U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 5 PUBLICATION DATE: 05/25/1988 Station ID: 8534287 SUPERCEDED DATE: 04/21/2003 Name: LITTLE SHEEPSHEAD CREEK, GREAT BAY NEW JERSEY NOAA Chart: 12316 Latitude: 39° 31.1' N USGS Quad: TUCKERTON Longitude: 74° 19.2' W To reach the tidal bench marks from the Post Office at Tuckerton, proceed 0.3 mile (0.5 km) south on Great Bay Boulevard, 400 feet (122 m) north of the bridge over Little Sheepshead Creek. The bench marks are located along Great Bay Boulevard. The tide gage and staff were located on a old warehouse pier. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1974 MONUMENTATION: Survey Disk VM#: 2671 AGENCY: PID#: JU0236 SETTING CLASSIFICATION: Concrete Foundation The bench mark is set in the SE corner of a concrete barge loading platform at the waters edge, 126.9 feet (38.7 m) SW of the SE corner of a 1-story fish products warehouse, 116.1 feet (35.4 m) west of wood utility pole #P18927, 84.0 feet (25.6 m) west of the centerline of Great Bay Boulevard, 6.2 feet (1.9 m) NE of a witness post, and 1.0 foot (0.3 m) NW of the SE corner of the concrete platform. BENCH MARK STAMPING: P 55 1961 MONUMENTATION: Survey Disk VM#: 2670 AGENCY: PID#: JU0238 SETTING CLASSIFICATION: Concrete Monument The bench mark is set in a tile filled with concrete and set on top of a 5-foot (1.5 m) long cedar post 41.5 feet (12.6 m) east of the centerline of the road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 5 PUBLICATION DATE: 05/25/1988 Station ID: 8534287 SUPERCEDED DATE: 04/21/2003 Name: LITTLE SHEEPSHEAD CREEK, GREAT BAY NEW JERSEY NOAA Chart: 12316 Latitude: 39° 31.1' N USGS Quad: TUCKERTON Longitude: 74° 19.2' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4287 A 1976 MONUMENTATION: Survey Disk VM#: 2672 AGENCY: PID: SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is 192.7 feet (58.7 m) SE of Bench Mark NO 1 1974, 171 feet (52 m) north of the south face of the north timber abutment of the wooden bridge over Little Sheepshead Creek, 23.2 feet (7.1 m) east of the centerline of Great Bay Boulevard, and 3.6 feet (1.1 m) south of wood utility pole #P37918. The bench mark is set 0.1 foot (0.03 m) below ground level, crimped to a copper-clad steel rod driven 50 feet (15 m) to refusal, and encased in a PVC pipe and concrete kickblock. BENCH MARK STAMPING: 4319 B 1976 MONUMENTATION: Survey Disk VM#: 2673 AGENCY: PID: SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is 49.8 feet (15.2 m) east of the SE corner of the easterly end of the walkway leading to the former Little Egg Coast Guard Station, 19.4 feet (5.9 m) east of the centerline of Great Bay Boulevard, and 5.9 feet (1.8 m) south of wood utility pole #T6619. The bench mark is set 0.1 foot (0.03 m) below ground level, crimped to a copper-clad steel rod driven 50 feet (15 m) to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 5 PUBLICATION DATE: 05/25/1988 Station ID: 8534287 SUPERCEDED DATE: 04/21/2003 Name: LITTLE SHEEPSHEAD CREEK, GREAT BAY NEW JERSEY NOAA Chart: 12316 Latitude: 39° 31.1' N USGS Quad: TUCKERTON Longitude: 74° 19.2' W T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4319 C 1976 MONUMENTATION: Survey Disk VM#: 2674 AGENCY: PID: SETTING CLASSIFICATION: Copper-clad Steel Rod The bench mark is 0.1 mile (0.2 km) north of Bench Mark 4319 B 1976, NE of wood utility pole #P18944, and 18.7 feet (5.7 m) east of the centerline of Great Bay Boulevard. The bench mark is 0.2 foot (0.1 m) below ground level, crimped to a copper-clad steel rod driven 50 feet (15 m) to refusal, and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 5 PUBLICATION DATE: 05/25/1988 Station ID: 8534287 SUPERCEDED DATE: 04/21/2003 Name: LITTLE SHEEPSHEAD CREEK, GREAT BAY NEW JERSEY NOAA Chart: 12316 Latitude: 39° 31.1' N USGS Quad: TUCKERTON Longitude: 74° 19.2' W T I D A L D A T U M S Tidal datums at LITTLE SHEEPSHEAD CREEK, GREAT BAY based on: LENGTH OF SERIES: 9 MONTHS TIME PERIOD: MARCH 1977 - NOVEMBER 1977 TIDAL EPOCH: 1960-1978 CONTROL TIDE STATION: 8557380 LEWES, DE Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET: HIGHEST OBSERVED WATER LEVEL (10/14/1977) = 6.45 MEAN HIGHER HIGH WATER MHHW = 3.64 MEAN HIGH WATER MHW = 3.28 MEAN TIDE LEVEL MTL = 1.70 MEAN LOW WATER MLW = 0.13 MEAN LOWER LOW WATER MLLW = 0.00 LOWEST OBSERVED WATER LEVEL (01/22/1977) = -1.97 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In FEET above: Stamping or Designation MLLW MHW NO 1 1974 7.17 3.89 P 55 1961 4.73 1.45 4287 A 1976 11.30 8.02 4319 B 1976 5.54 2.26 4319 C 1976 4.70 1.42
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 5 PUBLICATION DATE: 05/25/1988 Station ID: 8534287 SUPERCEDED DATE: 04/21/2003 Name: LITTLE SHEEPSHEAD CREEK, GREAT BAY NEW JERSEY NOAA Chart: 12316 Latitude: 39° 31.1' N USGS Quad: TUCKERTON Longitude: 74° 19.2' W 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 Tidal Datum Epoch. It pertains to local mean sea level and should not be confused with the fixed datums of North American Vertical Datum of 1988 (NAVD88). NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum constraint adjustment of Canadian/Mexican/United States leveling observations. Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as the single initial constraint. NAVD88 replaces NGVD29 as the national standard geodetic reference for heights. Bench mark elevations relative to NAVD88 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 for heights but is now considered superseded. NGVD29 is sometimes referred to as Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological Survey Topographic Quads. NGVD29 was originally derived from a general adjustment of the first-order leveling networks of the U.S. and Canada after holding mean sea level observed at 26 long term tide stations as fixed. Numerous local and wide-spread adjustments have been made since establishment in 1929. Bench mark elevations relative to NGVD29 are available from the National Geodetic Survey (NGS) data base via the World Wide Web at National Geodetic Survey. NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to local MSL and other tidal datums may not be consistent from one location to another. The Vertical Mark Number (VM#) and PID# shown on the bench mark sheet are unique identifiers 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 are available for the bench mark listed. The NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred to 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 average of several bench mark elevations relative to tide station datum. As a result of this averaging, NAVD88 bench mark elevations computed indirectly from the tidal datums elevation table may differ slightly from NAVD88 elevations listed for each bench mark in the NGS database.