U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 6 Station ID: 8534393 PUBLICATION DATE: 05/12/2004 Name: MAIN MARSH THOROFARE NJ NOAA Chart: 12316 Latitude: 39° 28.7' N ( 39.47830) USGS Quad: OCEANVILLE Longitude: 74° 23.0' W ( -74.38330) To reach the tidal bench marks from Oyster Creek, proceed 4.0 km (2.5 mi) SE along the south shore of Great Bay to the Intracoastal Waterway of Main Marsh Thorofare, then proceed 0.6 km (0.4 mi) SW along the thorofare to a small creek on the west bank of Main Marsh. The bench marks are located along the shore of the small creek. The tide gage and staff were located on a wooden platform on the shore of Main Marsh Thorofare. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 4393 D 1977 DESIGNATION: 853 4393 D TIDAL MONUMENTATION: Tidal Station disk VM#: 2683 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 39° 28.7' N ( 39.47830) LONGITUDE: 74° 23.0' W ( -74.38330) The primary bench mark is a disk located 53 m (175 ft) SE of bench mark BM 4 1971, 17.68 m (58.0 ft) east of the east bank of the small creek on the west bank of Main Marsh Thorofare, 16.15 m (53.0 ft) SW of bench mark Z 55 1961, 10.49 m (34.4 ft) SW of a wildlife refuge sign, and 4.57 m (15.0 ft) west of the top of the bank of the Thorofare. The bench mark is set 0.15 m (0.5 ft) above ground level, crimped to the top of a galvanized steel rod driven 15.2 m (50 ft) to refusal, and encased in a PVC pipe and a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 6 Station ID: 8534393 PUBLICATION DATE: 05/12/2004 Name: MAIN MARSH THOROFARE NJ NOAA Chart: 12316 Latitude: 39° 28.7' N ( 39.47830) USGS Quad: OCEANVILLE Longitude: 74° 23.0' W ( -74.38330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: BM 4 1971 DESIGNATION: 853 4393 TIDAL 4 MONUMENTATION: Tidal Station disk VM#: 2681 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Shallow set pipe OPUS PID: LATITUDE: 39° 28.7' N ( 39.47830) LONGITUDE: 74° 23.0' W ( -74.38330) The bench mark is a disk located on the west bank of Main Marsh Thorofare halfway from the entrance to Great Bay, 53 m (175 ft) NW of bench mark 4393 D 1977, 18 m (60 ft) south of the bend of a creek which extends due west from the thorofare, 8 m (25 ft) south of a large piling and approximately on range with the south Brigantine water tower. The bench mark is set 0.15 m (0.5 ft) above ground level, crimped to the top of a pipe driven 3.0 m (10 ft) into the marsh. BENCH MARK STAMPING: BM 6 1971 DESIGNATION: 853 4393 TIDAL 6 MONUMENTATION: Tidal Station disk VM#: 2682 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Unspecified OPUS PID: LATITUDE: 39° 28.7' N ( 39.47830) LONGITUDE: 74° 23.0' W ( -74.38330) The bench mark is a disk located on the west bank of Main Marsh Thorofare near the entrance to a small creek, 53 m (175 ft) NW of bench mark BM 4 1971, 40 m (130 ft) west of bench mark Z 55 1961, 30 m (100 ft) WNW from the bend in the small creek at the point where the creek runs from west to south.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 6 Station ID: 8534393 PUBLICATION DATE: 05/12/2004 Name: MAIN MARSH THOROFARE NJ NOAA Chart: 12316 Latitude: 39° 28.7' N ( 39.47830) USGS Quad: OCEANVILLE Longitude: 74° 23.0' W ( -74.38330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 4393 E 1977 DESIGNATION: 853 4393 E TIDAL MONUMENTATION: Tidal Station disk VM#: 2684 AGENCY: National Ocean Survey (NOS) IDB PID#: SETTING CLASSIFICATION: Galvanized steel rod OPUS PID: LATITUDE: 39° 28.4' N ( 39.47330) LONGITUDE: 74° 23.0' W ( -74.38330) The bench mark is a disk located 51.21 m (168.0 ft) south of bench mark 4393 D 1977, 18.29 m (60.0 ft) SE of the east bank of a small creek, and 12.19 m (40.0 ft) NW of the top of bank of the Thorofare. The bench mark is 0.30 m (1.0 ft) above ground level, crimped to the top of a galvanized steel rod driven 15.24 m (50.0 ft) to refusal, and encased in a PVC pipe and a concrete kickblock.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 6 Station ID: 8534393 PUBLICATION DATE: 05/12/2004 Name: MAIN MARSH THOROFARE NJ NOAA Chart: 12316 Latitude: 39° 28.7' N ( 39.47830) USGS Quad: OCEANVILLE Longitude: 74° 23.0' W ( -74.38330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: Z 55 1961 DESIGNATION: Z 55 MONUMENTATION: Bench Mark disk VM#: 12413 AGENCY: US Coast & Geodetic Survey (USC&GS) IDB PID#: JU0280 SETTING CLASSIFICATION: Metal pipe OPUS PID: LATITUDE: 39° 28.8' N ( 39.48000) LONGITUDE: 74° 23.0' W ( -74.38330) The bench mark is a disk located 27 m (90 ft) west of the west bank of Main Marsh Thorofare, 27 m (88 ft) north of north bank of the creek, and 0.12 m (0.4 ft) above ground level. The bench mark is set on top of a 3-inch galvanized iron pipe.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 6 Station ID: 8534393 PUBLICATION DATE: 05/12/2004 Name: MAIN MARSH THOROFARE NJ NOAA Chart: 12316 Latitude: 39° 28.7' N ( 39.47830) USGS Quad: OCEANVILLE Longitude: 74° 23.0' W ( -74.38330) T I D A L D A T U M S Tidal datums at MAIN MARSH THOROFARE based on: LENGTH OF SERIES: 8 MONTHS TIME PERIOD: April 1978 - November 1978 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8557380 LEWES, FT. MILES Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 1.123 MEAN HIGH WATER MHW = 1.018 MEAN TIDE LEVEL MTL = 0.529 MEAN SEA LEVEL MSL = 0.521 MEAN LOW WATER MLW = 0.040 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 4393 D 1977 1.154 0.136 BM 4 1971 1.207 0.189 BM 6 1971 1.223 0.205 4393 E 1977 1.270 0.252 Z 55 1961 1.260 0.242
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 6 Station ID: 8534393 PUBLICATION DATE: 05/12/2004 Name: MAIN MARSH THOROFARE NJ NOAA Chart: 12316 Latitude: 39° 28.7' N ( 39.47830) USGS Quad: OCEANVILLE Longitude: 74° 23.0' W ( -74.38330) 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 NGS's Integrated Data Base (IDB PID) provides geodetic datum based on traditionally leveled and bluebooked ties to the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/. The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/. 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.