la grange isgs #52 wetland mitigation bankla grange wetland mitigation bank general study area and...
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LA GRANGE ISGS #52WETLAND MITIGATION BANK Sequence #9579Brown County, near La Grange, IllinoisPrimary Project Manager: Keith W. CarrSecondary Project Manager: Geoffrey E. Pociask
SITE HISTORY
C February 2000: ISGS was tasked by IDOT to conduct a Level II hydrogeologicassessment of the site.
C January 2003: ISGS submitted a wetland banking instrument to IDOT.
C January 2005: A Level II hydrogeologic characterization report was submitted to IDOT(ISGS Open-File Series 2005–02).
C Fall 2005 and 2006: Extensive earthworks were undertaken by IDOT, including fillingand plugging of several ditches, reshaping of the east levee, constructing a raisedaccess road, and excavating a large basin in the north-central area of the site.
C Summer 2011: Further earthworks were undertaken at the site. The former basin ofAmelia Barker Lake was widened and the fill utilized for road construction. Similar to2010, large magnitude and long-duration floods affected the site. The site remainedflooded over most of its area from late April to early July.
WETLAND HYDROLOGY CALCULATION FOR 2011
We estimate that the total area of the site that satisfied wetland hydrology criteria for greaterthan 5% of the growing season in 2011 was 578 ha (1,428 ac) out of a total site area of 666 ha(1,645 ac); 564 ha (1,393 ac) also satisfied wetland hydrology criteria for greater than 12.5% ofthe growing season, according to the 1987 Manual. Using the 2010 Midwest RegionSupplement (U.S. Army Corps of Engineers 2010) to the 1987 Manual, we estimate that 575 ha(1,420 ac) satisfied wetland hydrology criteria for 14 or more consecutive days during thegrowing season. These estimates are based on the following factors:
C The median date that the growing season begins in nearby Rushville, Illinois, is April 6,and the season lasts 208 days (MRCC 2011); 5% of the growing season is 10 days,and 12.5% of the growing season is 26 days, according to the 1987 Manual. Accordingto methods outlined in the 2010 Midwest Region Supplement, we estimate that March 3was the starting date of the 2011 growing season, based on measurements from an on-site soil-temperature data logger.
C Total precipitation for the monitoring period at the Rushville, IL, weather station was101% of normal. During the March to May period, precipitation was 92% of normal. Asin previous years, large precipitation events upstream in the watershed led towidespread and sustained flooding of the site during this period. Precipitation in June,however, was 243% of normal, which contributed to sustained flooding into July.
C In 2011, wells 41S and 42S satisfied wetland hydrology criteria for greater than 5% ofthe growing season and also for greater than than 12.5% of the growing season,
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according to the 1987 Manual. According to the 2010 Midwest Region Supplement,wells 41S and 42S also satisfied wetland hydrology criteria for 14 or more consecutivedays during the growing season. Wells 2S and 14S did not satisfy wetland hydrologycriteria.
• Two long-duration flood events occurred during the growing season in 2011. Accordingto the U.S. Army Corps of Engineers gauge at the nearby La Grange lock and dam andone on-site data logger in a monitoring well (Well 41S), the site was inundated for aperiod sufficient to satisfy wetland hydrology criteria at an elevation of at least 134.10 m(439.96 ft) for greater than 5% of the growing season and at an elevation of at least133.50 m (437.99 ft) for greater than 12.5% of the growing season, according to the1987 Manual. According to the 2010 Midwest Region Supplement, surface-water levelsat the USACE gauge and the Well 41S data logger also satisfied wetland hydrologycriteria at an elevation of at least 133.90 m (439.30 ft) for 14 or more consecutive daysduring the growing season.
PLANNED FUTURE ACTIVITIES
C Additional flood-resistant data loggers will be added to the site in the Fall of 2011.
C Monitoring of hydrology will continue until no longer required by IDOT.
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La Grange Wetland Mitigation BankGeneral Study Area and Vicinity
from the USGS Topographic Series, Cooperstown, IL, 7.5-minute Quadrangle (USGS 1980)
contour interval is 10 feet
Illin
ois
Riv
er
La Moine River
j
site boundary
0
0
1 km
1 mi
Big Lake
HorseshoeLake
65
!(
!(!(!(
!(!(!(
!(41S
42S
2S/M/L
14S/M/L
La Grange Wetland Mitigation BankEstimated Areal Extent of 2011 Wetland Hydrology
Map based upon Illinois National Agriculture Imagery Program (NAIP) digital orthophotograph, Cooperstown NE quarter quadrangle, taken August 8, 2010 (USDA-FSA 2010)
³
September 1, 2010 through August 31, 2011
0 500 m
0 2000 ft
2011 Wetland Hydrology>5% of growing season (1987 Manual)>12.5% of growing season (1987 Manual)14 days or more (2010 Midwest Region Supplement)site boundary
!( monitoring well(s)kj rain gauge
66
La G
rang
e W
etla
nd M
itiga
tion
Ban
kSe
ptem
ber 1
, 201
0 th
roug
h O
ctob
er 1
, 201
1
131.
50
132.
00
132.
50
133.
00
133.
50
134.
00
134.
50
Sep 2010
Oct 2010
Nov 2010
Dec 2010
Jan 2011
Feb 2011
Mar 2011
Apr 2011
May 2011
Jun 2011
Jul 2011
Aug 2011
Sep 2011
Oct 2011
Elevation (in m referenced to NAVD, 1988)
Wat
er-L
evel
Ele
vatio
ns in
Sha
llow
Mon
itorin
g W
ells
Wel
l 2S
Wel
l 14S
Wel
l 41S
Wel
l 42S
Wel
l 41S
(logg
er)
67
La G
rang
e W
etla
nd M
itiga
tion
Ban
kSe
ptem
ber 1
, 201
0 th
roug
h O
ctob
er 1
, 201
1
-2.0
-1.5
-1.0
-0.5 0.0
0.5
1.0
Sep 2010
Oct 2010
Nov 2010
Dec 2010
Jan 2011
Feb 2011
Mar 2011
Apr 2011
May 2011
Jun 2011
Jul 2011
Aug 2011
Sep 2011
Oct 2011
Depth (in m referenced to land surface)
Dep
th to
Wat
er in
Sha
llow
Mon
itorin
g W
ells
Wel
l 2S
Wel
l 14S
Wel
l 41S
Wel
l 42S
Wel
l 41S
(logg
er)
68
La G
rang
e W
etla
nd M
itiga
tion
Ban
kSe
ptem
ber 1
, 201
0 th
roug
h O
ctob
er 1
, 201
1
127.
5
128.
0
128.
5
129.
0
129.
5
130.
0
130.
5
131.
0
131.
5
132.
0
132.
5
133.
0
133.
5
134.
0
134.
5
135.
0
Sep 2010
Oct 2010
Nov 2010
Dec 2010
Jan 2011
Feb 2011
Mar 2011
Apr 2011
May 2011
Jun 2011
Jul 2011
Aug 2011
Sep 2011
Oct 2011
Elevation (in m referenced to NAVD, 1988)
Wat
er-L
evel
Ele
vatio
ns a
t the
La
Gra
nge
USA
CE
Gau
ge a
nd a
n O
n-Si
te D
ata
Logg
er
Illin
ois
Riv
er a
tLa
Gra
nge
US
ACE
gaug
e
Illin
ois
Riv
erflo
od s
tage
at
US
ACE
gaug
e
Wel
l 41S
(logg
er)
69
La G
rang
e W
etla
nd M
itiga
tion
Ban
kSe
ptem
ber 1
, 201
0 th
roug
h O
ctob
er 1
, 201
1
130.
5
131.
0
131.
5
132.
0
132.
5
133.
0
133.
5
134.
0
134.
5
Sep 2010
Oct 2010
Nov 2010
Dec 2010
Jan 2011
Feb 2011
Mar 2011
Apr 2011
May 2011
Jun 2011
Jul 2011
Aug 2011
Sep 2011
Oct 2011
Elevation (in m referenced to NAVD, 1988)
Wat
er-L
evel
Ele
vatio
ns in
Dee
per M
onito
ring
Wel
ls
Wel
l 2M
Wel
l 2L
Wel
l 14M
Wel
l 14L
70
La G
rang
e W
etla
nd M
itiga
tion
Ban
kSe
ptem
ber 1
, 201
0 th
roug
h O
ctob
er 1
, 201
1
-1.0
-0.5 0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Sep 2010
Oct 2010
Nov 2010
Dec 2010
Jan 2011
Feb 2011
Mar 2011
Apr 2011
May 2011
Jun 2011
Jul 2011
Aug 2011
Sep 2011
Oct 2011
Depth (in m referenced to land surface)
Dep
th to
Wat
er in
Dee
per M
onito
ring
Wel
ls
Wel
l 2M
Wel
l 2L
Wel
l 14M
Wel
l 14L
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La Grange Wetland Mitigation BankSeptember 2010 through August 2011
Graph last updated 10/31/2011
0
1
2
3
4
5
6
7
8
9
10
11
Sep
201
0
Oct
201
0
Nov
201
0
Dec
201
0
Jan
2011
Feb
2011
Mar
201
1
Apr
201
1
May
201
1
Jun
2011
Jul 2
011
Aug
201
1
Prec
ipita
tion
(inch
es)
Total Monthly Precipitation Recorded on Site and at Rushville, IL
monthly precipitation recorded at Rushville, IL (MRCC)
monthly precipitation recorded on site by ISGS
data incomplete
1971-2000 monthly 30% above average threshold at Rushville, IL (NWCC)
1971-2000 monthly average precipitation at Rushville, IL (NWCC)
1971-2000 monthly 30% below average threshold at Rushville, IL (NWCC)
on-site rain gauge removed 12/14/2010 installed 02/24/2011
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