Volume (acre-feet) (

Nebraska Contii

5,3206,4807,0007,0706,940

6,9206,9707,6207,4407,470

7,6007,8507,2807,180

North Dakota

9,9568,2808,1658,0057,772

6,9506,8226,8936,8416,825

6,7997,597

14,73213,85713,012

55,12857,20743,607

Evapor- - ation

acre-feet)ued

-

-

-

--

~

-

-

-

-

--

162 202253347244

245165895230

3876

221288370

7341,061

771

Discharge

Inflow (acre-feet)

1,2001,6001,5701,100

780

549885

4,3804,5702,680

2,1907,8501,2801,290

1,282 987138165

11

32338

159-

14

128,2675,5001,8512,029

45,37510,6713,541

Outflow (acre-feet)

516408

1,4101,1401,010

649851

5,3005,8403,540

3,34010,1102,0701,700

1,4682,462

---~

----~

5954,9412,4382,503

2,5257,531

16,370

Stage (feet

above datum)

1,623.221,624.881,625.601,625.621,625.48

1,625.521,625.591,626.491,626.421,626.32

1,626.551,626.951,626.101,625.97

1,442.50 1,440.171,440.321,440.111,439.79

1,439.941,439.691,439.831,439.731,439.70

1,439.651,447.911,448.191,447.431,446.68

1,470.771,471.631,465.66





59 Alum Creek Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

60 Deer Creek Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93


(acre-feet) (acre-feet)Ohio

46,28944,19641,94964,80166,427

67,26067,55771,00070,29670,724

70,20470,20482,05878,95280,054

79,05287,65076,381

21,88022,36321,75021,58221,401

21,58214,0326,1066,7216,456

6,66813,15723,65521,86721,789

Discharge

Inflow (acre-feet)

~~--~

_-----~

----~--

__----

__~~----

7507,6853,982

20,734

9,13723,73015,3436,3902,559

Outflow (acre-feet)

397618782964774

517841

8,2712,407

13,830

3,66910,2504,7782,1392,582

8,310403509

12,6347,727

12,70320,948

5,318

1,5964,824

11,6924,368

21,229

9,57320,79710,8086,5272,634

Stage (feet

above datum)

875.91875.03874.06882.90883.45

883.73883.92884.96884.73884.87

884.70884.70888.35887.43887.76

887.46889.95886.65

810.66811.03810.56810.43810.29

810.43804.09796.51796.40796.05

796.33803.28812.00810.65810.59





60 Deer Creek Lake 07/93Continued 08/93

09/93

61 Delaware Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

62 Dillon Lake 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

Discharge

Volume (acre-feet) (Ohio Continu

21,53021,49121,067

evapor ation Inflow

acre-feet) (acre-feet)ed

10,738756727

14,06514,22113,93519,92513,987

13,88313,8839,0808,8308,850

8,0768,410

19,942

~

_

2,79632,6007,432

42,937

8,60041,93026,397

14,306 -- 4,11713,920 -- 8,412

13,880 -- 15,65412,738 -- 70412,565 -- 1,107

17,87017,83817,98117,87017,901

17,83818,052 - 3,98114,216 -- 27,40513,750 - 16,81314,106 -- 54,660

Outflow (acre-feet)

9,577498434

31,5557,1938,096

89,08614,058

3,5222,502

34,8136,694

43,081

8,64041,90823,098

4,0928,020

15,830842609

43,76317,01111,19492,88436,824

15,2933,875

29,51815,97554,916

Stage (feet

above datum)

810.39810.36810.03

915.05915.17914.95919.25914.99

914.91914.91910.68910.43910.45

909.64910.01919.26915.24914.94

914.90914.03913.88

737.24737.22737.32737.24737.26

737.22737.26734.80734.46734.72





62 Dillon Lake Continued 02/9303/9304/9305/9306/93

07/9308/9309/93

63 Hoover Reservoir 04/9205/9206/9207/9208/92

09/9210/9211/9212/9201/93

02/9303/9304/9305/9306/93

07/9308/9309/93

64 Milton Reservoir 04/9205/9206/9207/9208/92


(acre-feet) (acre-feet)Ohio Continued

13,46313,14727,66118,31618,300

18,17217,91717,648

53,72351,67049,69372,09068,417

65,35858,54271,78971,17571,757

71,88671,88671,88664,06764,600

65,30158,70351,157

16,95016,85017,26020,62022,090

Discharge

Inflow (acre-feet)

26,90893,16756,57616,00310,720

30,1483,8633,939

--------

_--------

--------

----

__------

Outflow (acre-feet)

27,29692,60051,43819,06311,069

29,3403,8814,120

7,8319,3578,684

12,9748,708

8,1794,5306,5863,361

20,251

4,60220,17414,1523,9453,535

9,3754,1963,368

2,1526,343

11,2784,546

37,437

Stage (feet

above datum)

734.25734.02742.59737.52737.51

737.43737.27737.10

887.59886.80886.03894.06892.92

891.89889.41893.97893.78893.96

894.00894.00894.00892.43892.62

892.87889.47886.60

945.30945.24945.49947.47948.30



Map no.


Date of Discharge Stagecollection Evapor- (feet

(month/ Volume ation Inflow Outflow aboveyear) (acre-feet) (acre-feet) (acre-feet) (acre-feet) datum)

64 Milton Reservoir Continued

09/92 10/92 11/92 12/92 01/93

Ohio Continu ed

21,62019,29016,90313,04611,988

31,3906,299

18,27711,75322,204

948.04946.69945.27942.80942.08

02/93 03/93 04/93 05/93 06/93

12,20818,30422,28822,16221,838

2,78224,491

5,4054,017

12,698

942.23946.12948.40948.34948.16

07/93 08/93 09/93

21,92821,55022,036

5,3015,2548,859

948.21948.00948.27

65 O'Shaughnessy Reservoir 04/92 05/92 06/92 07/92 08/92

09/92 10/92 11/92 12/92 01/93

17,65917,42117,02818,01517,848

17,90717,18417,55017,25317,788

69,44217,00829,126

223,33843,528

8,1794,195

72,62314,51186,700

848.60848.36847.96848.96848.79

848.85848.06848.49848.19848.73

02/93 03/93 04/93 05/93 06/93

07/93 08/93 09/93

17,28318,05518,05517,73817,847

17,54016,14515,990

21,950107,05056,22110,21415,796

65,0363,5311,515

848.22849.00849.00848.68848.79

848.48847.00846.82




66 Sand Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

67 Chippewa Flowage 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93


(acre-feet) (acre-feet)South Dakota

16,50019,10019,20019,80018,200

16,30016,90014,40012,90012,500

12,00011,60014,90018,40016,600

18,70026,70033,90029,300

Wisconsin

2,2502,2502,2502,2502,250

2,2502,2502,2502,2502,250

2,2502,2502,2502,2502,250

Discharge


1928362

1431,100

6311,6302,5701,760

579

250241750

12,5707,640

5,70022,19058,39064,500

565,754752,044328,051137,833310,640

133,051194,980334,283339,655231,851

173,572179,049277,553610,300573,600

Stage (feet

above datum)

1,287.251,287.711,287.721,287.811,287.56

1,287.231,287.341,286.831,286.571,286.48

1,286.391,286.301,286.931,287.581,287.31

1,287.631,288.831,289.901,289.25

--~-----

--------

__----~~



Map no.


67 Chippewa Flowage Continued

68 Dairyland Reservoir

69 Lake Mendota

Date of collection (month/ Volume

year) (acre-feet) (

DischargeEvapor-

ation Inflow Outflow acre-feet) (acre-feet) (acre-feet)

Stage (feet

above datum)

Wisconsin Continued

06/93 2,250 - - 1,030,00007/93 2,25008/93 2,25009/93 2,250

03/92 44,00004/92 44,00005/92 44,00006/92 44,00007/92 44,000

08/92 44,00009/92 44,00010/92 44,00011/92 44,00012/92 44,000

01/93 44,00002/93 44,00003/93 44,00004/93 44,00005/93 44,000

06/93 44,00007/93 44,00008/93 44,00009/93 44,000

03/92 410,18904/92 412,95505/92 411,29606/92 409,45207/92 413,507

08/92 412,86209/92 412,86210/92 406,41111/92 411,20312/92 410,466

316,400187,400178,400

163,000235,900139,30059,370

122,600

65,67078,670

123,500104,10074,400

65,34056,85076,290

165,200185,200

287,300117,80078,52068,610

__---

---~

------~

----~

-----~

----

9.9.9.

689880

9.6010.04

__-

9.9.9.

979727

9.799.71





69 Lake Mendota 01/93Continued 02/93

03/9304/9305/93

06/9307/9308/9309/93

70 Lake Menomin 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93


(acre-feet) (acre-feet)Wisconsin Continued

407,241405,951424,382424,751413,876

417,101429,911425,027418,668

11,00011,00011,00011,00011,000

11,00011,00011,00011,00011,000

11,00011,00011,00011,00011,000

11,00011,00011,00011,000

Discharge


_-----~

__~ --

149,600153,40092,57066,48081,360

53,54066,89073,82088,96066,720

60,31054,67091,840

137,200104,100

176,10095,64084,89068,500

Stage (feet

above datum)

9.369.22

11.2211.2610.08

10.4311.8211.2910.60

------

-------

-----

_--~



Map no.


Date of Discharge Stagecollection Evapor- (feet(month/ Volume ation Inflow Outflow above

year) (acre-feet) (acre-feet) (acre-feet) (acre-feet) datum)

71 LakeMononaWisconsin Cont inued

03/92 88,038 04/92 89,759 05/92 89,662 06/92 88,948 07/92 90,279

4.384.914.884.665.07

08/92 09/92 10/92 11/92 12/92

90,79990,83187,58488,46188,883

5.235.244.244.514.64

01/93 02/93 03/93 04/93 05/93

06/93 07/93 08/93 09/93

88,55987,38991,64293,65692,552

92,64996,48094,50093,526

4.544.185.496.115.77

5.806.986.376.07

72 Lake Waubesa 03/92 04/92 05/92 06/92 07/92

31,80132,80032,89632,55032,433

11,7308,4205,7603,0603,730

4.204.724.774.595.05

08/92 09/92 10/92 11/92 12/92

01/93 02/93

33,75933,14531,76331,99331,974

31,97431,398

2,76012,76014,17010,50012,610

15,03010,940

5.224.904.184.304.29

4.293.99





73 Lake Wausau 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93

74 Lake Wissota (5548) 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

E vapor- - Volume ation


13,900

13,90013,90013,90013,900

13,90013,90013,90013,90013,900

13,90013,90013,90013,90013,900

13,90013,90013,90013,900

128,558213,499206,612202,020208,907

192,837204,316208,907208,907167,585

Discharge


374,000564,400269,000139,500132,700

102,400240,200200,700330,800226,200

166,400133,700230,200510,300465,400

709,300215,600168,900239,300

28,40033,68248,82825,84182,297

32,98229,86264,24452,63482,389

Stage (feet

above datum)

_------~

---~

---~

--~

1,306.181,312.221,311.551,311.301,311.61

1,310.851,311.441,311.811,311.741,308.93





74 Lake Wissota (5548) 01/93Continued 02/93

03/9304/9305/93

06/9307/9308/9309/93

75 Lake 7746 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93



142,332114,78498,714

--

_---

2,0002,0002,0002,0002,000

2,0002,0002,0002,0002,000

2,0002,0002,0002,0002,000

2,0002,0002,0002,000

Discharge


55,38347,81216,49933,68048,830

25,84082,30032,98029,860

609,1001,028,000

510,500253,100238,000

180,100558,500372,500614,200521,400

384,400312,200381,100

1,186,0001,022,000

1,612,000621,900381,200490,300

Stage (feet

above datum)

1,306.991,304.781,303.48

~~

_---~

_---~

----~

-----~

---





76 Spring Valley Lake 03/9204/9205/9206/9207/92

08/9209/9210/9211/9212/92

01/9302/9303/9304/9305/93

06/9307/9308/9309/93



2,068

2,0832,1142,0372,052

2,0372,0222,0222,0222,022

2,0072,0071,9762,0522,114

2,0372,0372,1442,068

Discharge

Inflow (acre-feet)

2,9405,9701,090

9142,200

6721,070

9181,540

700

594461

4,2003,8501,770

5,1201,2804,4401,080

Outflow (acre-feet)

6,3105,9801,5201,4402,510

1,0801,5301,3602,1201,220

1,090926

5,0204,9702,190

5,5601,9804,5101,580

Stage (feet

above datum)

940.61940.73940.94940.36940.53

940.39940.28940.29940.33940.26

940.25940.22940.01940.52940.93

940.44940.42941.10940.65


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e-

ton

(MI/L

)

Prop

a-

zine

(MI/L

)

Sim

a-

zlne

(M

I/L)

Illin

ois C

onti

nued

4 L

ake

Dec

atur

5 L

ake

Shel

byvi

lle

6 L

ake

Ver

mill

ion

04/3

0/92

07/0

7/92

09/0

1/92

09/0

1/92

10/2

0/92

10/2

0/92

01/1

4/93

03/2

4/93

03/2

4/93

07/0

7/93

09/0

9/93

04/3

0/92

07/0

7/92

08/2

5/92

08/2

5/92

10/2

0/92

01/1

4/93

03/2

6/93

07/1

2/93

07/1

2/93

09/0

8/93

04/3

0/92

07/0

7/92

07/0

7/92

07/0

7/92

07/0

7/92

S S S LD

BD

S S S BD

S S S S S BD

S S S S LD S S S LD BD

LD

0.06 .1

2<.

05

<.05

<.05

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9

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<.05 .2

0

.07

.07

.11

.25

.26

.26

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0.33

1.2

1.9

1.9

1.1

1.0

1.1 .8

0

.63

4.9

3.4 .4

5

.46

1.1

-

.78

1.1 .5

3

.93

-- 1.3 .9

22.

9- 2.

9

<0.0

5

<.05

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<.05

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0.58

2.7 .9

2

.91

.69

.54

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5.5 .6

8

1.4

1.7

1.8

1.8

1.6 .50

.18

1.9

1.1

2.1 1.8

5.3

6.1

5.2

5.7

0.08 .3

9.3

3

.33

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1.2 .3

4

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9

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6

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1.3 .2

6

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.26

.27

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.69

.81

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0.19 .7

5

.25

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<.05

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2.8 .1

2

.30

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<.05 .6

7

.65

.66

1.3

4.4

7.5

4.3

5.1

0.07 .4

4

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-- <.05

<.05

2.2 .3

1

.27

.31

.42

.43

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<.05 .1

2-

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3.3

4.1

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5

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0

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9--

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50

<.50

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-- <.50

<.50

1.1 <.50

1.0

0.95

1.1 .3

8

.39

.22

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.18

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2.8 .3

3

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.35

.34

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1.3 .6

2

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.80

.74

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5<.

05

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6

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6

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<.05 .0

6

<.05

<.05 .0

6

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<.05

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5<.

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<0.0

5

<.05

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<.05

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<.05

<.05

<.05 .0

5

<.05 .2

8

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.15

.14

.09

<.05

<.05 .1

3

.05

.11

<.05

<.05

<.05

<.05

<.05

Tabl

e 5.

A

naly

tical

res

ults

for

sele

cted

her

bici

des

and

six

met

abol

ites

in s

ampl

es c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

ncentrations

o * 9 (D O S a. X (D 3- o°

5! (D JO X (D 3- o' a (D (D sr o- I w 0) 3 a. z c 5' 5f 5' O 1 3 w 3T a (D a. S 1 w 8f 3 3D (D <g (D 2.

55

Dat

e of

co

l lee

- M

ap

tion

no.

(mon

th/

(fig

. 1)

Res

ervo

ir n

ame

day/

year

)

Sam

pl

e ty

pe

Ala

- ch

lor

Ala

- ch

lor

ESA

Am

e-

tryn

(H

9/L)

Atra

- zi

ne

(H9/

L)D

EA(H

9/L)

DIA

Cya

n-

azin

e

Cya

n-

azin

e am

ide

(H9/

L)

De-

et

hyl-

cy

an-

azin

e (H

9/L)

De-

et

hyl-

cy

an-

azin

e am

ide

Met

ol-

achl

or

(H9/

L)

Met

ri-

buzi

nPr

ome-

to

n(M

9/L)

Prop

a-

zine

(H

9/L)

Sim

a-

zine

Illin

ois C

onti

nued

6 La

ke V

erm

illi

on

08/2

8/92

Con

tinue

d 10

/21/

9201

/13/

93

03/1

7/93

07/0

6/93

07/0

6/93

09/0

2/93

7 Li

ttle

Gra

ssy

Lake

05

/01/

92

06/2

5/92

08/2

7/92

10/2

2/92

01/1

5/93

03/2

6/93

07/0

7/93

09/2

1/93

8 R

end

Lake

04

/30/

92

04/3

0/92

06/2

4/92

08/2

4/92

10/2

1/92

01/1

1/93

03/2

4/93

07/0

7/93

09/2

0/93

S S S S S LD S S S S S S S S S S LD S S S S S S S

<0.0

5

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<.05 .1

5

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1.4 .70

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4.7

5.1 .9

5

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41.

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5

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0

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1

0.12 .0

9- <.

05 .17

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0.18 .1

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1.3

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5

<.05

<.05

<.05

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<.05

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<.05

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<.05

<.05

<.05

<.05

<.05 .0

8

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<.05 .0

6

.10

.17

Tabl

e 5.

A

naly

tical

res

ults

for

sel

ecte

d he

rbic

ides

and

six

met

abol

ites

in s

ampl

es c

olle

cted

fro

m 7

6 re

serv

oirs

in t

he M

idw

este

rn U

nite

d S

tate

s, A

pril

1992

thr

ough

Sep

tem

ber

19

93

Co

ntin

ue

d

Map

no

. (f

ig. 1

) R

eser

voir

nam

e

Dat

e of

co

llec

tio

n (m

onth

/ da

y/ye

ar)

Sam

pl

e ty

pe

Ala

- ch

lor

(H9/

L)

Ala

- ch

lor

ESA

(H

9/L)

Am

e-

tryn

(H

9/L)

Atr

a-

zine

(H

9/L)

DEA

(WJ/L

)D

IA(H

9/L)

Cya

n-

azin

e (H

9/L)

Cya

n-

azln

e am

ide

(H9/

L)

De-

et

hyl-

cy

an-

azin

e (H

9/L)

De-

et

hyl-

cy

an-

azin

e am

ide

(H9/

L)

Met

ol-

achl

or

(H9/

L)

Met

ri-

buzi

n (H

9/L)

Prom

e-

ton

(H9/

L)

Prop

a-

zine

(H

9/L)

Sim

a-

zine

(H

9/L)

Indi

ana

9 B

rook

ville

Lak

e

10

Cat

arac

t L

ake

11

Eag

le C

reek

Res

ervo

ir

05/0

7/92

05/0

7/92

07/1

3/92

08/1

9/92

10/2

3/92

01/0

6/93

03/2

4/93

07/0

8/93

09/0

7/93

05/0

4/92

05/0

4/92

07/1

1/92

08/2

4/92

10/2

1/92

01/1

4/93

03/2

2/93

07/0

7/93

09/0

2/93

05/0

4/92

07/0

6/92

08/2

7/92

10/2

7/92

01/0

7/93

03/2

9/93

07/0

8/93

07/0

8/93

09/0

3/93

09/0

3/93

S BD

S S S S S S S S LD

S S S S S S S S S S S S S S BD

S BD

0.09 .0

9

.09

<.05 .1

3

.06

<.05 .2

1

.60

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<.05

<.05

<.05 .4

4

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0

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0.81 .7

5

1.1 .8

0

1.1

1.8 .7

9

1.1

3.1 .5

6

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2.3 .8

5

2.3

1.3

1.8

1.6 .5

7

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1.3

1.2

2.3

2.5

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1.6

1.6

1.3 .1

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6

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2.6

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1.8 .2

3

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0

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0.62 .6

3

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1

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1.8 .2

7

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8

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8

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1

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8

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9

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2

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5

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0.20 .2

0

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8

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1.4

1.4 .9

9

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4.6 .7

1

2.3

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7

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5

<.05

<.05

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<.05

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<.05

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<.05 .1

5

<.05

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0.08 .8

6

.09

<.05 .1

4

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<.05 .0

8

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.11

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.21

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<.05

<.05 .4

8

.18

.10

.36

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<.05

<.05

<.05 .2

6

.27

.22

.21

g

Tabl

e 5.

A

naly

tical

res

ults

for

sele

cted

her

bici

des

and

six

met

abol

ites

in s

ampl

es c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il n

19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

= 3

d tt

* §

to

O31

(o

tn i

b.

Is.

H §

go a S (D X 5. o f !

Dat

e o

f co

dec-

Map

tio

n

Sam

-no

, (m

onth

/ pi

e(f

ig.

1)

Res

ervo

ir na

me

day/

year

) ty

pe

Ala

-ch

lor

(MJ/

L)

Ala

-ch

lor

ES

A(H

9/L)

Am

e-tr

yn(H

9/L)

Atr

a-zl

ne(H

9/L)

DE

A(H

9/L)

DIA

(H9/

L)

Cya

n-az

ine

(H9/

L)

Cya

n-az

ine

amid

e(H

9/L)

De-

et

hyl-

cyan

-az

ine

(H9/

L)

De-

et

hyl-

cyan

-az

ine

amid

e(H

9/L)

Met

ol-

achl

or(H

9/L)

Met

ri-bu

zin

(H9/

L)

Pro

me-

ton

(H9/

L)

Pro

pa-

zine

(H9/

L)

Sim

a-zi

ne(M

9«-)

Ind

ian

a C

on

tinu

ed

12

Hun

tingt

on L

ake

05/0

5/92

S

07/1

4/92

S

07/1

4/92

L

D

08/2

6/92

S

OS

/26/

92

BD

10/2

7/92

S

10/2

7/92

L

D

01/1

1/93

S

03/2

3/93

S

07/0

9/93

S

0.22

1.1

1.3 .05

.05

.05

.06

.06

.05

1.3

4.8

15 13 5.8

5.6

4.6

4.4

2.5

1.3

11

<0.0

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

1.1

6.1

6.4

1.2

1.2 .4

2

.43

.36

.22

7.7

0.30

1.3

1.5 .4

5

.48

.35

.35

.26

.12

2.5

0.21 .8

7

.96

.26

.30

.15

.14

.11

.05

2.0

0.42

2.6

2.8 .4

9

.59

.17

.10

<.05

<.05

3.7

0.15

1.3

1.6

1.2

1.2

<.05 .1

8

<.05 .1

0

3.6

<0.0

5

<.05 .3

1

.13

.11

<.05 .0

6

<.05

<.05 .3

3

<0.5

0

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

0.67

3.4

3.5 .4

3

.45

.30

.31

.25

.35

4.3

0.08 .3

8

.42

<.05

<.05

<.05

<.05

<.05 .0

7

.67

<0.0

5

.11

.11

.09

.09

<.05

<.05

<.05

<.05

<.05

<0.0

5

.08

.08

<.05

<.05

<.05

<.05

<.05

<.05 .1

0

<0.0

5

.26

.28

.05

.05

<.05

<.05

<.05

<.05 .1

9

09/1

6/93

S

.12

5.9

<.05

1.3

.40

.32

.82

.74

<.05

<.50

.62

<.05

.12

<.05

.05

13

Lake

Sha

fer

14

Man

sfie

ld L

ake

39 O

w 5 o

05/0

5/92

S07

/14/

92

S

07/1

4/92

08/2

6/92

10/2

6/92

01/1

2/93

03/2

3/93

07/1

2/93

09/0

3/93

09/0

3/93

05/0

4/92

07/1

1/92

08/2

4/92

10/2

1/92

01/1

2/93

BD

S S S S S S LD S S S S S

.08

.18

.23

<.05

<.05

<.05

<.05 .1

1.0

9.0

8

.12

.12

.08

<.05

<.05

3.1

5.4

4.6

2.4

2.2

<.10

2.5

3.6

6.2

6.1 1.0 .82

1.9 .6

8

<.10

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

.35

L5 1.0 .19

.17

.20

.10

1.1 .4

3

.45

1.6

2.3

1.8

1.6 .4

1

.09

.33

.29

.06

.10

.08

.06

.33

.22

.23

.29

.30

.53

.57

.20

.06

.16

.15

<.05 .0

6

<.05

<.05 .1

9.1

2

.12

.20

.16

.31

.28

<.05

.12

.31

.19

<.05

<.05

<.05

<.05 .2

3.1

6.1

6

.21

.21

.19

.19

<.05

<.05 .1

3.2

7

.12

.08

<.05

--

.09

.10

.05

.12

.26

.18

<.05

<.05 .1

0

<.05

<.05

<.05

-- <.05

<.05

<.05

<.05

<.05 .0

7

<.50

<.50

<.50

<.50

<.50

<.50

- <.50

<.50

<.50

<.50

<.50

<.50

.07

.27

.31

<.05 .0

5

<.05 .1

8

.19

.44

.45

.65

.62

.57

.34

.21

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .0

5

.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .1

0

.09

.05

<.05

<.05

<.05 .0

9

<.05

<.05 .1

2

.24

.16

.11

<.05

Tabl

e 5.

A

naly

tical

res

ults

for s

elec

ted

herb

icid

es a

nd s

ix m

etab

olite

s in

sam

ples

col

lect

ed fr

om 7

6 re

serv

oirs

in th

e M

idw

este

rn U

nite

d S

tate

s, A

pril

1992

thro

ugh

Sep

tem

ber

1993

Con

tinue

d

Dat

e of

code

c-M

ap

tion

no.

(mon

th/

(fig

. 1)

R

eser

voir

nam

e da

y/ye

ar)

Sam

pl

ety

pe

Ala

-ch

lor

(H9/

L)

Ala

-ch

lor

ES

A(H

9/L)

Am

e-tr

yn(n

g/L)

Atr

a-zi

ne(H

9/L)

DE

A<n

g/L)

DIA

(ng/L

)C

yan-

azin

efog

/i-)

Cya

n-az

ine

amid

e(n

g/i-)

De-

ethy

l-cy

an-

azin

e0»

9/L)

De-

et

hyl-

cyan

-az

ine

amid

e(n

g/L)

Met

ol-

achl

or(H

9/L)

Met

ri-bu

zin

(ng/L

)P

rom

e-to

n(n

g/L)

Pro

pa-

zine

(H9/

L)

Sim

a-zi

ne(H

9/L)

India

na C

ontin

ued

i s S a. ? S c ?

14

Man

sfie

ld L

ake

01/1

2/93

Con

tinue

d 01

/12/

93

03/2

2/93

07/1

0/93

07/1

0/93

BD

LD S S LD

<0.0

5

<.05

<.05 .1

7

.17

<0.1

0_

.64

.95

1.0

<0.0

5

<.05

<.05

<.05

<.05

0.42 .4

3

.30

4.2

4.2

0.20 .2

1

.17

.75

.74

<0.0

5

.05

.06

.28

.28

<0.0

5

<.05

<.05 .6

9

.72

_ _ <0.0

5

.28

.29

_ _ <0.0

5

<.05

<.05

_ _ <0.5

0

<.50

<.50

0.21 .2

2

.19

1.9

1.9

<0.0

5

<.05

<.05

<.05

<.05

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5

<.05

<.05

<.05

<.05

<0.0

5

<.05

<.05

<.05

<.05

<0.0

5

<.05

<.05

<.05

<.05

09/1

5/93

S

.06

2.4

<.05

3.4

1.1

.68

.56

.48

.08

<.50

.84

<.05

<.05

<.05

<.05

15

Mis

siss

inew

a L

ake

tt a

to x <§ w 9 TO

16

Mon

roe

Lak

e

05/0

4/92

07/1

4/92

08/2

6/92

08/2

6/92

10/2

6/92

01/1

1/93

03/2

3/93

07/0

9/93

09/1

5/93

05/0

6/92

07/0

7/92

08/2

5/92

10/2

1/92

10/2

1/92

01/1

3/93

03/2

5/93

07/0

8/93

09/0

1/93

S S S LD S S S S S S S S S BD

S S S S

.56

2.7 .3

5

.34

.05

<.05

<.05

1.5 .2

4

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

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8.4

6.1

5.8

2.2

1.7 .9

49.

4

12 <.10

<.10

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<.10

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5<.

10 .15

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

3.9

11 4.2

4.1 .6

6

.23

.25

8.0

4.3 .0

6

.09

.12

.12

.12

.10

<.05 .0

6

.23

.42

1.7

1.4

1.3 .5

2

.17

.32

2.0

1.4

<.05

<.05

<.05

<.05

<.05 .0

5

<.05

<.05 .0

5

.30

1.2 .8

6

.76

.27

.10

.07

1.6

1.1

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

1.7

5.1

2.0

1.7 .1

2

.06

<.05

5.8

2.5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

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3.2

1.9

1.2 .1

6

..

.05

3.0

1.7

<.05

<.05

<.05

<.05

<.05

<.05 .0

6

<.05 .3

2

.28

.18

<.05

<.05 .4

5

.26

_. <.05

<.05

<.05

<.05

_. <.05

<.05

<.05

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

2.1

4.9

1.8

1.7 .3

0

.14

.14

4.0

1.4

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

.54

.67

.12

.11

<.05

<.05 .0

9<.

05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .0

5

.05

.05

.05

<.05

<.05

<.05 .0

6

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .1

3.0

5

<.05

<.05

<.05

<.05 .0

9

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

.88

.80

.24

.22

<.05

<.05

<.05 .6

5.2

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

Tabl

e 5.

A

naly

tical

res

ults

for

sele

cted

her

bici

des

and

six

met

abol

ites

in s

ampl

es c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il

> o

o o = 3

tO 3

83

1 f § O

CO

<|a 0)

o> <

b »

5"

11 cr -

rS

|(0

O

W

Q.

(0 CO 1 o s- z §

i &

</c

- uii

wu^ii

v_

»\sj

jit>

i I i

ut>

i i

<7<?

tj

Dat

e of

code

c-M

ap

tion

no.

(mon

th/

(fig

. 1)

Res

ervo

ir n

ame

day/

year

)

' v

svsi

i

Sam

pl

ety

pe

III

IUV

*V

J

Ala

-ch

lor

(jig

/L)

Ala

-ch

lor

ESA

(|xg/

L)

Am

e-tr

yn(|i

g/L)

Atra

-zi

ne(n

g/L)

DEA

(ng/

L)D

IA(n

g/L)

Cya

n-az

ine

(WJ/L

)

Cya

n-az

ine

amid

e(n

g/L)

De-

ethy

l-cy

an-

azin

e(H

9/L)

De-

et

hyl-

cyan

-az

ine

amid

e(n

g/L)

Met

ol-

achl

or(n

g/L)

Met

ri-bu

zin

(ng/

L)

Prom

e-to

n(ng

/L)

Prop

a-zi

ne(H

9/L)

Sim

a-zi

ne(M

9/L)

Indi

ana C

onti

nued

17

Mor

se R

eser

voir

05

/07/

92

07/0

6/92

08/2

5/92

08/2

5/92

10/2

7/92

01/0

7/93

03/2

9/93

03/2

9/93

03/2

9/93

07/0

9/93

S S S LD S S S BD

LD S

0.59

3.4 .1

5.1

7

.14

.10

.06

.06

.07

.57

2.8

11 7.5

7.3

3.1 1.8

1.3

- 1.6

6.2

<0.0

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

4.0

12 2.1

2.3

1.6 .25

.26

.24

.27

4.4

0.57

1.5 .6

8

.73

.53

.15

.14

.13

.15

1.1

0.37

1.2 .3

6

.36

.22

.06

<.05

<.05 .0

5

.57

0.96

1.2 .28

.33

.19

<.05

<.05

<.05

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8

0.17 .1

8

.20

.17

- <.05

<.05

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0

<0.0

5

.06

.08

.06

-- <.05

<.05

<.05 .1

4

<0.5

0

<.50

<.50

<.50

-- <.50

<.50

<.50

<.50

2.8

5.3 .6

8

.77

.41

.27

.21

.20

.22

2.1

0.10 .2

5<.

05

<.05

<.05

<.05

<.05

<.05

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5

.08

.07

.07

.06

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<.05

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0

<0.0

5

.14

<.05

<.05

<.05

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<.05

<.05

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5

.07

<.05

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<.05

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09/0

3/93

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.07

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052.

7.9

5.5

0.3

0.2

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05<.

50.9

8<.

05.0

9<.

05<.

05

18

Pato

ka L

ake

3 O 3 i s

05/0

6/92

05/0

6/92

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7/92

07/0

7/92

08/2

5/92

10/2

2/92

01/1

3/93

03/2

5/93

03/2

5/93

07/1

3/93

S LD S LD S S S S LD S

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

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5

<.10

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05

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05

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05

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05

<.10

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05

<.10

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05

<.10

<.

05

<.10

<.

05<.

10

<.05

.11

<.05

.11

.11

.13

.15

.12

.09

.08

.07

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9

<.05

<.05

<.05 .0

5<.

05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

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5<.

05

<.05

<.05

<.05

<.05 .0

9

<.05

<.05

<.05

<.05

<.05 .0

9- <.

05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

-- <.05

<.05

<.50

<.50

<.50

<.50

<.50

<.50

-- <.50

<.50

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .0

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

09/1

4/93

S

<.05

.29

<.05

.28

.07

.05

.06

<.05

<.05

<.50

.05

<.05

<.05

<.

05<.

05

19

Sala

mon

ie L

ake

05/0

5/92

S

07/1

4/92

S

08/2

6/92

S

10/2

6/92

S

01/1

1/93

S

.17

3.0 .7

0

.15

.08

4.4

17 11 7.6

2.6

<.05

<.05

<.05

<.05

<.05

.95

9.4

4.6

2.2 .3

1

.23

1.6

1.4 .8

9

.20

.14

1.0 .7

2

.48

.09

.30

4.4

2.8 .6

1

.10

<.05

2.0

1.8 .4

4~

<.05 .4

0

.21

.10

-

<.50

<.50

<.50 .3

7-

1.4

3.4

2.2 .5

9

.26

.16

.91

.26

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .1

1

.05

<.05

<.05

.05

.22

.09

.07

<.05

Tabl

e 5.

A

naly

tical

res

ults

for

sele

cted

her

bici

des

and

six

met

abol

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A

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ampl

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thro

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tem

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tinue

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e 5.

A

naly

tical

res

ults

for

sele

cted

her

bici

des

and

six

met

abol

ites

in s

ampl

es c

olle

cted

from

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rese

rvoi

rs in

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tern

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ted

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tes,

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il

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il 1992

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e of

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. 1)

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e 5.

A

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des

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in s

ampl

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tern

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tes,

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il 19

92 th

roug

h S

epte

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r 19

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. 1)

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for

sele

cted

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des

and

six

met

abol

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ampl

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and

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met

abol

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in s

ampl

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olle

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from

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rese

rvoi

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the

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wes

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ted

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tes,

Apr

il 19

92 th

roug

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nam

e

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(H9/

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37

Leec

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0/92

11/0

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01/2

0/93

01/2

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4/93

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2/93

09/0

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Tabl

e 5.

A

naly

tical

res

ults

for

sele

cted

her

bici

des

and

six

met

abol

ites

in s

ampl

es c

olle

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from

76

rese

rvoi

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the

Mid

wes

tern

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ted

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tes,

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il 19

92 th

roug

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epte

mbe

r 19

93 C

ontin

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ncentrations

olD

ate

of

code

c-

Map

tio

n no

. (m

onth

/ (f

ig. 1

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eser

voir

nam

e da

y/ye

ar)

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pl

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tr

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L)

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(H9/

L)D

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9/L)

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9/L)

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9/L)

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tinue

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4/93

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38

Pine

Riv

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eser

voir

05

/13/

92

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0/92

08/1

8/92

11/0

3/92

01/0

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03/1

5/93

07/1

3/93

09/2

1/93

39

Sand

y La

ke R

eser

voir

05

/14/

92

07/0

2/92

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0/92

11/0

4/92

01/0

7/93

03/1

7/93

07/1

5/93

09/2

3/93

40

Win

nibi

gosh

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05/1

4/92

Res

ervo

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05/1

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e 5.

A

naly

tical

res

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for

sel

ecte

d he

rbic

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and

six

met

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in s

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6 re

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19

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41

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rison

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<.05

<.05

<.05 .0

5

.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.0

5

<.0

5

<.0

5

<.0

5

<.0

5

<0.0

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.0

5

<.05

<.05

<.05

<.05

§

Tabl

e 5.

A

naly

tical

res

ults

for

sele

cted

her

bici

des

and

six

met

abol

ites

in s

ampl

es c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il

Concentrations o

April 1992

Throw 'c

oCO

»

« S

er ^

* c

rg

o 8s 8 X cr o Q

. 2 cr

o S CO D> Q.

t o 6? 3 O i 5 <? 8 2 1

o CO

<D 3D 8» i

Dat

e of

co

dec-

M

ap

tion

no.

(mon

th/

(fig

. 1)

Res

ervo

ir n

ame

day/

year

)

Sam

pl

e ty

pe

Ala

- ch

lor

Gig/L

)

Ala

- ch

lor

ESA

Am

e-

tryn

Atra

- zl

neD

EA

DIA

Gig/L

)

Cya

n-

azin

e

Cya

n-

azln

e am

ide

Gig/L

)

De-

et

hyl-

cyan

- az

lne

De-

et

hyl-

cyan

- az

ine

amid

eM

etol

- ac

hlor

Met

ri-

buzl

nPr

ome-

to

n G

ig/L

)

Prop

a-

zine

Sim

a-

zine

Mis

sour

i C

onti

nued

42

Har

ry S

Tru

man

01

/12/

93R

eser

voir

Con

tinue

d 03

/10/

93

06/1

6/93

09/1

7/93

43

Long

Bra

nch

Lake

05

/05/

92

05/0

5/92

07/1

5/92

08/2

4/92

10/2

1/92

10/2

1/92

10/2

1/92

01/0

7/93

03/2

2/93

03/2

2/93

07/0

1/93

09/2

3/93

09/2

3/93

44

Mar

k Tw

ain

Lake

05

/06/

92

07/1

5/92

07/1

5/92

08/2

4/92

08/2

4/92

10/2

2/92

01/0

7/93

01/0

7/93

03/2

2/93

06/2

3/93

LD S S S S LD S S S BD

LD S S LD S S BD

S S BD

S BD

S S LD S S

- <0.0

5

.14

.06

.05

.06

.05

.07

.05

.05

.06

<.05

<.05

<.05 .1

1

.07

.06

<.05 .0

5

.06

<.05

<.05 .0

5<.

05

<.05

<.05 .0

9

0.12 .1

1

.31

1.4

1.0

1.0 .9

7

.99

1.5

1.7

1.7

1.6 .9

0.9

9

.83

2.0

2.0

1.0 .8

2

.84

.70

.68

.51

1.2

1.3 .5

1

.66

-- <0.0

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

- 0.24

1.5

1.8

1.1 1.2

1.5

2.1

2.5

2.3

2.6

1.7 .6

1.5

9

1.2

1.3

1.2

1.6

2.1 1.9

2.0

2.0

2.2

2.2

1.7 .8

6

1.6

~ 0.05 .1

3

.32

.20

.22

.24

.43

.54

.48

.55

.37

.20

.18

.17

.40

.37

.30

.33

.34

.35

.34

.38

.39

.30

.25

.25

-- <0.0

5<.

05 .13

.11

.20

.16

.11

.29

.27

.28

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.09

.08

.08

.30

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.17

.15

.16

.20

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.13

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- <0.0

5<.

05

<.05 .5

7

.64

.86

.52

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.70

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.20

.17

.95

.85

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.42

.41

.36

.42

.38

.30

.20

.11

.40

- <0.0

5<.

05

<.05 .2

5

.24

.34

.53

.38

.35

.37

-- .16

.17

.32

.84

.91

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.21

.30

.24

.22

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-- <0.0

5<.

05

<.05

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<.05 .1

1

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7.0

9

.09

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<.05 .0

7.0

8.0

6

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50<.

50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

- <.50

<.50

<.50

<.50

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<.50

<.50

<.50

<.50

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5.3

2

.30

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.06

.05

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<.05

<.05 .1

1.1

2

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.26

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- <0.0

5<.

05

<.05

<.05

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5<.

05<.

05

<.05

<.05

<.05

<.05

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<.05

<.05

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<.05

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<.05

<.05

<.05

<.05

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- <0.0

5<.

05<.

05

<.05

<.05 .0

8

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<.05 .0

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05

<.05

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<.05

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<.05

<.05

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5/93

S

.09

2.1

<.05

2.5

.67

.32

.70

.47

.07

<.50

.48

<.05

<.05

<.

05<.

05

Tabl

e 5.

A

naly

tical

res

ults

for

sele

cted

her

bici

des

and

six

met

abol

ites

in s

ampl

es c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

Dat

e of

co

llec-

M

ap

tion

no.

(mon

th/

(fig.

1)

Res

ervo

ir na

me

day/

year

)

Sam

pl

e ty

pe

Ala

- ch

lor

(M9/L

)

Ala

- ch

lor

ESA

(M9/

L)

Am

e-

tryn

Atra

- zi

ne(ng

/L)

DEA

(M9/

L)D

IAC

yan-

az

ine

(ng/L

)

Cya

n-

azin

e am

ide

De-

et

hyl-

cyan

- az

ine

De-

et

hyl-

cyan

- az

ine

amid

e(ng

/L)

Met

ol-

achl

or

(H9/

L)

Met

ri-

buzi

n (M

9/L)

Prom

e-

ton

Prop

a-

zine

(H

9/L)

Sim

a-

zine

(M

9/L)

Mis

sour

i C

ontin

ued

3 2L 1 3D 8 c sr 0 i 0 & X 3- 5' £ IB w 0> 3

Q. S' I 1 I 0 "^ 0 =: i =5 3 (Q 3"

? 3

45

Pom

me

de T

erre

Lak

e 05

/06/

9207

/08/

9208

/25/

9210

/14/

9201

/12/

93

03/1

0/93

03/1

0/93

06/1

6/93

09/1

7/93

09/1

7/93

46

Smith

ville

Lak

e 05

/05/

9205

/05/

9207

/07/

9207

/07/

9207

/07/

92

08/2

6/92

08/2

6/92

10/2

1/92

01/0

6/93

03/2

5/93

03/2

5/93

06/2

5/93

09/2

9/93

09/2

9/93

S S S S S S LD S S LD S BD S BD

LD S LD S S S BD S S LD

<0.0

5<.

05<.

05<.

05<.

05

<.05

<.05

<.05

<.05

<.05

<.05

- <.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

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8<.

05<.

05

<0.1

0

<.10

<.10

<.10

<.10

<.10

<.10

<.10

<.10

<.10 .5

4.6

8.5

3.5

2.4

3

.50

.45

.53

.54

.43

.45

.38

.76

.99

<0.0

5<.

05<.

05<.

05<.

05

<.05

<.05

<.05

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<.05

-- <.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

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5.0

5.0

5.0

5<.

05

<.05

<.05

<.05

<.05

<.05

2.2

-- 2.9

2.9

3.1

3.1

3.6

2.9

2.5

1.5

1.4

1.7

2.3

2.1

<0.0

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .6

1-- .5

0

.49

.57

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.49

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<0.0

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .2

4-- .2

7

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.19

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5<.

05<.

05<.

05<.

05

<.05

<.05

<.05

<.05

<.05 .6

9-- .4

4.4

6.5

9

.52

.87

.52

.39

.32

.31

.82

.77

.78

<0.0

5<.

05<.

05<.

05 <.

05<.

05<.

05<.

05<.

05 .45

-- .63

.48

.66

.43

.55

.42

.31

.24

.25

.30

.47

<.05

<.05

<.05

<.05

._ <.05

<.05

<.05

<.05

<.05

<.05

-- .13

.11 .13

.12

.14

.11 .11

<.05 .0

7.0

7.0

8

<0.5

0

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

-- <.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<.50

<0.0

5

<.05

<.05

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<.05

<.05

<.05

<.05

<.05

<.05 .1

8-- .3

3.3

4.3

9

.28

.35

.26

.14

.11

.11

.35

.48

.49

<0.0

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

- <.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .0

8<.

05

<.05

<.05

<0.0

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

-- <.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<0.0

5<.

05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

-- <.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<0.0

5<.

05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .1

7- <.

05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

Tabl

e 5.

A

naly

tical

res

ults

for s

elec

ted

herb

icid

es a

nd s

ix m

etab

olite

s in

sam

ples

col

lect

ed fr

om 7

6 re

serv

oirs

in th

e M

idw

este

rn U

nite

d S

tate

s, A

pril

1992

thro

ugh

Sep

tem

ber

1993

Con

tinue

d

incentratlons o

Dat

e of

co

llec-

M

ap

tion

no.

(mon

th/

(fig

. 1)

Res

ervo

ir n

ame

day/

year

)

Sam

pl

e ty

pe

Ala

- ch

lor

ban.

)

Ala

- ch

lor

ESA

ban.)

Am

e-

tryn

Atra

- zi

neba

n.)D

EAba

n-)

DIA

ban-

)

Cya

n-

azin

eba

n-)

Cya

n-

azin

e am

ide

ban.)

De-

et

hyl-

cy

an-

azin

eba

n.)

De-

et

hyl-

cy

an-

azln

e am

ide

ban.)

Met

ol-

achl

orba

n.)

Met

rl-

buzi

nba

n.)

Prom

e-

ton

ban.

)

Prop

a-

zine

ban.)

Sim

a-

zine

ban.)

M

Mis

sour

i C

onti

nued

8 9 Q.

X §. o" Q. 8 X 3- o_ £ 2. tr

o 1 » Q.

Z 5- s 3 O c | 3 3

47

Stoc

kton

Lak

e 05

/06/

92

07/0

8/92

08/2

5/92

10/1

4/92

01/1

2/93

03/1

0/93

06/1

6/93

09/1

7/93

48

Bra

nche

d O

ak L

ake

05/0

7/92

05/0

7/92

07/0

1/92

07/0

1/92

09/1

1/92

___

09/1

1/92

10/2

7/92

01/0

6/93

03/2

3/93

07/1

3/93

09/1

4/93

S S S S S S S S S BD

S LD S LD S S S S S

<0.0

5<.

05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .1

2

.12

<.05

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<.05

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<.05 .2

6

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10

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<.10

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<.10 .7

2

1.4

1.2 .9

2

1.5

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1.5

1.2

1.4

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05

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05

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2.7

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._.._._

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2.6

2.4

1.8

2.6

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<.05

<.05

<.05

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<.05

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<.05

Neb

rask

a

.72

.67

.69

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5

<.05

<.05

<.05

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<.05

<.05

<.05 .5

4

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05

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1

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05-- <.

05

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50

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<.05

<.05 .0

8

.06

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5<.

05

<.05

<.05

<.05

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<.05

<.05

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<.05

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<.05

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49

Cal

amus

Res

ervo

ir05

/08/

92

S

07/0

9/92

S

07/0

9/92

B

D

OS/

27/9

2 S

10/2

2/92

S

<.05

<.05

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05

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05

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e 5.

A

naly

tical

res

ults

for s

elec

ted

herb

icid

es a

nd s

ix m

etab

olite

s in

sam

ples

col

lect

ed fr

om 7

6 re

serv

oirs

in th

e M

idw

este

rn U

nite

d S

tate

s, A

pril

1992

thro

ugh

Sep

tem

ber

1993

Con

tinue

d

Dat

e of

co

llec-

M

ap

tion

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- no

, (m

onth

/ pi

e (f

ig. 1

) R

eser

voir

nam

e da

y/ye

ar)

type

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lor

(ug/

L)

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lor

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tryn

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yan-

az

ine

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e am

ide

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et

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cy

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azin

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zin

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ton

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a-

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rask

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amus

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tinue

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e 5.

A

naly

tical

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ults

for

sele

cted

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bici

des

and

six

met

abol

ites

in s

ampl

es c

olle

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from

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rese

rvoi

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wes

tern

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ted

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tes,

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il 19

92 th

roug

h S

epte

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r 19

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ww

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th/

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. 1)

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ervo

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ame

day/

year

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pl

e ty

pe

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lor

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7

Tabl

e 5.

A

naly

tical

res

ults

for

sele

cted

her

bici

des

and

six

met

abol

ites

in s

ampl

es c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

ncentrations

oD

ate

of

coll

ec-

Map

tl

on

no.

(mon

th/

(fig

. 1)

Res

ervo

ir n

ame

day/

year

)

Sam

pl

e ty

pe

Ala

- ch

lor

Ala

- ch

lor

ESA

(ng/D

Am

e-

tryn

(H

9/L)

Atr

a-

zine

(ng/L

)D

EAD

IA

(M9/

L)

Cya

n-

azin

e (H

9/L)

Cya

n-

azin

e am

ide

(M9/L

)

De-

et

hyl-

cy

an-

azin

e (M

9/L)

De-

et

hyl-

cy

an-

azin

e am

ide

(M9/

L)

Met

ol-

achl

or

(H9/

L)

Met

ri-

buzi

n (M

9/L)

Prom

e-

ton

(M9/

L)

Pro

pa-

zine

(M

9/L)

Sim

a-

zine

(ng/L

)OT

N

orth

Dak

ota

1 S X (D

& O a __ z 1 o a (D £ ST O1 0 I 0) 3 a z ^ S sr 3 O 1 -» 5 3 £ 1 5 a S S 5 JD 0 3

58

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stem

Res

ervo

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05/0

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5/92

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5/92

10/2

6/92

01/2

1/93

05/0

4/93

07/1

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09/0

9/93

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59

Alu

m C

reek

Lak

e 05

/05/

92

__

07

/20/

92

07/2

0/92

09/0

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11/0

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01/2

0/93

03/2

5/93

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5/93

07/0

1/93

09/2

7/93

60

Dee

r C

reek

Lak

e 05

/04/

92

07/3

0/92

09/0

9/92

09/0

9/92

10/1

4/92

S BD

S LD

S S S S S S LD

S S LD S S S S LD

S S S S S LD

S

<0.0

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

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6

.07

.09

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6

.07

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0

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±4 1.8

3.3

2.7

3.7

2.5

2.4

1.4

3.4

2.9

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2.0

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<.05

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7.0

8

.08

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7

.07

.06

.13

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.08

.07

.09

.07

Tab

le 5

. A

naly

tical

res

ults

for

sel

ecte

d he

rbic

ides

and

six

met

abol

ites

in s

ampl

es c

olle

cted

fro

m 7

6 re

serv

oirs

in t

he M

idw

este

rn U

nite

d S

tate

s, A

pril

1992

thro

ugh

Sep

tem

ber

1993 C

ontin

ued

Dat

e of

co

llec-

M

ap

tion

no.

(mon

th/

(fig.

1)

Res

ervo

ir na

me

day/

year

)

Sam

- pi

e ty

pe

Ala

- ch

lor

(H9/

L)

Ala

- ch

lor

ESA

(ng/D

Am

e-

tryn

(H

9/L)

Atra

- zi

ne(ng

/L)

DEA

(H9/

L)D

IA

(H9/

L)

Cya

n-

azin

e (H

9/L)

Cya

n-

azin

e am

ide

(H9/

L)

De-

et

hyl-

cy

an-

azin

e (H

9/L)

De-

et

hyl-

cy

an-

azin

e am

ide

(ng/L)

Met

ol-

achl

orM

etri-

bu

zin

Prom

e-

ton

(H9/

L)

Prop

a-

zine

(H

9/L)

Sim

a-

zine

(H

9/L)

Ohi

o C

ontin

ued

> S. I 3) | i 3" 8 S S z 1 o Q. 8 0>

0.

CO X f IT

O I > n _t 3 CO 7

CO JJ ? i

60

Dee

r Cre

ek L

ake

10

/14/

92C

ontin

ued

01/1

2/93

03/2

6/93

07/1

2/93

09/2

9/93

09/2

9/93

61

Del

awar

e L

ake

05/0

5/92

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0/92

08/1

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0/92

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62

Dill

on L

ake

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7/92

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10/1

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01/1

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03/2

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07/0

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09/2

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63

Hoo

ver R

eser

voir

05

/06/

92

07/2

0/92

09/0

8/92

11/0

4/92

01/2

0/93

LD S S S S LD S S S S S S S S S S S S S S S S S S S S S

<0.0

5.0

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05 .30

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3

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05 .27

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05 .06

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1.5 .7

3

3.6

3.9

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51.

1 .95

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7

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9

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00

00

Tabl

e 5.

A

naly

tical

res

ults

for

sele

cted

her

bici

des

and

six

met

abol

ites

in s

ampl

es c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il

Concentrations o

April 1992

Throuc 3

1 f! IK g" i Jo

(0 5

.W

Q

,

_ (D 3- oj 2 sr U1 o i? JA 0) Q.

Z S' M 5" O H | I s (D n i

1 *J<

JC-

IIII

WU

VJII

<

JC

pl&

l 1 ll

^^l

1 C

/C/V

J W

WI

Illl

lU

t

Dat

e of

co

llec-

M

ap

tion

Sam

- no

, (m

onth

/ pi

e (fi

g. 1

) R

eser

voir

nam

e da

y/ye

ar)

type

*\*

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- ch

lor

Ala

- ch

lor

ESA

Am

e-

tryn

Atra

- zi

ne

(H9/

L)DE

ADI

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9/L)

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n-

azln

e

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C

yan-

et

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azin

e cy

an-

amid

e az

ine

(H9/

L)

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L)

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et

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cyan

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ine

amid

e (H

9/L)

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achl

orM

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zin

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e-

ton

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L)

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9/L)

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o C

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63

Hoo

ver R

eser

voir

03

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93

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ontin

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S

64

Milt

on R

eser

voir

05/1

1/92

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07/0

7/92

S

08/1

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S

10/2

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10/2

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01/1

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04/2

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S

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S

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S

_ _

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65

O'S

haug

hnes

sy

05/0

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ervo

ir 06

/30/

92

S08

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92

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92

S12

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92

S

03/2

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06/2

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e 5.

A

naly

tical

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and

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Tabl

e 5.

A

naly

tical

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for

sele

cted

her

bici

des

and

six

met

abol

ites

in s

ampl

es c

olle

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from

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rese

rvoi

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ted

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tes,

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il

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ame

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3

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Tabl

e 5.

A

naly

tical

res

ults

for

sele

cted

her

bici

des

and

six

met

abol

ites

in s

ampl

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olle

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m 7

6 re

serv

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e M

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rn U

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d S

tate

s, A

pril

1992

thro

ugh

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tem

ber

1993

Con

tinue

d

Dat

e of

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ap

tion

no.

(mon

th/

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. 1)

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ervo

ir n

ame

day/

year

)

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pl

e ty

pe

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lor

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lor

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(ng/L]

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in

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05

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<.10

<.

05

<.10

<.

05

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<.

05

<.10

<.

05

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05

0.21 .2

1

.22

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0<.

05

<.05

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<.05

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7

.16

<.05

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6

.15

<.05 .0

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

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05

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DIA

> (H

9/L)

Con

tinu

ed

0.05 .0

8

.08

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05

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05

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Cya

n-

azin

e

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5.2

5

.19

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05

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05

<.05

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<.05

<.05

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Cya

n-

azin

e am

ide

-- 0.09

<.05 .1

0-- -- <.

05

<.05

<.05

-- - <.05

<.05

<.05

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05

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et

hyl-

cy

an-

azin

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5

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<.05

- -- <.05

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05

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De-

et

hyl-

cy

an-

azin

e am

ide

(ng/L)

- <0.5

0

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<50 -- - <.50

<.50

<.50

-- -- <.50

<.50

<.50

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50

<.50

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<.50

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<.50

Met

ol-

achi

or

<0.0

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05

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05

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05

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Met

ri-

buzi

n (W

J/L)

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05

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05

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05

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a-

zine

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05

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a-

zine

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05

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JS Ta

ble

5.

Ana

lytic

al r

esul

ts fo

r sel

ecte

d he

rbic

ides

and

six

met

abol

ites

in s

ampl

es c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il>

0

73

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. 3

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ro 3

? 3

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p_

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c 5* § 5" 0 c 1 3

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d

1 £7f7

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Dat

e of

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c-M

ap

tion

no.

(mon

th/

(fig

. 1)

Res

ervo

ir n

ame

day/

year

)

II I

UI

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Sam

pl

ety

pe

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Ala

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lor

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9/L)

Prop

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9/L)

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a-zi

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)

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cons

in C

onti

nued

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e 77

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Sprin

g V

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y L

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S S S S S S S S S S S S LD S S S S

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<0.0

5.0

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.13

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8

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5

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6.0

7

.06

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5.0

5

<0.0

5

<05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

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6<.

05

Tabl

e 6.

A

naly

tical

res

ults

for

sele

cted

her

bici

des

and

six

met

abol

ites

in s

ampl

es c

olle

cted

from

top

and

botto

m o

f 17

res

ervo

irs in

the

Mid

wes

tern

U

nite

d S

tate

s, A

pril

1992

thro

ugh

Sep

tem

ber

1993

[ESA

, eth

ane

sulfo

nic

acid

; DEA

, dee

thyl

atra

zine

; DIA

, dei

sopr

opyl

atra

zine

; fig

/L, m

icro

gram

s pe

r lite

r; ,

no

data

; <, l

ess

than

. Pr

omet

ryn

and

terb

utry

n w

ere

not d

etec

ted]

Map

no

. (f

ig. 1

) R

eser

voir

nam

e

Dat

e of

co

llec

tio

n (m

onth

/ da

y/ye

ar)

Sam

pl

e A

lach

lor

type

(u

g/L)

Ala

chlo

r ES

A

(ug/

L)A

met

ryn

(ug/

L)A

traz

ine

DEA

(ug/L

)D

IA(ug

/L)

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n-

azin

e (u

g/L)

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na-

zine

am

ide

(ug/

L)

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thyl

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ana-

zi

ne

(ug/

L)

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thyl

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ana-

zi

ne

amid

e (u

g/L)

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ol-

achl

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g/L)

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ri-

buzl

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g/L)

Prom

e-

ton

(ug/

L)

Prop

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ine

(ug/

L)

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ine

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Illin

ois

1 8 31 c_ 8 5 a. § a 31 | 5 TO i

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4 L

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ur

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miU

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08/1

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08/1

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08/1

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top

<0.0

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ttom

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05

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top

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botto

m

<.05

top

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botto

m

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top

<.05

botto

m

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top

.37

botto

m

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top

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m

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top

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-- -- 2.5

2.4 .9

3

2.0

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6-- 7.0

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3.8

4.1 1.0 .98

1.7

1.7

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1.5

1.2

1.1

4.2

3.3

5.5

5.2

2.1

2.0

0.63 .7

2

.38

.35

.45

.44

.54

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0.32 .3

3

.20

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Indi

ana

1.1

.81

.87

1.3

1.3

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a.5

0 .4

2

.53

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6

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2.1 1.0

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0.28 .3

4

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1.5

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1.1 .5

3.6

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0

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to co

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mon

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2 Ta

ble

6.

Ana

lytic

al r

esul

ts fo

r se

lect

ed h

erbi

cide

s an

d si

x m

etab

olite

s in

sam

ples

col

lect

ed fr

om to

p an

d bo

ttom

of

17 r

eser

voirs

in th

e M

idw

este

rn

Concentrations

April 1992

Thro <§ 3

.</

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CT z

Jo ~

to £

2."f X o

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1 i

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Ill

tst

Map

no

.

34 36 40 48 57 59--

62 69

j <

_>ic

ti^o

, n|ji

ii ic

Res

ervo

ir n

ame

Cro

ss L

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Qui

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voir

Win

nibi

gosh

ish

Res

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ir

Bra

nche

d O

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Will

ow C

reek

Res

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Alu

m C

reek

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e

Dill

on L

ake

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Men

dota

I<JC

- 11

II

VJU

Dat

e of

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llec

tio

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onth

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08/1

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08/1

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chlo

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2

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Met

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<.05

<.05

Prom

e-

ton

<0.0

5<.

05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

Prop

- az

ine

<0.0

5

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

Sim

- az

ine

<0.0

5<.

05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .1

3

.17

.15

.14

<.05

<.05

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0

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03 (U

Deethylcyanaz

Herbicide Compounds Analyzed and Percentage Detections, April 1992 Through September 1993 95

> o

o

o

Tabl

e 8.

Phy

sica

l pro

perti

es a

nd a

naly

tical

res

ults

for

nutri

ents

col

lect

ed fr

om 7

6 re

serv

oirs

in th

e M

idw

este

rn U

nite

d S

tate

s, A

pril

1992

thro

ugh

Sep

tem

ber

1993

[(iS

/cm

, m

icro

siem

ens

per c

entim

eter

at 2

5 de

gree

s C

elsi

us; °

C, d

egre

e C

elsi

us; m

g/L

, mill

igra

ms

per l

iter;

<, le

ss th

an;

, no

dat

a]

rations

of

Selected

)2

Through

Septemi If il "f X 1 0 i | Q

.Z i 5 Sf

w 5* 0 1 3 3 i Q

. a i 5 31 i O 5

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (f

ig. 1

) R

eser

voir

nam

e ye

ar)

1 C

arly

le L

ake

04/3

0/92

06/2

4/92

08/2

5/92

10/2

1/92

01/1

3/93

03/3

0/93

07/1

5/93

09/2

0/93

2 C

rab

Orc

hard

Lak

e 05

/01/

9206

/25/

9208

/27/

9210

/22/

9201

/15/

93

03/2

6/93

07/0

7/93

09/2

1/93

3 D

evils

Kitc

hen

Lak

e 05

/01/

9206

/25/

9208

/27/

9210

/22/

9201

/15/

93

Col

lec

tio

n tim

e (2

4-

hour

)

1030

1415

1000

1450

1400

1210

1230

0930

0945

3445

1140

1030

1130

1510

1000

0900

1100

1245

1410

1250

1515

Spec

ific

Wat

er

cond

uct-

te

mpe

ra-

ance

tu

re

(US/

cm)

(°C

)

420

466

491

495

396

387

417

358

268

333

418

327

308

270

269

287

107

164

211

134

131

Illin

ois

13.5

24.0

25.0

15.5 2.0

10.0

28.0

21.5

16.0

25

^23

.517

.0 4.0

7.0

28.5

20.0

18.0

22.0

22.5

17.0 4.5

PH

(sta

ndar

d un

its)

7.7

7.5

7.8

7.9

7.6

8.3

7.8

7.4

7.9

7,5

7.6

8.2

7.6

7.5

7.7

8.4

7.9

7.0

7.6

7.5

8.2

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

0.35 .1

1<.

05<.

052.

3

3.7 .4

7.3

8

.05

.34

.11

<.05 .1

1

.05

<.05 .2

6

.05

.07

.08

<.05 .0

6

Nitr

ite a

s ni

trog

en

(mg/

L)

0.02 .0

7.0

1<.

01 .03

.03

.01

<.01

<.01 .09

^

.01

<.01 .0

1

.01

<.01 .0

2

.01

.01

.01

<.01 .0

1

Ort

ho-

Am

mo-

ph

osph

ate

nium

as

as p

hos-

ni

trog

en

phor

us

(mg/

L)

(mg/

L)

0.17 .1

7.1

4.0

2.1

1

.03

.12

.04

.03

.36

.02

.01

.07

<.01 .0

6.2

0

.02

.79

.04

.03

.09

0.07 .1

5.1

7.0

9.1

1

.06

.19

.18

.01

.64

.01

<.01

<.01 .0

1<.

01 .01

.01

.01

.01

.01

<.01

Silic

a as

Si

02(m

g/L)

2.3

3.4

2.5 .8 5.2

5.7

4.6

3.4 .5 2.1

4.6 .6 2.9 .1 1.7

7.9

4.1

7.8

2.0

3.6

4.4

Tabl

e 8.

Phy

sica

l pro

perti

es a

nd a

naly

tical

res

ults

for

nutri

ents

col

lect

ed fr

om 7

6 re

serv

oirs

in th

e M

idw

este

rn U

nite

d S

tate

s, A

pril

1992

thro

ugh

Sep

tem

ber

1993

Con

tinue

d

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (f

ig. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

W

ater

co

nduc

t-

tem

pera

- an

ce

ture

(^

S/cm

) (°

C)

pH

(sta

ndar

d un

its)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Ort

ho-

Am

mo-

ph

osph

ate

nium

as

as p

hos-

ni

trog

en

phor

us

(mg/

L)

(mg/

L)

Silic

a as

Si

O2

(mg/

L)Il

lino

is C

ontin

ued

-o f 8 o

3 §. g 1 3 9L cT

SL 8 sr ^ i 1 Sf f 10 3 (Q 3- s?

3 D

evils

Kitc

hen

Lak

e

03/2

6/93

Con

tinue

d 07

/07/

9309

/21/

93

4 L

ake

Dec

atur

04

/30/

9207

/07/

9209

/01/

9210

/20/

9201

/14/

93

03/2

4/93

07/0

7/93

09/0

9/93

5 L

ake

Shel

byvi

lle

04/3

0/92

07/0

7/92

08/2

5/92

10/2

0/92

01/1

4/93

03/2

6/93

07/1

2/93

09/0

8/93

1300

1420

1130

0900

1200

1015

1000

1045

1045

1215

1700

1040

1255

1500

1115

1315

1445

1100

0915

112

100 90 790

543

589

482

490

565

348

512

475

497

479

430

492

531

449

395

5.5

30.0

23.0

14.5

24.0

22.5

12.5 .5 5.0

25.5

24.0

14.0

20.5

24.0

14.0 2.0

7.0

23.0

22.0

6.9

6.8

8.0

7.5

8.0

7.8

8.1

8.0

8.1

7.8

8.1

8.0

7.8

7.3

7.7

7.8

8.5

7.8

7.9

0.11 .0

7<.

05

6.2

5.1

2.9 .4

26.

9

8.5

5.5

3.3

1.2

1.6

2.9

2.1

6.2

8.2

4.9

2.5

0.01

<.01

<.01 .0

8.0

7.0

5.0

2.0

3

.02

.05

.03

.02

.03

.21

.07

.05

.03

.12

.07

0.01 .0

5.0

2

.09

.03

.02

.06

.05

.01

.05

.04

.02

.24

.15

.02

.10

.02

.14

.16

0.01

<.01

<.01 .0

2.0

2.0

3.0

6.1

3

.04

.14

.11

<.01

<.01

<.01

<.01 .1

4

.04

<.01

<.01

4.4

3.1

1.7

241.

611

.4 8.3

7.5

9.5

11

.2 1.0

2.3 .2 8.7

6.2

1.4

1.2

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

2.

3-8 <O

3

to *

*Si ? §

M

ap n

o.

(o 3

, (f

ig-

1)

Res

ervo

ir n

ame

«|

"So

6 L

ake

Ver

mill

ion

||l|

(S

H

W

Q. « (0 3- o ff 1 cr o sr

8 7

Litt

le G

rass

y L

ake

0) Q. z Sr

5' I 5" O S i 3 3 S 8 8

Ren

d L

ake

1 S I 5

Dat

e of

co

llect

ion

(mon

th/d

ay/

year

)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

W

ater

co

nduc

t-

tem

pera

- PH

an

ce

ture

(s

tand

ard

(|iS/

cm)

(°C

) un

its)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

Ort

ho-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L)Il

linoi

s C

ontin

ued

04/3

0/92

07/0

7/92

08/2

8/92

10/2

1/92

01/1

3/93

03/1

7/93

07/0

6/93

09/0

2/93

05/0

1/92

06/2

5/92

08/2

7/92

10/2

2/92

01/1

5/93

03/2

6/93

07/0

7/93

09/2

1/93

04/3

0/92

06/2

4/92

08/2

4/92

10/2

1/92

01/1

1/93

1515

1200

1345

0830

1050

0930

1200

1045

1145

1345

1535

1400

1330

1130

1150

1230

0800

1000

1230

1120

1440

617

578

538

562

428

499

319

407 91 93 106

116

130

106 83 95 389

365

470

590

469

14.5

24.0

23.5

13.5 1.5

2.5

25.5

27.0

18.0

26.5

24.0

21.0 5.5

7.0

29.5

23.0

14.5

22.0

24.5

13.0 3.0

8.2

8.1

8.1

7.7

8.0

7.9

7.8

8.0

8.1

7.4

7.8

7.4

7.0

6.9

7.8

7.3

7.3

7.1

6.9

7.3

7.5

14.0 9.3

4.9

1.1

5.0

7.0

4.7

1.2 .0

5.0

5.0

5<.

05 .11

.12

.05

<.05 .0

5.4

1.6

2.5

3.0

9

0.07 .0

5.0

6.0

3.0

2

.01

.07

.03

.01

.01

.01

<.01 .0

1

.01

.01

<.01

<.01 .0

2.0

6.0

2<.

01

0.01 .0

1.0

2.0

4.0

7

.06

.08

.06

.19

.02

.02

.05

.05

.02

.02

.02

.03

.14

.33

.04

.02

0.02

<.01

<.01

<.01 .1

0

.07

.13

.02

.01

.01

.01

.01

<.01 .0

1.0

1<.

01 .01

.12

.18

.12

.01

5.7

6.3

8.5

4.1

7.1

7.3

9.0

1.0 .3 .9 1.9

<.l .1 1.0

3.7 .6 3.0

4.2

1.9 .8

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (fi

g. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

cond

uct

an

ce

(liS/

cm)

Wat

er

tem

pera

tu

rePH

(s

tand

ard

units

)

Nitr

ite

plus

ni

trate

as

nitro

gen

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

Orth

o-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L)Il

linoi

s C

ontin

ued

o 3- i o

B I 8 0) K I 8 I c 5? 0 S* 1 TO 3[ H (O 3

1 ,

8 R

end

Lake C

ontin

ued

03/2

4/93

07/0

7/93

09/2

0/93

9 B

rook

ville

Lak

e 05

/07/

9207

/13/

9208

/19/

9210

/23/

9201

/06/

93

03/2

4/93

07/0

8/93

09/0

7/93

10

Cat

arac

t Lak

e 05

/04/

9207

/11/

9208

/24/

9210

/21/

9201

/14/

93

03/2

2/93

07/0

7/93

09/0

2/93

1230

1645

1330

0830

0730

1330

1300

1315

1215

1515

1015

1730

2015

1540

1300

1115

1200

1330

0900

381

363

386

516

530

528

519

488

511

499

540

390

406

313

365

388

386

381

382

5.0

28.0

21.0

Indi

ana

13.5

13.5

14.0

13.0 5.5

7.0

12.5

16.0

15.0

21.5

25.0

16.0 3.0

3.0

22.5

24.0

7.0

7.1

7.0

8.4

8.0

7.6

7.6

8.3

7.4

7.5

7.5

7.9

7.6

7.8

8.0

8.1

8.2

7.4

7.6

0.05 .1

0.3

9

1.1 .8

8.1

4.2

21.

5

1.2

2.0

1.4

3.3

1.4

1.4 .6

12.

7

3.5

2.6 .4

2

0.01

<.01 .0

3

<.01 .0

2.0

1.0

1.0

2

.01

.05

.12

.05

.08

.05

.05

.03

.01

.11

.05

0.01 .0

6.1

7

.01

.06

.08

1.3 .0

4

.04

.14

.29

.09

.40

.13

.15

.13

.11

.42

.16

0.01 .0

4.0

6

<.01

<.01 .0

1.0

7<.

01

<.01

<.01

<.01 .0

4<.

01<.

01<.

01 .05

.03

<.01 .0

7

0.2

2.8

3.5 .8 2.9

7.0

2.9

1.9

4.2

2.7

2.9

4.8

3.8

4.8

4.6

2.7

7.1

6.1

3.8

o la

uie

o.

rnys

iuai

pro

pert

ies

ant

>0

Sep

tem

ber

199

3 C

ontin

ued

n

o it 10 3

H =f §

Map

no.

(§ o

(fi

g- 1

) R

eser

voir

nam

e

i ana

iyii

uai

res

Dat

e of

colle

ctio

n(m

onth

/day

/ye

ar)

uus

iur

MU

Col

lec

tion

time

(24-

hour

)

men

is u

unt

Spec

ific

cond

uct

ance

(|iS/

cm)

;uie

u nu

m ,

Wat

erte

mpe

ra

ture

(°C

)

ro r

eser

voir

:

PH(s

tand

ard

units

)

5 in

me

ivnu

Nitr

itepl

usni

trat

e as

nitr

ogen

(mg/

L)

iwes

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ui m

eu o

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s,M

prn

i»»<

£

Ort

ho-

inro

ugn

Am

mo-

ph

osph

ate

Nitr

ite a

sni

trog

en(m

g/L)

nium

as

nitr

ogen

(mg/

L)

as p

hos

phor

us(m

g/L)

Silic

a as

Si0

2(m

g/L)

(/> J

B In

dian

a C

ontin

ued

"5 o

11

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gle

Cre

ek R

eser

voir

| |

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to S

. u

5! _ <D 31 o_' s i O1 p_ |f

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tingt

on L

ake

0> 3 Q.

Z c 5' 3

5f 3" O | i 3 3 I 8

13

Lake

Sha

fer

I s 5.' I i 3) <D

0>

05/0

4/92

07/0

6/92

08/2

7/92

10/2

7/92

01/0

7/93

03/2

9/93

07/0

8/93

09/0

3/93

05/0

5/92

07/1

4/92

08/2

6/92

10/2

7/92

01/1

1/93

03/2

3/93

07/0

9/93

09/1

6/93

05/0

5/92

07/1

4/92

08/2

6/92

10/2

6/92

01/1

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0915

1300

1120

1445

1300

1045

0930

0900

1730

1300

1730

0915

1230

1545

1715

1130

1030

1315

1000

1230

1130

528

462

465

439

464

459

455

397

572

435

552

610

458

545

310

520

628

574

578

564

560

14.5

24.5

22.0

14.5 5.0

7.0

22.0

25.5

14.5

23.5

22.5

11.5 2.0

4.5

24.0

20.5

15.5

24.5

24.0

12.0 .5

8.6

7.2

7.5

8.0

8.0

8.1

7.8

7.6

8.1

7.5

7.6

7.9

7.5

8.3

7.4

7.5

8.0

7.8

7.8

8.0

7.4

6.5

3.8

1.6

1.8

2.5

3.7

2.1

<.05

9.1 8.0 .4

12.

94.

3

3.7

6.6 .4

3

3.5

3.6 .3

52.

44.

0

0.07 .1

4.1

5.0

7.0

3

.03

.12

.01

.13

.28

.06

_ _

_

_

.05

.06

.03

.32

.03

.03

.06

.02

.02

.03

0.06 .1

71.

1 .04

.10

.02

.03

.26

.11 .18

.80

_

_ _.

..._

.19

.22

.20

.16

.26

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.15

.10

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.07

0.01

<.01 .0

2<.

01 .08

<.01

<.01

<.01 .1

4.0

9.1

2

.06

.28

.06

.18

.04

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5<.

01 .02

.04

3.7 .7

4.3

2.9

5.8

4.2

2.2

3.4

8.0

_ 5.3

7.5

6.9

5.1

5.6 .8 4.3

11 7.5

9.9

8.1

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93-^

Con

tinue

d

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (fi

g. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

cond

uct

an

ce

Wat

er

tem

pera

tu

repH

(s

tand

ard

units

)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Orth

o-

Am

mo-

ph

osph

ate

nium

as

as p

hos-

ni

trog

en

phor

us

(mg/

L)

(mg/

L)

Silic

a as

Si

O2

(mg/

L)In

dian

a C

ontin

ued

o w 8 o 5 "8 n a. 0 w CD Q.

1 I g SL 3D i s? s- z 5* 1 o (O I <| w 9 a » 3

13

Lak

e S

haf

er C

ontin

ued

03/2

3/93

07/1

2/93

09/0

3/93

14

Man

sfie

ld L

ake

05/0

4/92

07/1

1/92

08/2

4/92

10/2

1/92

01/1

2/93

03/2

2/93

07/1

0/93

09/1

5/93

15

Mis

siss

inew

a L

ake

05/0

4/92

07/1

4/92

08/2

6/92

10/2

6/92

01/1

1/93

03/2

3/93

07/0

9/93

09/1

5/93

0930

1300

1515

1730

1700

1150

1000

1530

1445

1500

1200

1730

1700

1400

1615

1730

1215

1430

1700

539

575

573

529

545

467

421

448

444

451

373

444

422

335

505

430

396

443

417

4.5

27.0

23.0

12.5

14.5

21.0

15.0 4.0

3.0

19.0

22.0

13.5

21.5

23.5

11.5 2.0

2.5

22.0

22.0

8.1

8.2

7.8

8.2

7.8

7.4

8.0

7.7

8.5

7.7

7.3

7.9

7.5

7.9

7.9

7.4

8.1

7.4

7.5

4.1

2.2

1.1

4.6

3.6

2.6

2.2

2.6

4.3

1.9 .4

7

5.6

5.5

1.4

2.5

2.1

3.3

4.4

1.2

0.02 .0

3.0

3

.05

.10

.04

.19

.04

.02

.03

.04

.08

.12

.04

.05

.04

.02

.08

.16

0.07 .0

5.1

9

.17

.61

.49

.09

.19

.20

.42

.79

.18

.06

.08

.27

.15

.15

.04

.07

0.02 .0

1.0

6

<01

<.01

<.01

<.01 .0

4

.04

<.01 .0

1

.10

.07

<.01 .0

6.1

0

.10

.05

.02

6.1

9.0

7.1

2.5

3.8

6.2

3.6

6.9

6.2

3.6

3.2

5.2

3.8

3.6

7.8

7.9

6.1

5.3

2.8

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

Ss ni g §

Map

no.

,§

o (f

ig-1

) R

eser

voir

nam

e

vf "So

16

Mon

roeL

ake

CD

MI

2-

- 1

(O

O"

8- » o" s- i | jf

17

Mor

se R

eser

voir

D> Z

- ..._

____

(5* 1 3 O i 1 ! f

18

Pato

kaL

ake

a S

a. i § s (D i

Dat

e of

co

llect

ion

(mon

th/d

ay/

year

)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

W

ater

co

nduc

t-

tem

pera

- PH

an

ce

ture

(s

tand

ard

(liS

/cm

) (°

C)

units

)

Nitr

ite

plus

ni

trat

e as

N

itrite

as

nitro

gen

nitro

gen

(mg/

L)

(mg/

L)

Orth

o-

Am

mo-

ph

osph

ate

nium

as

as p

hos-

ni

trog

en

phor

us

(mg/

L)

(mg/

L)

Silic

a as

Si

02(m

g/L)

Indi

ana C

ontin

ued

05/0

6/92

07/0

7/92

08/2

5/92

10/2

1/92

01/1

3/93

03/2

5/93

07/0

8/93

09/0

1/93

05/0

7/92

07/0

6/92

08/2

5/92

10/2

7/92

01/0

7/93

03/2

9/93

07/0

9/93

09/0

3/93

05/0

6/92

07/0

7/92

08/2

5/92

10/2

2/92

01/1

3/93

1200

1115

0800

1600

1615

1045

1900

1200

1230

1540

1715

1230

1105

1530

1000

1200

1520

1500

1145

1000

1415

190

193

196

205

186

190

186

186

484

328

419

446

447

446

446

400

226

220

226

228

200

14.5

23.0

24.5

16.0 3.5

4.0

24.0

25.5

16.0

25.0

2M 14.0 4.0

9.0

27.0

25.5

14.5

25.5

26.0

15.5 4.0

7.5

7.0

7.0

7.5

7.0

7.8

7.0

7.2

8.8

7.6

-7JB 8.

48.

2

8.1

8.2

8.0

8.0

8.2

8.2

7.6

7.4

0.06

<0

.01

<.05

<.

01<.

05

<.01

.07

<.01

.11

<.01

.25

<.01

<.05

<.

01<.

05

.03

8.7

.06

5.3

.17

3,0

.06

2.8

.114.

8 .0

4

6.3

.03

2.6

.06

1.7

.03

.26

<.01

<.05

<.

01<.

05

<.01

<.05

<.

01.1

4 .0

2

0.03

<0

.01

.04

<.01

.09

<.01

.10

<.01

.02

<.01

.02

<.01

.13

<.01

.21

.02

<.01

.0

1.0

2 .01

.07

<.01

.03

<.01

.08

.07

.05

.03

.04

.01.0

8 <.

01

.04

<.01

.03

<.01

.04

<.01

.26

<.01

.09

<.01

1.5

1.9

3.6

3.8

1.5

3.3

3.2

4.3

4.0

2.5

4.9

1.5

6.3

5.4

2.0 .9 .9 .4 1.2

1.8

8.7

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nut

rient

s co

llect

ed fr

om 7

6 re

serv

oirs

in th

e M

idw

este

rn U

nite

d S

tate

s, A

pril

1992

thro

ugh

Sep

tem

ber

1993

Con

tinue

d

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (f

ig. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

Wat

er

cond

uct-

te

mpe

ra-

ance

tu

re

(uS/

cm)

(°C)

PH

(sta

ndar

d un

its)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

Orth

o-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L)In

dian

a C

ontin

ued

TJ f

8 | s. 8 0) 0. 1 5 o 2. 30 I S> ^ z i i 1 i (D #

18

Pato

ka L

ake

Con

tinue

d 03

/25/

9307

/13/

9309

/14/

93

19

Sala

mon

ie L

ake

05/0

5/92

07/1

4/92

08/2

6/92

10/2

6/92

01/1

1/93

03/2

3/93

07/1

2/93

09/1

6/93

20

Cor

alvi

lle L

ake

04/2

9/92

06/3

0/92

08/2

4/92

10/1

9/92

01/2

0/93

03/2

4/93

07/1

6/93

09/0

1/93

0800

1145

1200

1530

1600

1550

1730

1600

1415

1630

0930

1330

1230

1745

1200

1000

1045

1552

1300

203

150

233

465

422

413

452

403

427

389

356

548

562

590

505

660

347

394

377

4.0

23.5

23.0

12.5

20.0

23.0

12.0 2.5

2.0

22.5

21.5

Iow

a

12.0

23.5

23.5

10.5 .5 1.0

23.0

24.5

8.2

7.4

7.3

8.1

7.6

7.9

7.9

7.5

8.2

7.6

7.5

8.0

8.4

8.2

8.3

8.1

7.7

7.6

8.2

0.22 .1

3<.

05

5.4

5.4

2.5 1.6

2.4

2.9

5.2

1.2

9.9

6.0

5.5

3.0

7.8

2.7

4.5

3.4

<0.0

1<.

01<.

01 .06

.36

.12

.04

.04

.02

.23

<.01 .0

4.1

5.0

8.2

7.0

4

.04

.19

.22

0.04 .1

5.0

6

.15

.33

.29

.12

.29

.19

.12

.03

.04

.18

.20

.13

.16

.71

.05

.04

<0.0

1<.

01<.

01 .07

.05

.03

.03

.06

.13

.09

.02

.12

.09

.13

.05

.09

.29

.13

.12

1.6

1.5

1.5

4.4

4.4

5.4

4.5

7.2

5.6

5.0

4.3

14 12 10 4.9

16 9.8

13 14

8

> o

o

o

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

"

O

<n

« »

ro 3

H g |

Map

no.

10

8,

(fig-

1)

Res

ervo

ir n

ame

Dat

e of

co

llect

ion

(mon

th/d

ay/

year

)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

W

ater

co

nduc

t-

tem

pera

- an

ce

ture

pH

(sta

ndar

d un

its)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Am

mo-

N

itrite

as

nium

as

nitr

ogen

ni

trog

en

(mg/

L)

(mg/

L)

Ort

ho-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L)(0

«?

Iow

a C

ontin

ued

"5 H

. 21

La

ke P

anor

ama

A

5T3

&

I 3

-<§

o| « (D oj » i CT 2. f

22

Lake

Red

Roc

kn> 0. z £ 5- a 5"

O 3 h £

23

Rat

hbun

Lak

e1 5! I ? 3 3) O «

04/3

0/92

06/3

0/92

08/2

5/92

10/1

6/92

01/2

2/93

03/2

2/93

07/2

7/93

08/3

1/93

04/3

0/92

07/0

1/92

08/2

5/92

10/1

3/92

01/2

1/93

03/2

3/93

07/1

6/93

08/3

0/93

04/3

0/92

07/0

2/92

08/1

2/92

10/1

4/92

01/2

1/93

1740

1800

0930

0745

0900

1615

1715

0810

1200

1100

1615

1445

1500

0935

1305

1700

1700

0900

1530

0720

1215

612

548

547

574

735

290

568

508

540

600

598

434

756

445

425

509

247

251

250

169

178

11.5

26.5

23.0 8.5 .5 2.0

23.0

22.0

10.0

22.5

23.5

18.0 1.0

1.5

23.0

25.0

10.5

23.0

24.0

17.0 2.0

8.2

8.5

8.2

8.6

8.1

7.7

8.0

8.2

8.2

8.5

8.2

8.2

8.0

7.8

7.7

8.5

7.9

8.0

7.9

8.2

7.7

10 8.2

5.6

5.1

10 1.9

7.6

5.9

8.3

7.8

6.3

2.3

9.0

3.3

4.5

4.8 .6

1.7

0.3

2.4

7.5

5

0.05 .1

3.1

1.0

8.0

4

.03

.07

.10

.04

.48

.21

.05

.03

.04

.16

.11 .01

.01

.02

.01

.03

0.08 .1

0.3

9.0

7.0

8

.24

.04

.10

.09

.06

.07

.03

.07

.49

.03

.03

.11

.06

.03

.02

.03

0.08 .0

2.0

1.0

3.1

0

.73

.13

.12

.09

.13

.06

.09

.11

.34

.13

.12

.02

.07

.01

.04

.12

-- 1.6

19 3.0

20 9.0

19 17 1.4

10 11 12 20 12 14 19 1.6

2.1 .9 3.8

5.7

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

Map

no.

(f

ig. 1

) R

eser

voir

nam

e

Dat

e of

co

llect

ion

(mon

th/d

ay/

year

)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

co

nduc

t

ance

((

iS/c

m)

Wat

er

tem

pera

tu

repH

(s

tand

ard

units

)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

Ort

ho-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L)Io

wa C

ontin

ued

23

Rat

hbun

Lak

e 3

Con

tinue

da> o 2L T

l

.§

24

Sayl

orvi

lle L

ake

S 0 3

Q.

0_

I 3) <D

CO C ST 0 c 25

C

linto

n La

keS? (D * o 8 ro 5 to 3"

03/2

3/93

07/2

7/93

08/3

0/93

04/3

0/92

06/3

0/92

08/2

5/92

10/1

6/92

01/2

2/93

03/2

2/93

07/1

6/93

08/3

1/93

05/0

1/92

06/2

6/92

08/2

4/92

10/2

6/92

01/1

9/93

03/2

2/93

07/1

3/93

08/3

0/93

1300

1200

1210

1515

2000

1115

1120

1100

1325

1000

1010

0930

0830

1040

1030

1310

1200

1005

1105

188

189

183

666

628

680

703

892

558

460

552

326

320

295

315

290

330

302

251

3.0

23.0

25.0

10.0

23.5

23.5 7.5 1.5

1.5

22.0

23.5

Kan

sas

16.0

21.5

25.5

15.5 3.0

5.5

26.0

27.5

8.5

7.3

7.6

8.2

8.3

8.4

8.6

8.2

8.3

7.7

8.5

8.3

7.9

8.2

8.9

8.8

8.0

8.1

8.0

0.52 .7

4.5

8

12 11 5.9

2.4

9.8

4.3

4.9

7.7 .3

7.2

2<.

05<.

05 .37

.48

.25

<.05

<0.0

1<.

01<.

01 .03

.10

.06

.19

.04

.06

.09

.08

.01

.02

<.01 .0

1.0

2

.01

<.01 .0

1

0.02 .0

3.0

4

.02

.12

.13

.43

.09

.52

.04

.05

.12

.06

.03

.02

.10

.02

.03

.13

0.04 .0

3.0

4

.09

.09

.02

.04

.04

.38

.16

.12

.02

<.01

<.01

<.01 .0

3

<.01

<.01

<.01

6.6

5.0

5.4

19 21 8.5

15 23 16 18 22 8.1 1.4 .7 .7 3.6

4.5

3.8

3.1

o Ta

ble

8. P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h

TJ

0 n ro 3

H

3 §

Map

no.

,§

S (f

i'9-1

) R

eser

voir

nam

e

Dat

e of

co

llect

ion

(mon

th/d

ay/

year

)

Col

lec-

Sp

ecif

ic

tiont

ime

cond

uct-

(2

4-

ance

ho

ur)

(|iS/

cm)

Wat

er

tem

pera

tu

rePH

(s

tand

ard

units

)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

Orth

o-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L){/>

&

Kan

sas C

ontin

ued

"S |

26

Hill

sdal

e La

ke3

&

I i

25 o 0

8- » X i o_ 8- I ?~ 27

K

anop

olis

Lak

e0) a z £ § 5" O i i H |

28

Milf

ord

Lake

s a i 3 0 o 3

05/0

5/92

06/2

5/92

08/2

8/92

10/2

7/92

01/1

1/93

03/2

3/93

07/2

9/93

08/3

1/93

05/0

7/92

06/3

0/92

08/2

7/92

10/2

9/92

01/1

5/93

03/2

6/93

07/0

8/93

09/0

3/93

05/0

5/92

06/2

9/92

08/2

5/92

10/2

9/92

01/1

3/93

1100

1100

1130

1100

1145

1145

1615

1340

1015

1230

0830

0900

0950

0820

1600

0930

1530

1200

1345

1400

1310

336

321

310

326

254

276

270

245

1,25

097

467

289

01,

050

789

935

656

617

660

514

478

535

18.0

22.0

22.5

15.5 2.0

5.0

26.5

25.5

16.0

23.0

22.5

13.0 2.0

6.5

25.5

24.5

15.0

23.0

24.5

14.0 1.5

8.3

7.8

7.8

7.9

8.0

8.5

7.7

7.3

8.3

7.9

8.1

8.0

8.2

8.2

8.0

7.9

8.2

7.8

7.9

8.3

8.7

0.24 .5

3.1

0<.

05 .44

.67

.41

.07

.05

.32

.49

.59

.80

1.0 .51

.10

.08

.21

.62

.83

1.1

0.01 .0

2<.

01<.

01 .02

.01

<.01 .0

1

<.01 .1

0<.

01 .02

.02

.03

.01

.03

<.01 .0

1<.

01<.

01 .01

0.06 .0

6.0

8.0

1.1

1

.06

.05

.46

.05

.06

.02

.05

.05

.13

.06

.12

.10

.12

.03

.01

.06

<0.0

1.0

2.0

1.0

3.0

7

.04

.01

.02

.01

.03

.11 .06

.05

.09

.05

.09

.03

.12

.15

.16

.17

0.8

2.2

1.6 .9 3.9

4.9

2.4

4.0

1.1

5.7

11 12 11 13 9.5

17 1.5

10 9.9

9.3

13

Tabl

e 8.

P

hysi

cal p

rope

rtie

s an

d an

alyt

ical

res

ults

for

nutr

ient

s co

llect

ed f

rom

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 1

99

3 C

on

tinu

ed

Map

no.

(fi

g. 1

) R

eser

voir

nam

e

Dat

e of

co

llect

ion

(mon

th/d

ay/

year

)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

Wat

er

cond

uct-

te

mpe

ra-

ance

*"

» (u

S/cm

) (°

C)

PH

(sta

ndar

d un

its)

Nitr

ite

plus

ni

trate

as

nitr

ogen

(m

g/L)

Nitr

ite a

s ni

troge

n (m

g/L)

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

Orth

o-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

02(m

g/L)

Kan

sas C

onti

nued

28

Milf

ord

Lak

e

3

Con

tinue

dCO 8 1

29

Perr

y L

ake

3 to a. fiL 8 3J (D

CO c_ 1 z 5. 30

Po

mon

a L

ake

1 sr > TJ i =? 3 to V)

9

03/2

4/93

07/1

9/93

09/0

1/93

05/0

1/92

06/2

6/92

08/2

8/92

10/2

6/92

01/1

9/93

03/2

2/93

07/2

5/93

08/3

0/93

05/0

5/92

06/2

5/92

08/2

4/92

10/2

7/92

01/1

1/93

03/2

3/93

07/2

9/93

08/3

1/93

1600

1605

1705

1250

1100

0900

1230

0955

1510

2030

1330

0830

0830

1400

0900

1600

1500

1210

1030

479

472

366

350

361

298

294

365

348

260

249

296

394

330

332

316

335

191

242

5.0

27.0

25.5

14.0

19.0

23.5

17.5 2.0

4.5

25.0

26.0

17.0

21.0

24.0

14.0 2.5

7.5

23.5

26.5

8.2

8.0

7.8

8.0

7.8

8.0

8.6

7.6

8.2

7.8

7.6

8.0

7.8

7.9

8.5

7.9

8.3

7.3

7.9

1.2

1.0 .5

0

.82

.77

.52

.51

.99

.94

1.3 .3

7

.96

.77

.32

.29

.58

.72

.50

.06

0.02

<.01

<.01 .0

2.0

2.0

2<.

01 .02

.02

<.01 .0

2

.04

.01

<.01

<.01 .0

2

.01

<.01

<.01

0.24 .0

4.0

4

.14

.12

.07

.02

.14

.07

.03

.14

.09

.03

.04

.03

.09

.05

.03

.07

0.17 .1

7.2

2

.03

<.01 .0

4.0

5.0

7

.06

.09

.09

.04

.02

.01

.03

.07

.05

.07

.01

12 12 16 2.8

7.4

6.2

7.2

11 10 10 10 5.2

5.7

3.4

3.3

8.1

7.9

9.7

2.8

ff CT

(D

o Ta

bled

. P

hysi

cal

!! S

epte

mbe

r 19

93 C

ontin

ued

and

anal

ytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

thro

ugh

ncentratlons

of

Sel<

ril

1992

Through Se f"0 S _| si co

Q.

CO

Q_ ° <> & i S 1 Q> a z 1 ff 3 O 3 i 3 3 i a a i s 5 « s i

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (fi

g. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

co

nduc

t

ance

(ja

S/cm

)

Wat

er

tem

pera

tu

rePH

(s

tand

ard

units

)

Nitr

ite

plus

ni

trate

as

nitr

ogen

(m

g/L)

Ort

ho-

Am

mo-

ph

osph

ate

Nitr

ite a

s ni

um a

s as

pho

s-

nitr

ogen

ni

trog

en

phor

us

(mg/

L)

(mg/

L)

(mg/

L)

Silic

a as

Si

O2

(mg/

L)K

ansa

s C

ontin

ued

31

Tut

tle C

reek

Lak

e 05

/05/

9206

/29/

9208

/25/

9210

/30/

9201

/13/

93

03/2

4/93

07/1

9/93

09/0

1/93

32

Wac

onda

Lak

e 05

/06/

9206

/29/

9208

/26/

9210

/287

9201

/14/

93

03/2

5/93

07/0

8/93

09/0

2/93

33

Wils

on L

ake

05/0

6/92

06/3

0/92

08/2

6/92

10/2

8/92

01/1

4/93

1200

1000

1115

0830

1145

1150

1220

1150

1000

1630

0915

120(

T09

15

1145

0845

0920

1250

1000

1300

1400

1430

419

517

270

360

562

180

262

221

870

907

703

715

773

780

808

574

4,10

03,

760

3,98

03,

890

3,71

0

15.5

21.5

24.5

13.5 1.5

4.0

24.0

25.5

14.5

25.5

22.0

1471 1.5

4.0

24.0

25.0

15.5

21.0

23.0

16.0 2.5

8.6

8.0

7.8

8.0

8.4

7.8

7.6

7.4

8.3

7.8

8.1

3:3

8.3

7.9

7.8

7.9

8.2

8.0

8.2

8.4

8.4

0.79

1.2 .8

61.

11.

6 .95

2.0 .8

6

.07

.33

.15

.28

.51

.75

.65

.28

<.05 .1

1<.

05 .07

.10

0.01 .0

2<.

01<.

01 .03

.05

<.01

<.01

<.01 .0

4.0

1.O

T.0

2

.02

.12

.03

<.01 .0

2<.

01 .01

.01

0.04 .0

4.0

1<.

01 .09

.62

.03

.05

.04

.19

.06

.03

.08

.21

.05

.06

.01

.07

.05

.03

.06

0.09 .1

3.2

0.1

9.1

7

.16

.15

.21

<.01 .0

4.0

3.0

4.0

2

.06

.03

.13

<.01

<.01

<.01 .0

1<.

01

7.8

7.7

12 12 17 7.8

11 14

.9 4.2

5.9

6.2

7.0

9.3

3.2

14 7.5

7.8

8.7

7.9

9.4

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (f

ig. 1

) R

eser

voir

nam

e ye

ar)

Col

lec-

Sp

ecif

ic

Wat

er

tiont

ime

cond

uct-

te

mpe

ra-

PH

(24-

an

ce

ture

(s

tand

ard

hour

) (u

S/cm

) (°

C)

units

)

Nitr

ite

plus

ni

trat

e as

N

itrite

as

nitr

ogen

ni

trog

en

(mg/

L)

(mg/

L)

Ort

ho-

Am

mo-

ph

osph

ate

nium

as

as p

hos-

ni

trog

en

phor

us

(mg/

L)

(mg/

L)

Silic

a as

Si

O2

(mg/

L)K

ansa

s C

ontin

ued

o w g to 1 H w tt a 3 2 0> 3D c_

w 3- z

c 3 y o jo s 1 (O i>

33

Wils

on L

ake

03

/25/

93C

ontin

ued

07/0

8/93

09/0

2/93

34

Cro

ss L

ake

05/0

5/92

06/1

9/92

08/1

9/92

11/0

5/92

01/2

6/93

03/2

5/93

07/2

1/93

09/0

7/93

35

Gul

l Lak

e R

eser

voir

05/1

3/92

06/3

0/92

08/1

8/92

11/0

3/92

01/0

5/93

03/1

5/93

07/1

3/93

09/2

1/93

1605

1230

1420

1230

1130

1300

0915

0930

0910

1040

1510

1045

0930

1030

1120

0915

1130

1000

3,29

02,

590

1,69

0

143

215

214

244

287

335

169

172

238

210

208

230

250

260

230

233

5.0

25.0

24.5

Min

neso

ta

17.0

18.0

23.5 4.5

1.0

1.0

23.5

20.0

11.0

20.0

20.5 3.0

-- ~ 19.5

14.5

8.2

8.1

7.7

7.7

8.4

8.6

7.6

8.8

7.1

7.3

8.4

8.3

8.5

8.1

8.2

8.0

7.9

8.4

8.0

0.20

<0

.01

.25

.02

.07

.02

.05

<.01

.06

<.01

<.05

<.

01.1

0 <.

01.4

5 .0

3

.56

.01

.10

<.01

.14

.01

.06

<.01

<.05

<.

01<.

05

<.01

<.05

<.

01.0

6 .0

3

.08

<.01

<.05

<.

01<.

05

<.01

0.02

<0

.01

.07

<.01

.15

.04

.02

<.01

.14

.03

.02

<.01

.03

<.01

.16

.01

.11

<.01

.05

.05

.05

.06

.03

<.01

.03

<.01

<.01

<.

01<.

01

<.01

.06

<.01

.01

<.01

.03

<.01

.05

<.01

9.7

9.9

15 5.5

4.7

6.6

6.4

14 16 9.6

12 2.1

2.8

3.3

-- 2.1

2.1

2.3

5.3

o (O

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h

Concentrations

of

Se

April 1992

Throu

gh S IS I* CT -

r If l§ S « 9 3- 0 Q

. 2 tr o X

$ o> Q.

Z ^t O i 8 3 1 S ! 1 3J 1

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (f

ig. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

ti

on ti

me

(24-

ho

ur)

Spec

ific

co

nduc

t

ance

(u

.S/c

m)

Wat

er

tem

pera

tu

repH

(s

tand

ard

unit

s)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

Ort

ho-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L)M

inne

sota

C

onti

nued

36

Lac

Qui

Par

le R

eser

voir

05

/06/

92

06/1

8/92

08/2

0/92

11/0

4/92

01/2

0/93

03/2

4/93

07/2

2/93

09/0

9/93

37

Lee

ch L

ake

Res

ervo

ir

05/1

4/92

07/0

1/92

08/1

9/92

11/0

2/92

01/0

6/93

03/1

6/93

07/1

4/93

09/2

2/93

38

Pine

Riv

er R

eser

voir

05

/13/

92

06/3

0/92

08/1

8/92

11/0

3/92

01/0

5/93

1030

1330

1230

1100

1200

0930

1010

1210

0930

0900

1000

1245

0930

0945

0830

0930

1330

1015

1200

1230

1240

904

384

930

957

1,14

0

1,32

089

488

1

168

260

260

272

290

310

279

258

240

228

202

212

235

14.0

20.5

23.0 1.5

1.0

3.0

22.0

18.5

15.0

16.5

20.5 3.0

0 0 19.0

12.5

12.0

19.0

22.0 3.0

0

8.4

7.5

8.2

8.6

8.7

7.8

7.7

8.2

8.1

8.1

7.9

8.2

8.1

8.1

8.1

8.3

8.4

8.5

8.7

8.1

8.0

0.80

2.1 .1

4.4

9.7

2

.55

.81

1.2

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05

<.05 .0

7

0.02 .0

6.0

2.0

1.0

3

.01

.02

.02

<.01 <oi

<.01

<.01 .0

2

<.01

<.01 <oi

<.01

<.01

<.01 .0

1.0

2

0.01 .1

5.1

6

.07

.27

.29

.09

.06

.03

.05

<.01

<.01 .0

3

.01

.02

.02

.03

.02

<.01 .0

2.0

4

<0.0

1

.14

.05

.06

.11

.08

.11

.10

<.01 <oi

<.01

<.01

<.01

<.01

<.01 <oi

<.01

<.01

<.01

<.01

<.01

2.7

10 25 20 23 25 22 21 5.7

7.4

8.4

9.6

9.8

10 7.5

10 7.7

5.2

5.5

7.9

7.3

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

TJ 2 o' SL TJ 5 "g a. $ § Q.

I fT SL 3D CO ff 3- z 5* of

| ro I (Q 8? o *

1

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (fi

g. 1

) R

eser

voir

nam

e ye

ar)

38

Pine

Riv

er R

eser

voir

03

/15/

93C

ontin

ued

07/1

3/93

09/2

1/93

39

Sand

y L

ake

Res

ervo

ir

05/1

4/92

07

/02/

9208

/20/

92

11/0

4/92

01/0

7/93

03/1

7/93

07

/15/

9309

/23/

93

40

Win

nibi

gosh

ish

Res

ervo

ir

05/1

4/92

07/0

1/92

08/1

9/92

11

/02/

9201

/06/

93

03/1

6/93

07/1

4/93

09/2

2/93

Col

lec

tio

n tim

e (2

4-

hour

)

1045

1300

1145

0930

08

4008

15

0900

0915

0845

08

1508

15

1200

1000

1115

10

1510

40

0835

1000

1045

Spec

ific

co

nduc

t

ance

(u

S/cm

)

Wat

er

tem

pera

tu

repH

(s

tand

ard

units

)M

inne

sota

C

ontin

ued

265

0 8.

022

522

2

112

110

120

120

130

178

117

117

310

280

273

278

310

335

290

275

20.0

14.5

14.0

16

.520

.0

4.0

0 0 19.5

13.0

15.0

17.5

20.5

4.

50 0 19

.012

.5

8.4

8.2

7.8

7.9

7.4

7.7

7.5

7.2

7.6

7.7

8.4

8.5

8.5

8.4

8.2

8.1

8.4

8.5

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

0.06

<.05

<.05 .0

9 <.

05<.

05

.05

.12

.26

<.05

<.05

<.05

<.05

<.05

<.

05<.

05

<.05

<.05

<.05

Orth

o-

Am

mo-

ph

osph

ate

Nitr

ite a

s ni

um a

s as

pho

s-

Silic

a as

ni

troge

n ni

troge

n ph

orus

Si

O2

(mg/

L)

(mg/

L)

(mg/

L)

(mg/

L)

<0.0

1 <0

.01

<.01

.0

2<.

01

.02

<.01

.0

5 <.

01

.04

.01

.09

.02

.12

<.01

.0

2 <.

01

.03

<.01

.0

2

<.01

.0

3<.

01

.03

<m

<ol

.02

.03

<.01

.0

1<.

01

.02

<.01

.0

1

<0.0

1 8.

4<.

01

6.4

<.01

7.

6

<.01

6.

9 <.

01

3.8

<.01

3.

8 <.

01

1.6

.02

3.4

.01

4.4

<.01

2.

4<.

01

2.6

<.01

1.

9<.

01

2.1

<.01

5.

6 <.

01

3.3

<.01

4.

3

<.01

4.

9<.

01

5.4

<.01

3.

2

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h

a

o-i

3

z§ 10 u

d -

2 |

Map

no.

<o a

(f

ig-1

) R

eser

voir

nam

e

Stf

(D

(p"S

o 41

H

amso

nvill

e L

ake

|a ""*'

2!<o

2.

"1 (D o" f 2 1 y 3

42

Har

ry S

Tru

man

z

Res

ervo

ir5* 3 5f 5'

O 1 d 5 3 E 8 43

L

ong

Bra

nch

Lak

e

2

S.' i 0) CD 3D (D i

Dat

e of

co

llect

ion

(mon

th/d

ay/

year

)

04/3

0/92

07/0

9/92

08/1

3/92

10/2

2/92

01/2

7/93

02/1

2/93

03/2

4/93

07/1

2/93

09/3

0/93

05/0

5/92

07/0

9/92

08/2

5/92

10/1

4/92

03/1

0/93

06/1

6/93

09/1

7/93

05/0

5/92

07/1

5/92

08/2

4/92

10/2

1/92

01/0

7/93

Col

lec

tio

n tim

e (2

4-

hour

)

1030

1000

1030

1030

1135

1100

1400

1230

1035

1040

1430

1100

1300

1630

0945

1130

1500

1700

1700

1415

1450

Spec

ific

W

ater

co

nduc

t-

tem

pera

- an

ce

t"re

(u

S/cm

) (°

C)

308

294 --

287

262 _

260

191

210

347

327

255

277

323 ._

232

212

220

211 -

174

Mis

sour

i

16.5

27.0

-- 16.0 2.0

_ 6.0

24.5

19.0

17.0

26.0

29.0

20.0 5.5

22.3

16.5

25.0

24.0

15.0 .5

pH

(sta

ndar

d un

its)

8.5

8.2

-- -- 7.8

_ 7.2

6.6

7.8

8.2

8.2

7.6^

7.8

7.8

__ 7.2

8.0

7.6

7.7

8.0

7.3

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

0.79

<.05

<.05

<.05 .9

8

.06

.25

.76

.25

.46

.49

<.05 .1

6.5

6

.42

.09

.27

.54

.06

.12

.31

Nitr

ite a

s ni

trog

en

(mg/

L)

0.02

<.01

<.01 .0

1.0

3

<.01 .0

3.0

9.0

3

.02

.01

<;oi

<.01

<.01 .0

1.0

5

.01

.02

<.01 .0

1.0

1

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

<0.0

1 .02

<.01 .0

4.1

6

.01

.16

.08

.16

.03

.02 :o2 .03

.04

.04

.15

.03

.07

.09

.03

.15

Ort

ho-

phos

phat

e as

pho

s

phor

us

(mg/

L)

<0.0

1<.

01<.

01<.

01 .10

<.01 .0

4.0

6.0

4

<.01

<.01 .0

1<.

01 .02

.06

.05

<.01

<.01 .0

1<.

01 .03

Silic

a as

Si

O2

(mg/

L)

-- 1.5

1.4

1.7

4.8

__ 5.5

4.8

3.9

2.0

2.8

4.2

2.3

-- 5.5

__

.1 1.9

1.6

<.l 3.9

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

o

ar CO I o

5 I CO Q> Q. SL o' 9L c_ ^ z 5'

1 o _L CO s I (Q i 3.

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (f

ig. 1

) R

eser

voir

nam

e ye

ar)

43

Lon

g B

ranc

h L

ak

e

03/2

2/93

Con

tinue

d 07

/01/

93

09/2

3/93

44

Mar

k T

wai

n L

ake

05/0

6/92

07

/15/

9208

/24/

92

10/2

2/92

01/0

7/93

03/2

2/93

06/2

3/93

09

/15/

93

45

Pom

me

de T

erre

Lak

e 05

/06/

9207

/08/

92

08/2

5/92

10/1

4/92

03/1

0/93

06/1

6/93

09/1

7/93

Col

lec

tio

n tim

e (2

4-

hour

)

1310

0830

0900

1300

13

0014

20

0750

0845

1115

1500

13

30

1240

1400

13

4515

0015

00

0800

1000

Spec

ific

co

nduc

t

ance

(u

S/cm

)

Wat

er

tem

pera

tu

rePH

(s

tand

ard

units

)M

isso

uri C

onti

nued

175

6.0

7.2

171

134

430

267

262

232

194

198

283

313

285

298

232

302

24.5

19.0

14.5

28

.025

.5

15.0 1.5

6.5

-~ 12.0

14.0

27

.020

.5 5.0

17.0

7.1

8.0

8.0

7.5

7.7

8.0

7.5

7.3

7.6

7.6

7.8

7.8

8.0

7.9

7.2

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

0.43 .5

5

.32

1.0

<.05 .2

3 .1

2.6

1

.88

1.0 .2

6

.55

.12

<.05

<.05 .5

9

.20

.20

Nitr

ite a

s ni

trog

en

(mg/

L)

<0.0

1.0

1

<.01 .0

1

.02

.01

.01

<.01 .0

2

<.01 .0

2

.01

<.01 .0

1.0

2

Ort

ho-

Am

mo-

ph

osph

ate

nium

as

as p

hos-

ni

trog

en

phor

us

(mg/

L)

(mg/

L)

0.13 .0

4.0

5

.03

.05

.09

.06

.02

.02

.04

.05

.05

.35

.02

.08

.02

.28

.55

0.02 .0

1.0

2

.03

.02

.05

.09

.07

.05

<.01 .0

2

<.01 .0

6

.08

.06

Silic

a as

S

i02

(mg/

L)

6.4

1.4

3.3

3.6

1.0

2.6

1.9

5.1

7.9

6.0

5.6 .7 2.0

1.1

1.8

~ 2.5

~

> o

o

o

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

mcentrations

of

Self

Til

1992

Through Se ts._|

^ 3

-(0

O I 1 1 y CD 0

. z f 1 5'

O | § 3 3 £ I Z Q. i

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (f

ig. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

ti

on ti

me

(24-

ho

ur)

wJj

GC

ITIC

cond

uct-

te

mpe

ra-

PH

ance

tu

re

(sta

ndar

d (U

S/cm

) (°

C)

unit

s)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Ort

ho-

Am

mo-

ph

osph

ate

Nitr

ite a

s ni

um a

s as

pho

s-

Silic

a as

ni

trog

en

nitr

ogen

ph

orus

Si

O2

(mg/

L)

(mg/

L)

(mg/

L)

(mg/

L)

Mis

sour

i C

ontin

ued

46

Smith

ville

Lak

e 05

/05/

9207

/07/

92

08/2

6/92

10/2

1/92

01/0

6/93

03/2

5/93

06/2

5/93

09/2

9/93

47

Stoc

kton

Lak

e 05

/06/

9207

/08/

9208

/25/

9210

7147

92

03/1

0/93

06/1

6/93

09/1

7/93

48

Bra

nche

d O

ak L

ake

05/0

7/92

07/0

1/92

09/1

1/92

10/2

7/92

01/0

6/93

0915

1400

0935

0930

1130

1245

1030

1000

1500

1615

1645

0800

1200

1400

0740

0915

0830

1200

0930

0930

268

274

252

256

205 _

244

242

268

237

251

268

277

273

269

444

391

409

413

400

14.0

26.0

23.0

14.0

- _ 18.0

17.0

15.5

28.0

27.0

19.5 8.0

26.0

22.0

Neb

rask

a

16.5

24.0

21.0

12.5 0

8.2

8.1

8.1

7.6

_ 6.4

7.5

8.1

8.2

7.7

8.1

7.8

8.0

7.7

8.5

8.5

8.6

8.3

8.5

0.38

<.05

<.05 .1

1.2

7

.45

.68

.38

.34

<.05

<.05

<.05 .4

0

.22

<.05

<.05

<.05

<.05

<.05

<.05

0.02

0.

07

<.01

.0

7<.

01

.04

.02

.04

.01

.04

.04

.05

<.01

.1

6<.

01

.10

<.01

.0

4<.

01

.02

<.01

<.

01

<.01

.0

6<.

01

<.01

<.01

.0

3<.

01

.05

<.01

.0

3<.

01

.04

<.01

.0

3<.

01

.02

.02

.02

0.01

1.

1<.

01

.6

.02

1.6

<.01

.5

<.01

.5

<.01

3.

0.0

2 2.

9.0

4 3.

8

<.01

.6

<.01

.4

.01

1.9

<.01

2.

7<.

01 .04

1.5

<.01

<.01

.3

.01

1.2

<.01

1.

3.0

2 1.

6<.

01

2.4

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 -

Con

tinue

d

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (fi

g. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

W

ater

co

nduc

t-

tem

pera

- an

ce

ture

G

iS/c

m)

(°C

)

pH

(sta

ndar

d un

its)

Nitr

ite

plus

ni

trate

as

nitro

gen

(mg/

L)

Orth

o-

Am

mo-

ph

osph

ate

Nitr

ite a

s ni

um a

s as

pho

s-

nitr

ogen

ni

troge

n ph

orus

(m

g/L)

(m

g/L)

(m

g/L)

Silic

a as

Si

02

(mg/

L)N

ebra

ska C

ontin

ued

I co 8 1 a 5" (o fit a o> I 8 to c I 1 5" i 2.

| 3-

«

48

Bra

nche

d O

ak L

ak

e

03/2

3/93

Con

tinue

d 07

/13/

9309

/14/

93

49

Cal

amus

Res

ervo

ir

05/0

8/92

07/0

9/92

08/2

7/92

10/2

2/92

12/1

6/92

03/2

4/93

08/0

4/93

09/1

7/93

50

Cun

ning

ham

Lak

e 05

/06/

9206

/30/

9208

/27/

9210

/26/

9201

/04/

93

03/2

4/93

07/1

2/93

09/1

3/93

0945

0945

0825

1530

0930

1230

0900

1303

0930

0935

1400

0930

0930

1130

0915

1130

1345

1700

1345

365

417

369

167

148

140

168

145

174

143

134

479

389

405

406

483

455

428

398

4.0

25.0

17.5

13.0

19.5

21.0

11.0 2.0

5.0

22.5

17.5

17.0

25.0

22.0

11.0 0 4.0

25.5

20.0

8.6

8.4

8.3

7.7

8.3

9.1

8.0

8.3

7.8

8.8

8.4

8.4

8.5

8.5

8.3

8.4

7.4

8.4

8.5

0.08 .0

6.6

3

.10

.07

.05

.14

.19

.55

<.05 .0

6

.87

.06

<.05

<.05 .2

2

.85

.73

.55

0.01

0.

13.0

2 .1

0.0

5 .0

8

<.01

.0

4<.

01

.17

<.01

.0

3<.

01

.01

<.01

.0

4

.01

.24

<.01

.0

3<.

01

<.01

.03

.05

.01

.05

<.01

.1

7<.

01

.02

.02

.03

.02

.15

.10

.23

.07

.11

0.03 .0

1.0

4

.06

.06

<.01 .0

2.0

3

.13

.02

.01

<.01

<.01

<.01 .0

1<.

01

<.01

<.01

<.01

4.7

1.0

1.3

29 11 27 13 16 43 6.6

<.l 2.2

<.l 2.2

2.7

41 5.4 .8 .2

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h^

.»

\JU

jJIX

il 1

Ik

TO

I 1

<7<

7vJ

WV

SI

IUI

IUC

U o

o

51 8 s*

g §

Map

no.

<§

2.

C'9-

1)

Res

ervo

ir n

ame

Dat

e of

co

llect

ion

(mon

th/d

ay/

year

)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

Wat

er

cond

uct-

te

mpe

ra-

ance

tu

rePH

(s

tand

ard

units

)

Nitr

ite

plus

ni

trate

as

nitro

gen

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Am

mo

ni

um a

s ni

trog

en

Orth

o-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L)0>

«?

Neb

rask

a C

ontin

ued

"S §

, 51

E

nder

s R

eser

voir

o &

3 a

il <o 2

."I 5 IT cT E o § 1 g

52

Har

lan

Cou

nty

Lake

to a. z =f o 1 3 O J|

1 § 8 53

H

arry

Str

unk

Lak

e1 2 0

. i _

05/0

7/92

07/0

7/92

08/2

5/92

10/2

0/92

12/1

5/92

03/2

3/93

08/0

3/93

09/2

1/93

05/0

5/92

07/0

8/92

08/2

6/92

10/2

1/92

12/1

4/92

03/2

2/93

07/2

2/93

09/2

0/93

05/0

6/92

07/0

8/92

08/2

6/92

10/2

1/92

12/1

4/92

1045

1130

1500

1030

1500

1730

0700

1130

1415

1400

1700

1300

1130

1630

1325

1100

0930

1030

1200

1000

1530

409

382

405

363

402

390

370

328

818

677

632

630 --

642 --

505

501

388

366

374

394

15.0

22.5

17.0

12.5 1.5

8.5

22.5

18.0

22.0

23.0

223

13.5 1.0

6.0

-- 20.0

15.5

22.0

18.0

12.5 1.5

7.9

8.2

7.7

7.7

8.3

8.6

8.3

7.9

8.2

8.2

8.7

8.3

8.0

8.2

~ 8.0

8.1

8.2

8.4

7.9

8.4

0.17

<.05 .4

6.0

7.2

6

.49

.14

<.05

<.05 .0

9.2

2.1

9.2

8

.40

<.05 .3

5

<.05 .2

9<.

05 .24

.27

<0.0

1<.

01<.

01<.

01 .02

.01

.02

<.01

<.01 .0

2<.

QJ _

.03

.02

.01

<.01 .0

1

<.01 .0

1<.

01<.

01<.

01

0.04 .0

5.0

3.0

7.0

2

.04

.05

.03

.04

.17

----

- .0

6^

.04

.07

.23

.03

.03

.06

.03

.04

.04

.03

<0.0

1

<.01

<.01

<.01

<.01

<.01

<.01

<.01 .0

5-.-

05 .03

.03

.13

.06

.17

.04

.01

.01

.02

<.01

55 24 35 29 30 36 35 31 25 2.4

26.3 1.6

5.8

2.2

8.0

37 21 11 28 29

s I

Tabl

e 8.

Phy

sica

l pro

perti

es a

nd a

naly

tical

res

ults

for

nutri

ents

col

lect

ed fr

om 7

6 re

serv

oirs

in th

e M

idw

este

rn U

nite

d S

tate

s, A

pril

1992

thro

ugh

Sep

tem

ber

1993

Con

tinue

d

Map

no.

(f

ig. 1

) R

eser

voir

nam

e

53

Har

ry S

trun

k L

ake

3

Con

tinue

dCD 8 3

54

Hug

h B

utle

r L

ake

<D a. 8 fit a I 8 3) 8 » 3" z

S.

55

Paw

nee

Lak

e

f 5f I i 3 «O ar £ s

Dat

e of

co

llect

ion

(mon

th/d

ay/

year

)

03/2

2/93

08/0

3/93

09/2

0/93

05/0

6/92

07

/07/

92

08/2

6/92

10/1

9/92

12/1

5/92

03/2

3/93

08

/03/

9309

/21/

93

05/0

7/92

07/0

1/92

08/2

7/92

10/2

7/92

01/0

6/93

03/2

3/93

07/1

3/93

09/1

4/93

Col

lec

tio

n tim

e (2

4-

hour

)

1200

1700

1400

1400

16

00

1000

1400

0900

1430

18

0015

30

1040

0935

1400

1045

1040

1115

1045

0920

Spec

ific

co

nduc

t

ance

((

iS/c

m)

Wat

er

tem

pera

tu

repH

(s

tand

ard

units

)N

ebra

ska C

ontin

ued

390

4.5

8.2

328

306

566

470

439

560

531

540

422

417

437

389

406

402

394

394

401

329

22.0

20.0

15.0

24

.0

19.5 9.5

4.0

6.0

23.5

19.0

16.5

24.5

23.0

13.5 0 4.0

25.0

17.0

8.4

7.6

8.2

7.9

8.5

8.1

7.5

7.8

8.3

7.3

8.5

8.4

8.6

8.4

8.4

8.1

8.2

8.1

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

0.69 .2

2.7

7

.35

<.05

.2

4.3

1.0

9

.17

.08

.14

<.05

<.05

<.05

<.05 .0

5

<.05 .1

3.6

1

Ort

ho-

Am

mo-

ph

osph

ate

Nitr

ite a

s ni

um a

s as

pho

s-

nitr

ogen

ni

trog

en

phor

us

(mg/

L)

(mg/

L)

(mg/

L)

0.01

0.

10.0

1 .0

5<.

01

.04

.02

.09

<.01

.0

4 .0

2 .0

7.0

1 .0

3<.

01

.07

<.01

.1

0 <.

01

.07

<.01

.0

5

<.01

.0

3<.

01

.04

<.01

.0

2<.

01

.02

.02

.04

<.01

.0

3.0

2 .3

9.0

2 .0

5

0.08 .1

1.1

2

.06

.03

.03

.02

.03

.05

.03

<.01 .0

1<.

01<.

01<.

01 .02

.02

.05

Silic

a as

Si

O2

(mg/

L)

32 14 <.l

53

11

29 52 32 36

18 24

.9 2.4 .8 1.4

2.9

3.7

6.1

4.5

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h

Concentrations

of

!

April 1992

Throu

gh </> §

; §

. o ?i jo

~* 7 So a » X <D O

1

g_ 2 S D) o- O I 0) a z 1 a 5" 0 5 1 3 1 S

a. i 2. » 3 0 o s

Ut^

plC

sI

1 I1

_»S

7I

t&\J

\J

WW

I Il

ll l

UV

^U

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (f

ig. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

ti

on ti

me

(24-

ho

ur)

Spec

ific

W

ater

co

nduc

t-

tem

pera

- pn

an

ce

ture

(s

tand

ard

friS

/cm

) (°

C)

units

)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

Ort

ho-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L)N

ebra

ska C

ontin

ued

56

Swan

son

Lak

e 05

/06/

9207

/07/

92

08/2

5/92

10/2

0/92

12/1

5/92

03/2

3/93

08/0

3/93

09/2

1/93

57

Will

ow C

reek

Res

ervo

ir

05/0

7/92

06/3

0/92

08/2

6/92

1072

6792

01/0

5/93

03/2

4/93

07/1

2/93

09/1

3/93

58

Pipe

stem

Res

ervo

ir

05/0

7/92

06/2

5/92

08/2

5/92

10/2

6/92

01/2

1/93

1630

1400

1800

0900

1230

1600

1000

0900

1315

1240

1120

1330

1130

1000

1300

1030

1500

1030

1130

1155

1020

771

630

722

595

659

508

639

572

247

252

244

502

459

249

347

399

700

710

740

725

865

23.5

23.0

24.0

11.0 1.0

7.0

23.5

19.5

17.5

23.0

20.0

f4TO 0 5.

023

.517

.0N

orth

Dak

ota

16.0

20.0

19.0 7.5 .5

8.5

8.5

8.5

8.1

8.9

8.8

8.4

8.0

8.5

8.4

8.4

7.8

7.9

7.1

8.2

8.3

8.0

8.5

8.3

8.7

7.6

0.29

<.05 .6

3<.

05 .11

.12

<.05 .0

6

.31

1.4

<.05

<.05 .2

6

.88

.14

.18

<.05

<.05 .0

7

<.05 .1

1

0.03

<.01 .0

4<.

01 .01

<.01

<.01

<.01 .0

2.0

8<.

01

<.01 .0

2

.11

.02

.01

<.01

<.01 .0

2<o

i.0

2

0.05 .1

2.0

9.0

5.0

1

.02

.02

.08

.14

.20

.16

.17

.13

.43

.07

.08

.05

.05

.30

.03

.91

<0.0

1<.

01<.

01<.

01<.

01

<.01

<.01

<.01

<.01 .0

2.0

1.1

4

.10

.18

.06

.09

.02

<.01 .0

4

.02

.33

27 17 18.3 3.2

6.4

4.3

4.2 .4 5.9

1.1

49 3.1

16 11 26

.3 .5 7.3

<.l 3.9

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (fi

g. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

ti

on ti

me

(24-

ho

ur)

Spe

cifi

c co

nduc

t

ance

(u

S/cm

)

Wat

er

tem

pera

tu

rePH

(s

tand

ard

units

)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

Orth

o-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L)

Nor

th D

akot

a C

ontin

ued

TJ 2. s. 3 g. w D) Q.

I "5. 1' 3) c 1 z 5' Jf D

3.

1 3 <Qp

58

Pipe

stem

Res

erv

oir

05

/04/

93

Con

tinue

d 07

/13/

93

59

Alu

m C

reek

Lak

e 05

/05/

9207

/20/

9209

/08/

9211

/04/

9201

/20/

93

03/2

5/93

07/0

1/93

09/2

7/93

60

Dee

r C

reek

Lak

e 05

/04/

9207

/30/

9209

/09/

9210

/14/

9201

/12/

93

03/2

6/93

07/1

2/93

09/2

9/93

0815

0830

1430

1100

1340

0915

1530

1130

0945

1230

1230

1000

1000

1200

1345

1010

0930

1100

496

550

493

501

445

464

453

368

402

419

553

498

492

477

515

533

470

498

9.0

17.5

Ohi

o

13.5

24.0

23.5

12.0 1.5

3.5

20.0

15.0

15.5

23.5

22.5

16.5 3.0

6.0

25.5

17.0

8.3

8.2

7.4

7.7

7.6

8.2

8.4

8.1

7.6

7.1

8.7

7.9

7.9

7.8

8.1

7.6

7.5

7.8

0.11 .3

6

2.2

1.9

1.4

1.1

1.3

1.6

1.5 .1

9

7.1

4.5

2.1

1.4

5.7

4.7

3.6

1.1

0.01 .0

5

.01

.04

.04

.02

.02

.03

.02

.02

.05

.16

.09

.07

.03

.03

.13

.01

0.19 .2

7

.02

.04

.08

.05

.03

.03

.03

.49

.01

.15

.06

.02

.09

.04

.27

.02

0.23 .1

0

<.01

<.01 .0

1<o

i<.

01

<.01

<.01

<.01

<.01 .0

1<.

01<.

01 .07

<.01 .0

1

.02

6.9

13 1.3

2.0

3.7

4.2

3.9

4.0

1.2

3.8

3.3

7.3

2.5 .9 7.3

6.0

7.3

2.6

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h^ _

vjc

pid

I lu

c/i

i &

iy\j

\_

/ui

mi

iuc«u

TJ

0 0

S3

~

ro 5

1* |

Map

no.

ID

2.

(f'9

-1)

R

eser

voir

nam

e»V fy 2.

61

Del

awar

e La

keA

i 5. 3

-go

<*> 5

1 s i E

o § i | jf

62

Dill

on L

ake

0)

S 2 1 3_ 5"

O 3 1 3 8 63

H

oove

r R

eser

voir

2

5 i *m

Dat

e of

co

llect

ion

(mon

th/d

ay/

year

)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

co

nduc

t

ance

(n

S/cm

)

Wat

er

tem

pera

tu

rePH

(s

tand

ard

units

)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Ort

ho-

Am

mo-

ph

osph

ate

nium

as

as p

hos-

ni

trog

en

phor

us

(mg/

L)

(mg/

L)

Silic

a as

Si

O2

(mg/

L)O

hio C

ontin

ued

05/0

5/92

06/3

0/92

08/1

2/92

10/0

7/92

12/3

0/92

03/2

4/93

07/0

6/93

09/2

7/93

04/3

0/92

07/0

7/92

09/1

0/92

10/1

4/92

01/1

2/93

03/2

4/93

07/0

9/93

09/2

8/93

05/0

6/92

07/2

0/92

09/0

8/92

11/0

4/92

01/2

0/93

1230

1230

1200

1300

0920

1500

1130

1030

1115

1330

OQ

flft

\jy\

j\j

0900

0930

1000

1200

1400

1000

0900

1130

1100

1130

502

521

423

517

570

440

295

454

510

599

432

570

439

412

390

593

484

500

432

410

405

14.0

21.5

21.5

17.5 1.5

5.5

22.5

18.0

14.0

23.5

2L5

15.0 4.0

7.5

27.0

18.5

12.0

19.5

21.5

12.0 1.0

7.5

7.3

7.9

7.9

8.1

8.7

7.4

8.0

7.2

7.6

OJl

8.6

8.2

8.6

7.9

7.8

8.8

7.9

7.4

8.1

8.7

7.1

3.3

1.7 .2

33.

0

3.3

5.9 .6

3

.73

.54

85

t*f

c*

.62

2.6

2.0

4.4 .4

3

3.2

2.2

1.3 .9

81.

4

0.07 .2

5.0

7.0

3.0

4

.04

.17

.03

<.01 .0

9.0

6.0

3.0

4

.04

.10

.05

.02

.05

.08

.01

.03

0.13 .5

0.1

3.0

6.1

2

.14

.28

.07

.02

.27 21

-

~»»~

±

.07

.10

.07

.19

.34

.02

.08

.16

.03

.03

0.04 .0

1.0

1<.

01 .03

<.01 .0

6.0

2

<.01

<.01 05

- V

i^

.02

.04

<.01

<.01 .0

3

<.01 .0

1<.

01<.

01 .01

8.1

~ 9.7 .5 7.1

5.7

5.5

2.5

2.8

2.7

64

\y»

^r

4.4

7.5

6.0

4.4

6.7

<.l

1.6

4.5

3.5

3.7

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 C

ontin

ued

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (fi

g. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

W

ater

co

nduc

t-

tem

pera

- an

ce

ture

(u

S/cm

) (°

C)

pH

(sta

ndar

d un

its)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Ort

ho-

Am

mo-

ph

osph

ate

nium

as

as p

hos-

ni

trog

en

phor

us

(mg/

L)

(mg/

L)

Silic

a as

Si

O2

(mg/

L)O

hio

Con

tinue

d ,

ar CD fit 3 * <D CD

fit Q. i o" St DO <D

CD c CD 1 § 9 1 i =? 3 (Q 1

63

Hoo

ver R

eser

voir

03/2

5/93

Con

tinue

d 07

/01/

9309

/24/

93

64

Milt

on R

eser

voir

05

/11/

9207

/07/

9208

/17/

9210

/21/

9201

/13/

93

04/2

0/93

07/2

0/93

09/2

1/93

65

O'S

haug

hnes

sy R

eser

voir

05

/05/

9206

/30/

9208

/12/

9210

/07/

9212

/30/

92

03/2

2/93

06/2

9/93

09/2

8/93

1000

1130

1030

1100

0900

1120

1100

1145

1045

1100

0800

0845

1000

0930

1100

1155

1015

1500

1000

314

344

333

604

621

510

443

404

399

388

407

724

606

547

771

720

581

558

713

3.0

17.0

20.0

14.5

19.5

22.0

11.5 2.0

11.5

22.5

19.0

11.5

20.5

20.5

14.0 3.0

3.0

23.5

14.0

8.2

7.8

7.7

6.9

6.8

8.4

8.2

8.3

8.0

7.0

7.4

7.7

7.4

8.7

8.2

7.4

8.6

8.1

7.4

2.0

1.3 .7

8

.75

.71

1.1 .5

61.

0

1.2 .17

.08

9.8

11 2.2 .8

74.

0

4.3

5.2 .7

3

0.03 .0

2.0

4

.01

.09

.08

.05

.02

.02

.03

.02

.06

.09

<.01 .0

1.0

6

.04

.09

<.01

0.05 .0

4.1

1

.10

.37

.08

.09

.03

.04

.66

.13

.03

.05

.03

.02

.10

.10

.12

.04

0.01

<.01 .0

2

<.01

<.01

<.01

<.01

<.01

< 01

<.01 .0

1

.04

.02

.08

.02

.08

.04

.01

.05

4.9

2.5

3.3 .5 1.8

2.9

2.8

3.4

2.1

4.0

2.1

7.4

5.4

7.6 .9 7.4

6.5

4.4

4.3

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

fro

m 7

6 re

serv

oirs

in th

e M

idw

este

rn U

nite

d S

tate

s, A

pril

1992

thro

ugh

Concentrations

of

Se

April 1992

Throu

gh S $8

II

II

<o S

.b>

Q

.

« z 2

o Q.

<D S 1 5T JO o> Q. i ? 1 5" O c o 3 3 8 Q. S Q. i | 9 i

VJC

|^L

WI

1 IL

St^

l 1

\J\J

\J

VS

V/I

Ill

l IU

OV

J

Dat

e of

C

olle

c-

Spe

cifi

c W

ater

co

llec

tion

ti

onti

me

cond

uct-

te

mpe

ra-

pn

Map

no.

(m

onth

/day

/ (2

4-

ance

tu

re

(sta

ndar

d (f

ig. 1

) R

eser

voir

nam

e ye

ar)

hour

) (p

.S/c

m)

(°C

) un

its)

66

Sand

Lak

e 05

/06/

9206

/24/

92

08/3

1/92

10/1

4/92

01/2

2/93

03/2

4/93

07/0

1/93

09/0

8/93

67

Chi

ppew

a Fl

owag

e 05

/06/

9207

/15/

9208

/18/

9210

/20/

92

01/0

6/93

04/2

0/93

07/1

3/93

09/0

7/93

68

Dai

ryla

nd R

eser

voir

05

/06/

9207

/14/

92

08/1

9/92

10/2

0/92

01/0

6/93

1245

1030

1030

0930

1500

1015

0800

0830

1350

1210

1415

1430

1320

1615

1320

1430

0900

1245

0915

1700

1550

1,33

0

1,32

0

1,38

01,

440

2,00

0

1,92

0

830

680 70 114

I34 11

413

1 99 88 129 95 97 106 87 113

Sout

h D

akot

a

15.5

22.0

16.0 5.0 .5 2.0

19.5

16.5

Wis

cons

in

12.5

21.5

2L5

9.0

1.0

5.5

21.5

20.5

11.0

20.0

20.5 8.5

1.0

8.3

8.4

8.6

8.5

7.6

8.3

8.2

8.1

7.6

7.7

8,0

7.7

7.2

7.9

7.3

7.9

7.0

7.1

7.2

7.9

7.3

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

<0.0

5<.

05

<.05 .1

0<.

05

<.05

<.05

<.05 .1

4

.29

.49

.41

.89

.55

.38

.64

.09

.09

<.05 .1

0

.20

Nitr

ite a

s ni

trog

en

(mg/

L)

<0.0

1<.

01

<.01 .0

2.0

2

<.01 .0

1<.

01

<.01 .0

1JQ

Z ._

_-.

.02

.02

.01

.01

.02

<.01

<.01

<.01

<.01 .0

3

Ort

ho-

Am

mo-

ph

osph

ate

nium

as

as p

hos-

ni

trog

en

phor

us

(mg/

L)

(mg/

L)

0.02 .0

2.0

3.2

8.4

3

.14

.11

.04

.04

.36

,60

.11

.45

.29

.24

.38

.04

.05

.03

.09

.07

0.09 .1

3.1

4.0

9.1

9

.17

.12

.32

<.01 .0

4

.0$

.04

.09

.07

.04

.07

<.01 .0

1<.

01 .01

.01

Silic

a as

S

i02

(mg/

L)

19 21 35 31 40 18 17 33 5.9

6.7

6.9

9.6

12 8.7

7.6

9.2

6.5

5.9

5.7

9.5

11

Tabl

e 8.

P

hysi

cal p

rope

rtie

s an

d an

alyt

ical

res

ults

for

nutr

ient

s co

llect

ed f

rom

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 1

99

3 C

on

tinu

ed

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (f

ig. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

W

ater

co

nduc

t-

tem

pera

- an

ce

ture

PH

(sta

ndar

d un

its)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

Ort

ho-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L)W

isco

nsin

C

ontin

ued

3 i Tl

1 3 <D to a. 8L I 30 » C Sf o" z c 1 S | (O s 3 c (O (O

<D S 3 a* <D

68

Dai

ry la

nd R

eser

voir

04

/21/

93C

ontin

ued

07/1

3/93

09/0

8/93

69

Lake

Men

dota

05

/08/

9207

/21/

9208

/21/

9210

/23/

9201

/05/

93

04/1

9/93

07/1

2/93

09/0

1/93

70

Lake

Men

omin

05

/06/

9207

/15/

9208

/18/

9210

/20/

9201

/06/

93

04/2

0/93

07/1

3/93

09/0

7/93

0800

1700

0655

1130

1130

0920

1050

1130

1200

1130

1145

0900

0815

1050

1040

0950

1215

1110

1220

73 78 118

450

408

416

423

443

455

421

408

171

218

232

215

244

165

188

229

4.0

21.5

20.0

12.5

23.5

22.5

13.5 1.0

5.5

24.0

24.0

14.0

22.5

21.5 7.5

1.0

7.0

21.5

20.0

6.7

8.2

7.0

8.6

8.5

8.5

8.6

8.3

8.3

8.8

8.9

7.4

7.2

7.8

8.8

7.2

7.4

7.3

7.8

0.13 .0

8<.

05 .31

<.05

<.05

<.05 .1

6

.45

.12

<.05 .7

5.7

2.4

5.4

22.

0

1.0 .7

3.5

4

<0.0

1<.

01<.

01 .02

<.01

<.01

<.01 .0

2

.02

.03

<.01 .0

1.0

3.0

2.0

1.0

3

.01

.01

.01

0.05 .0

7.0

6

.06

.05

.03

.17

.46

.38

.03

.02

.02

.15

.04

.02

.07

.03

.06

.03

<0.0

1 .01

.01

.05

<.01

<.01 .0

7.0

9

.11

.03

.02

.01

.06

.02

<.01 .0

4

.04

.05

.04

8.3

6.2

6.4 .3 .4 1.0

<.l .8 1.5

1.3

2.7

9.2

12 12 9.6

16 11 10 13

10 CO

Tabl

e 8.

Phy

sica

l pro

perti

es a

nd a

naly

tical

res

ults

for

nutri

ents

col

lect

ed fr

om 7

6 re

serv

oirs

in th

e M

idw

este

rn U

nite

d S

tate

s, A

pril

1992

thro

ugh

Concentrations

of

SeU

April 1992

Throu

gh Se IP a If Ii * x i 8- I I 0 z 1 1 y o i i 1 1 z i 1

\_>

t7^>

ld 1

IU

d

1 v

7v

7v

j W

l/l

UN

IU

C7

VJ

Dat

e of

co

llect

ion

Map

no.

(m

onth

/day

/ (fi

g. 1

) R

eser

voir

nam

e ye

ar)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

cond

uct

ance

(li

S/cm

)

Wat

er

tem

pera

tu

rePH

(s

tand

ard

units

)

Nitr

ite

plus

ni

trat

e as

ni

trog

en

(mg/

L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

Orth

o-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L)W

isco

nsin

C

ontin

ued

71

Lake

Mon

ona

05/0

8/92

07/2

1/92

08/2

1/92

10/2

3/92

01/0

5/93

04/1

9/93

07/1

2/93

09/0

1/93

72

Lake

Wau

besa

05

/08/

9207

/21/

9208

/21/

9210

/23/

9201

/05/

93

04/1

9/93

07/1

2/93

09/0

1/93

73

Lake

Wau

sau

05/0

7/92

07/1

6/92

08/2

0/92

10/2

1/92

01/0

7/93

0950

1015

0815

0945

1030

1115

1015

1025

1050

1100

0850

1015

1100

1140

1030

1050

0930

1130

0850

1300

1330

479

455

453

460

477

493

448

419

503

465

482

475

501

476

453

440

105

142

174

125

133

14.0

23.5

22.0

12.5 1.0

7.0

23.0

24.0

15.0

23.5

22.0

11.5 2.0

5.5

24.5

24.5

12.5

22.0

21.5 5.5 .5

8.6

8.5

8.9

7.6

8.0

7.5

8.1

7.9

8.7

8.4

8.6

8:4

8.3

8.5

8.6

8.6

7.0

7.6

7.6

8.0

7.2

0.05

<.05

<.05

<.05 .1

5

.32

<05

<.05 .1

9<.

05

<.05 .0

8.4

6

.47

<.05

<.05 .2

3.2

5<.

05 .35

.54

0.01 .01 .01 .0

2

.02

<.01

<.01 .0

2.0

1<.

01 <.ol .03

.02

<.01

<.01 .0

1<.

01<.

01<.

01 .03

0.04 .0

5

.02

.24

.46

.08

.05

.03

.07

.04

.02

.22

.26

.15

.03

.06

.06

.03

.02

.08

.11

<0.0

1<.

01<.

01 .04

.07

<.01 .0

2<.

01

<.01

<.01

<.01 .0

1 .03

<.01 .0

3<.

01

<.01 .0

2<.

01 .02

.03

0.3

1.2

1.2 .4 .5 .7 1.9

2.9 .2 3.0

3.2

2.8 .3 2.5

5.6

6.1

6.5

5.1

1.7

10 13

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93 -

Con

tinue

d

Map

no.

(fi

g. 1

) R

eser

voir

nam

e

Dat

e of

co

llect

ion

(mon

th/d

ay/

year

)

Col

lec

tio

n tim

e (2

4-

hour

)

Spec

ific

co

nduc

t

ance

(n

S/cm

)

Wat

er

tem

pera

tu

rePH

(s

tand

ard

unit

s)

Nitr

ite

plus

ni

trate

as

nitr

ogen

(m

g/L)

Nitr

ite a

s ni

trog

en

(mg/

L)

Am

mo

ni

um a

s ni

trog

en

(mg/

L)

Orth

o-

phos

phat

e as

pho

s

phor

us

(mg/

L)

Silic

a as

Si

O2

(mg/

L)W

isco

nsin

C

ontin

ued

o CD I o 5 S D> o. D> I O SL 3) o CD c CD ^ z I" s? | i | (O CO o a

73

Lak

e W

ausa

u C

ontin

ued

74

Lak

e W

isso

ta (

5548

)

75

Lak

e 77

46

04/2

1/93

07/1

4/93

09/0

8/93

05/0

5/92

07/1

4/92

08/1

9/92

10/2

1/92

01/0

7/93

04/2

1/93

07/1

4/93

09/0

7/93

05/0

7/92

07/1

6/92

08/2

0/92

10/2

2/92

01/0

8/93

04/2

0/93

07/1

3/93

09/0

7/93

1340

1215

1045

1550

1430

1050

0915

0850

1010

0850

1720

1415

1400

1120

1230

1230

0845

0745

0915

81 112

136 49 66 78 72 82 53 61 86 154

169

189

200

248

133

112

178

5.0

22.0

18.0

12.5

21.5

21.5 6.5

1.0

5.0

21.5

19.5

14.5

23.5

22.5 9.0 .5

4.0

23.5

20.0

8.4

8.0

7.7

6.5

7.2

7.3

8.0

7.4

7.2

7.7

7.4

7.6

7.9

7.7

7.7

7.5

8.2

8.0

7.6

0.40 .2

7.0

7

.07

<.05

<.05

<.05 .1

5

.07

.08

<.05 .4

3

.05

.13

.46

.94

.60

.45

.25

0.01

<.01

<.01

<.01

<.01

<.01

<.01 .0

3

< .0

1

< .0

1<.

01 .01

<.01 .0

1

.02

.02

.01

.02

.01

0.06 .0

6

.03

.06

.06

<.01 .0

7.0

7

.06

.05

.03

.05

.03

.17

.11

.15

.11

.08

.03

0.02 .0

2.0

1

<.01

<.01

<.01

<.01 .0

1

<.01

<.01

<.01

<.01 <oi

<.01 .0

2.0

4

.03

.05

<.01

6.7

7.4

4.8

6.7

6.2

5.8

4.9

11 8.2

6.9

6.1

3.0

3.9

4.3

2.6

9.4

7.5

4.7

1.1

10 at

Tabl

e 8.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

76

rese

rvoi

rs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il 19

92 th

roug

h S

epte

mbe

r 19

93-<

)ont

inue

d

= 5 _l Q)

(P 3

35

Sf

hi 5

H fl 18 *l 3 &

if 8" U

Q. * <D cT §- 1 f"~ . 0> 3 Q.

1 0 g 3 0

Dat

e of

colle

ctio

nM

ap n

o.

(mon

th/d

ay/

(fig.

1)

Res

ervo

ir n

ame

year

)

Col

lec

tion

time

(24-

hour

)

Spec

ific

cond

uct

ance

(liS/

cm)

Wat

erte

mpe

ra-

pntu

re(°

C)(s

tand

ard

units

)

Nitr

itepl

usni

trate

as

nitro

gen

(mg/

L)

Nitr

ite a

sni

trog

en(m

g/L)

Am

mo

nium

as

nitr

ogen

(mg/

L)

Orth

o-ph

osph

ate

as p

hos

phor

us(m

g/L)

Silic

a as

Si0

2(m

g/L)

Wis

cons

in C

ontin

ued

76

Spri

ng V

alle

y L

ake

05/0

6/92

07/1

5/92

08/1

8/92

10/2

0/92

01/0

6/93

04/2

0/93

07/1

3/93

09/0

7/93

--- -

- -

1050

1010

1220

1220

1115

1415

1215

1320

- -

-----

275

241

281

342

400

234

281

318

14.0

21.5

21.5 7.5

1.0

6.0

20.5

19.5

8.5

8.4

8.7

8.5

7.7

7.9

8.1

8.2

0.64 .7

4.0

6.6

31.

8 .72

.49

.25

0.02 .0

3.0

2.0

2.0

3

.01

.03

.02

0.02 .0

4<.

01 .07

.10

.05

.05

.06

<0.0

1 .07

<.01

<.01 .0

1

.03

.01

<.01

4.6

4.1

4.8

6.3

11 7.1

2.6

8.0

I s I

Tabl

e 9.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

top

and

bot

tom

of

17 r

eser

voirs

in t

he M

idw

este

rn U

nite

d S

tate

s, A

pril

1992

thro

ugh

Sep

tem

ber

1993

[jiS

/cm

, mic

rosi

emen

s pe

r cen

timet

er a

t 25

degr

ees

Cel

sius

; °C

, deg

ree

Cel

sius

; m

g/L,

mill

igra

ms

per l

iter;

<, le

ss th

an; , n

o da

ta]

z i (D 1

CO 1 | Tl 1 0> 3 Q.

03 o 3 a 30 (D $ O.

"^ o to

to 10 ! (0 »* I (D to 8

Map

no

. (f

ig. 1

) R

eser

voir

nam

e

1 C

arly

le L

ake

4 L

ake

Dec

atur

5 L

ake

Shel

byvi

lle

6 L

ake

Ver

mill

ion

8 R

end

Lak

e

1 5

Mis

siss

inew

a L

ake

19

Sala

mon

ie L

ake

23

Rat

hbun

Lak

e

30

Pom

ona

Lak

e

Dat

e of

co

llect

ion

(mon

th/

day/

year

)

08/2

5/92

08/2

5/92

09/0

1/92

09/0

1/92

08/2

5/92

08/2

5/92

08/2

8/92

08/2

8/92

08/2

4/92

08/2

4/92

08/1

7/92

08/1

7/92

08/1

8/92

08/1

8/92

08/1

2/92

08/1

2/92

08/2

7/92

OS/

27/9

2

Sam

pl

e ty

pe top

botto

m

top

botto

m

top

botto

m

top

botto

m

top

botto

m

top

botto

m

top

botto

m

top

botto

m

top

botto

m

Dep

th

of

sam

ple

(fee

t)

0.5

7 1 15

.520 2 19

.510

.570

.560

.544

136

Spec

ific

Wat

er

cond

uct-

te

mpe

r

ance

at

ure

484

500

527

528

478

547

523

568

403

408

319

359

416

370

253

262

327

328

Illin

ois

25.5

24.0

23.0

22.5

25.0

17.5

24.0

23.0

25.5

23.5

Indi

ana

24.0

21.5

21.0

24.0

Iow

a

25.0

22.0

Kan

sas

23.5

23.5

PH

(sta

nd

ard

units

)

8.1

7.4

8.0

7.9

7.5

6.9

7.9

7.2

8.3

7.3

8.4

7.0

7.4

9.1

8.8

7.4

6.3

7.8

Am

m

oniu

m

(mg/

L)

0.06 .2

4

.11

.11

.02

1.4 .0

4.0

6

.02

.19

.03

.10

.26

.03

.07

.02

.01

.02

Nitr

ite

plus

D

is-

nitr

ate

solv

ed

as

oxyg

en

nitr

ogen

(m

g/L)

(m

g/L)

8.0

2.2

6.5

5.8

4.3 .2

0

6.0 .5

0

10.5 2.4

9.2 .4

0

.40

12.5 8.8 .1

0

-

0.05 .0

5

3.7

3.7

2.9 .7

8

5.0

4.6 .0

5.0

5

1.5

1.5

3.2

3.9 .3

6.2

4

.25

.25

Nitr

ite

(mg/

L)

0.01 .0

2

.06

.06

.22

.04

.10

.13

.01

.02

.04

.05

.11

.10

.02

.02

<.01

<.01

Orth

o-

phos

ph

ate

(mg/

L)

0.16 .2

0

.07

.07

.01

.02

.01

.01

.02

.05

.03

.05

.03

.02

<.01

<.01

<.01

<.01

Silic

a (m

g/L)

1.6

3.3

10 10 1.3

3.3

8.4

8.6

2.7

3.7

2.4

3.9

3.9

1.7

1.8 .4 2.5

2.7

Tabl

e 9.

P

hysi

cal p

rope

rties

and

ana

lytic

al r

esul

ts fo

r nu

trien

ts c

olle

cted

from

top

and

botto

m o

f 17

res

ervo

irs in

the

Mid

wes

tern

Uni

ted

Sta

tes,

Apr

il

s VI 1 1 3 1 3 0 o 3>

O

O

O 51 <O 3

<O fl

110

3 1

f §

0

«to

o

w£

o <?

{? s

»§

&If ii "f <D 3* o a <D 1 to cr

o I D> a 4<D 1 3 O 1 3 3 5* S & 2 1 « ff 3 <D O

2

1 v/v

/£-

11 1

Map

no.

(tig.

1)

34 36 40 48 57 59 62 69

WU

VJI

1 V

_H

^JJ

IV^I

1 IM

&I

1 v»

%<

Res

ervo

ir n

ame

Cro

ss L

ake

Lac

Qui

Par

leR

eser

voir

Win

nibi

gosh

ish

Res

ervo

ir

Bra

nche

d O

ak L

ake

Will

ow C

reek

Res

ervo

ir

Alu

m C

reek

Lak

e

Dill

on L

ake

Lak

e M

endo

ta

"J

WV

H I

UI

IUC

Dat

e of

colle

ctio

n(m

onth

/da

y/ye

ar)

08/1

9/92

08/1

9/92

08/2

0/92

08/2

0/92

08/1

7/92

08/1

7/92

09/1

1/92

09/1

1/92

08/2

6/92

08/2

6/92

08/0

6/92

08/0

6/92

09/1

5/92

09/1

5/92

07/2

3/92

07/2

3/92

i\J

Sam

pl

ety

pe

top

botto

m

top

botto

m

top

botto

m

top

botto

m

tori

botto

m

top

botto

m

top

botto

m

top

botto

m

Dep

thof

sam

ple

(feet

)

1.5

25

1.5

11 3 55

125 1 19 3.

336 3.

330 1.

551

Spec

ific

cond

uct

ance

(uS/

cm)

247

308

864

868

281

282

407

409

244

243

454

458

468

570

425

477

Wat

erte

mpe

rat

ure

(°C)

Min

neso

ta

21.0

18.0

21.5

21.5

20.0

20.0

Neb

rask

a

21.0

21.0

20.0

19.0

Ohi

o

24.0

20.0

22.5

21.5

Wis

cons

in

20.5

10.0

PH(s

tand

ar

dun

its)

8.2

7.4

8.1

8.1

8.2

8.2

8.5

8.4

8.4

8.4

8.4

8.1

8.1

7.8

8.6

7.6

Am

m

oniu

m(m

g/L)

0.04 .7

3

.43

.41

<.01 .0

2

.04

.06

,18

.18

.02

.06

.26

.60

.08

.83

Dis

so

lved

oxyg

en(m

g/L) -- ~ ~ ~ ~ ~ 7.2

6.8

&5

6.1

8.4 .4

0

5.4

1.4

7.6 .2

0

Nitr

ite

plus

nitr

ate

Orth

o-as

ph

os-

nitr

ogen

N

itrite

ph

ate

(mg/

L)

(mg/

L)

(mg/

L)

<0.0

5 <0

.01

<0.0

1<.

05

<.01

<.

01

.08

.01

.12

.08

.01

.12

<.05

<.

01

<.01

<.05

<.

01

<.01

<.05

<.

01

<.01

<.05

<.

01

<.01

<J)5

<Q

1 <.

01<.

05

<.01

.0

1

2.0

.05

<.01

1.9

.05

<.01

.53

.03

.02

.40

.03

.04

<.05

<.

01

<.01

.14

.04

.29

Silic

a(m

g/L)

7.1

9.2

29 29 7.3

7.9

1.2

1.2

13 1.1

3.4

4.3

5.3

5.6

1.1

2.5

concentrations of selected herbicides, herbicide metabolites, and

Documents