sandy hook nj datum

U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean ServiceDatums Page of 8

Station ID: 8531680 PUBLICATION DATE: 04/21/2003Name: SANDY HOOK NEW JERSEYNOAA Chart: 12327 Latitude: 40° 28.0' NUSGS Quad: SANDY HOOK Longitude: 74° 0.6' W

To reach the tidal bench marks from the Garden State Parkway, north or south,follow lanes marked Local/All Exits, exit 117 - State Highway 36 east for 22.0km (13.7 mi) to the bridge at Atlantic Highlands. Follow signs to Gateway NRA,Sandy Hook, pass toll booths, and then Ocean Road north for 9.2 km (5.7 mi) toU.S. Coast Guard Base Fort Hancock. The bench marks are scattered around theCoast Guard Station, and the gage is located at the south end of U.S.C.G smallpier in a tide house with NOS sign.

T I D A L B E N C H M A R K S

PRIMARY BENCH MARK STAMPING: 1680 D 1980 DESIGNATION: 853 1680 D TIDAL

MONUMENTATION: Tidal Station disk VM#: 326AGENCY: National Ocean Survey (NOS) PID#: AB6711SETTING CLASSIFICATION: Concrete slab

The bench mark is a disk set in the SE corner of a 1.8 m x 1.8 m (6 ft x 6 ft)concrete manhole slab located SW of the headquarters building near the garagecomplex, 22.25 m (73.0 ft) north of the north end of the most westerly pier onthe Coast Guard property, 16.82 m (55.2 ft) SW of the SW corner of the garage,8.50 m (27.9 ft) NE of a light pole, and 0.3 m (1 ft) above ground.

BENCH MARK STAMPING: 1680 A 1979 DESIGNATION: 853 1680 A TIDAL

MONUMENTATION: Tidal Station disk VM#: 317AGENCY: National Ocean Survey (NOS) PID#: KV3519SETTING CLASSIFICATION: Stainless steel rod

The primary bench mark is a disk located at the SE corner of a metal garage,91.4 m (300 ft) east of the headquarters building, 56.54 m (185.5 ft) north ofthe centerline of the road leading to the base, 5.39 m (17.7 ft) south of thesouth rail of tracks running through the garage, and 2.26 m (7.4 ft) south ofthe SE corner of the garage. The bench mark is crimped to a stainless steel roddriven 14.6 m (48 ft) to refusal, and encased in a 4 inch PVC pipe with concretekickblock.

Published Bench Mark Sheet for 8531680 SANDY HOOK NEW JERSEY http://co-ops.nos.noaa.gov/benchmarks/8531680.html

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U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service of 8



BENCH MARK STAMPING: SIMPSON 2 1972 DESIGNATION: SIMPSON 2

MONUMENTATION: Triangulation Station disk VM#: 320AGENCY: National Geodetic Survey (NGS) PID#: KV0709SETTING CLASSIFICATION: Concrete monument

The bench mark is a disk set in a concrete monument, 23.96 m (78.6 ft) east ofthe NE corner of the headquarters building, 5.55 m (18.2 ft) south of the SEcorner of a parking lot, 2.70 m (8.9 ft) west of the west curb of Crispin Road,0.76 m (2.5 ft) SE of a witness post, and is 0.08 m (0.3 ft) below grade.

BENCH MARK STAMPING: SIMPSON 2 NO 3 1972 DESIGNATION: SIMPSON 2 RM 3

MONUMENTATION: Reference Mark disk VM#: 321AGENCY: National Geodetic Survey (NGS) PID#: KV0707SETTING CLASSIFICATION: Concrete monument

The bench mark is a disk set in a concrete monument, 41.45 m (136.0 ft) east ofthe east wall of the headquarters building, 17.07 m (56.0 ft) east of a firehydrant, 9.95 m (32.6 ft) east of the centerline of Crispin Road, and 0.30 m(1.0 ft) west of a witness post.


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BENCH MARK STAMPING: 8 1932 DESIGNATION: 853 1680 TIDAL 8

MONUMENTATION: Tidal Station disk VM#: 322AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: KV0712SETTING CLASSIFICATION: Concrete monument

The bench mark is a disk set in a concrete monument, 8.99 m (29.5 ft) NE of theNW corner of Building 102, 4.27 m (14.0 ft) NW of steps heading east, 3.20 m(10.5 ft) east of the east edge of the concrete walk, 3.0 m (10 ft) north of theNE corner of the north wing of the building, 0.76 m (2.5 ft) north of the northedge of the concrete walk, and 0.06 m (0.2 ft) above ground.

BENCH MARK STAMPING: S 80 1979 DESIGNATION: S 80

MONUMENTATION: Flange-encased Rod VM#: 323AGENCY: National Geodetic Survey (NGS) PID#: KV3521SETTING CLASSIFICATION: Stainless steel rod in sleeve

The bench mark is located at the east corner of the headquarters building, 35.1m (115 ft) NW of the NW curb of Canfield Road, 29.78 m (97.7 ft) SW of the SWcurb of Hartshore Drive, 11.0 m (36 ft) east of the center of the SE doubledoors to the building, and 0.61 m (2.0 ft) SE of the east corner of thebuilding. The datum point is the top of a stainless steel rod driven 9.14 m(30.0 ft) to refusal, in a sleeve extending to a depth of 3.05 m (10.0 ft), andencased in a 5 inch NGS logo cap.


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BENCH MARK STAMPING: 1680 C 1979 DESIGNATION: 853 1680 C

MONUMENTATION: Tidal Station disk VM#: 325AGENCY: National Ocean Survey (NOS) PID: SETTING CLASSIFICATION: Stainless steel rod

The bench mark is a disk located at the SW corner of the Sandy Hook FireDepartment, 57.97 m (190.2 ft) SE of the large cannon at the entrance of thebase, 6.10 m (20.0 ft) east of the centerline of Kearney Street, and 1.52 m (5.0ft) SW of the SW corner of the Sandy Hook Fire Department building. The benchmark is crimped to a stainless steel rod driven 12.8 m (42 ft) to refusal, andencased in 4 inch PVC pipe with concrete kickblock.

BENCH MARK STAMPING: 1680 E 1990 DESIGNATION: 853 1680 E TIDAL

MONUMENTATION: Tidal Station disk VM#: 327AGENCY: National Ocean Service (NOS) PID#: AB6710SETTING CLASSIFICATION: Concrete slab

The bench mark is a disk set in the 1.8 m x 3.0 m (8 ft x 10 ft) concrete slabfor a bus stop shelter located along the north edge of the parking lot on thewest side of Crispin Road, 39.75 m (130.4 ft) west of the NE corner of parkinglot, 32.10 m (105.3 ft) east of a fire hydrant, 2.47 m (8.1 ft) NNE of the northedge of the north parking lot, 0.15 m (0.5 ft) NE of the NE corner of the slab,and 0.15 m (0.5 ft) above the parking lot.


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BENCH MARK STAMPING: 1680 F 1990 DESIGNATION: 853 1680 F

MONUMENTATION: Tidal Station disk VM#: 328AGENCY: National Ocean Service (NOS) PID: SETTING CLASSIFICATION: Stainless steel rod

The bench mark is a disk located east of the intersection of Kearney Street andCanfield Roads, 46.0 m (151 ft) east of the centerline of the entrance gate tothe base, 20.27 m (66.5 ft) ESE of a fire hydrant, 14.97 m (49.1 ft) south ofthe centerline of the road leading to the park service maintenance area, and0.85 m (2.8 ft) WNW of the west corner post of an eight feet high chain linkfence. The bench mark is 0.09 m (0.3 ft) below ground, crimped to a stainlesssteel rod driven 14.6 m (48 ft), and encased in a 4 inch PVC pipe with concretekickblock.

BENCH MARK STAMPING: FORT HANCOCK NO 4 1940 DESIGNATION: FORT HANCOCK RM 4

MONUMENTATION: Reference Mark disk VM#: 15582AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: KV0701SETTING CLASSIFICATION: Concrete tower leg foundation

At Fort Hancock, at the old abandoned Coast Guard building at the NW end of aparking lot, the mark is set in the concrete foundation at the NE leg of a steeltower, and 0.2 m (0.7 ft) above ground.


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BENCH MARK STAMPING: DESIGNATION: USED

MONUMENTATION: Bolt VM#: 15584AGENCY: PID#: KV0714SETTING CLASSIFICATION: Concrete monument

The bench mark is a bolt set in a concrete monument near the Sandy Hook NationalPark headquarters flagpole, 50.51 m (165.7 ft) east of Kessler Avenue, 11.73 m(38.5 ft) NNE of the flagpole, and 10.70 m (35.1 ft) SSW of the centerline ofHudson Road.


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T I D A L D A T U M S

Tidal datums at SANDY HOOK based on:

LENGTH OF SERIES: 19 Years TIME PERIOD: January 1983 - December 2001 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION:

Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

HIGHEST OBSERVED WATER LEVEL (09/12/1960) = 3.074 MEAN HIGHER HIGH WATER MHHW = 1.592 MEAN HIGH WATER MHW = 1.492 North American Vertical Datum NAVD88 = 0.858 MEAN SEA LEVEL MSL = 0.785 MEAN TIDE LEVEL MTL = 0.775 MEAN LOW WATER MLW = 0.058 MEAN LOWER LOW WATER MLLW = 0.000 LOWEST OBSERVED WATER LEVEL (02/02/1976) = -1.437

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information In METERS above:

Stamping or Designation MLLW MHW

1680 D 1980 2.917 1.426 1680 A 1979 2.812 1.320 SIMPSON 2 1972 2.963 1.471 SIMPSON 2 NO 3 1972 2.945 1.453 8 1932 4.524 3.032 S 80 1979 3.404 1.912 1680 C 1979 3.268 1.776 1680 E 1990 3.618 2.126 1680 F 1990 2.653 1.161 FORT HANCOCK NO 4 1940 3.808 2.317 USED 2.916 1.424


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D E F I N I T I O N S

Mean Sea Level (MSL) is a tidal datum determined over a 19-year National TidalDatum Epoch. It pertains to local mean sea level and should not be confusedwith the fixed datums of North American Vertical Datum of 1988 (NAVD88).

NAVD88 is a fixed datum derived from a simultaneous, least squares, minimumconstraint adjustment of Canadian/Mexican/United States leveling observations.Local mean sea level observed at Father Point/Rimouski, Canada was held fixed asthe single initial constraint. NAVD88 replaces NGVD29 as the nationalstandard geodetic reference for heights. Bench mark elevations relative toNAVD88 are available from NGS through the World Wide Web at National Geodetic Survey.

NGVD29 is a fixed datum adopted as a national standard geodetic reference forheights but is now considered superseded. NGVD29 is sometimes referred to asSea Level Datum of 1929 or as Mean Sea Level on some early issues of GeologicalSurvey Topographic Quads. NGVD29 was originally derived from a generaladjustment of the first-order leveling networks of the U.S. and Canada afterholding mean sea level observed at 26 long term tide stations as fixed.Numerous local and wide-spread adjustments have been made since establishment in1929. Bench mark elevations relative to NGVD29 are available from the NationalGeodetic Survey (NGS) data base via the World Wide Web at National Geodetic Survey.

NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships tolocal MSL and other tidal datums may not be consistent from one location toanother.

The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are uniqueidentifiers for bench marks in the tidal and geodetic databases, respectively.Each bench mark in either database has a single, unique VM# and/or PID# assigned.Where both VM# and PID# are indicated, both tidal and geodetic elevations areavailable for the bench mark listed.

The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referredto MLLW only when two or more of the bench marks listed have NAVD88 elevations.The NAVD88 elevation relationship shown in the table is derived from an averageof several bench mark elevations relative to tide station datum. As a result ofthis averaging, NAVD88 bench mark elevations computed indirectly from the tidaldatums elevation table may differ slightly from NAVD88 elevations listed foreach bench mark in the NGS database.


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sandy hook nj datum

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