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National Ocean Service
Datums Page Page 1 of 5
Station ID: 8531369 PUBLICATION DATE: 06/16/2004
Name: NORTH OLD BRIDGE, SOUTH RIVER
NJ
NOAA Chart: 12131 Latitude: 40° 25.0' N ( 40.41670)
USGS Quad: SOUTH AMBOY Longitude: 74° 21.8' W ( -74.36330)
To reach the tidal bench marks from Old Bridge, proceed NE on Amboy Turnpike
(County Route 615) to the first street on the left after crossing the bridge
over the South River, then turn left and proceed NNW on Williams Street for one
block, then turn left and proceed SW on John Street to its end. The bench marks
are in the vicinity of John Street and the railroad tracks. The tide gage and
staff were on the wharf on the South River, parallel to John Street.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1369 A 1975
DESIGNATION: 853 1369 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 2524
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper clad steel rod OPUS PID:
LATITUDE: 40° 25.0' N ( 40.41670) LONGITUDE: 74° 21.8' W ( -74.36330)
The primary bench mark is a disk located in front of a flagpole at 5 John Street
near the Bordentown Avenue Bridge over South River, on the east side of the
river at the end of John Street, 29.20 m (95.8 ft) NW of wood utility pole #JC
232 SF, 23.90 m (78.4 ft) from the NW corner of a 2-story frame building, 20.91
m (68.6 ft) west of the SW corner of the same building, and 4.11 m (13.5 ft) SE
of the outside corner of a timber retaining wall. The bench mark is crimped to
the top of a copper-clad steel rod driven 11.9 m (39 ft) to refusal, and encased
inside a PVC pipe and concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8531369 PUBLICATION DATE: 06/16/2004
Name: NORTH OLD BRIDGE, SOUTH RIVER
NJ
NOAA Chart: 12131 Latitude: 40° 25.0' N ( 40.41670)
USGS Quad: SOUTH AMBOY Longitude: 74° 21.8' W ( -74.36330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: H 73 1974
DESIGNATION: H 73
MONUMENTATION: Bench Mark disk VM#: 2523
AGENCY: National Geodetic Survey (NGS) IDB PID#: KV0965
SETTING CLASSIFICATION: Bridge abutment OPUS PID:
LATITUDE: 40° 25.0' N ( 40.41670) LONGITUDE: 74° 21.7' W ( -74.36170)
The bench mark is a disk set in the top of the SE end of the NE abutment of a
concrete bridge over the South River, 242 m (795 ft) NE of the abandoned Penn
Central Railroad Station, 6 m (21 ft) SE of the centerline of Bordentown Avenue,
0.21 m (0.7 ft) SE of an 8-inch diameter pipeline, and at street level.
BENCH MARK STAMPING: 1369 B 1975
DESIGNATION: 853 1369 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 2525
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper clad steel rod OPUS PID:
LATITUDE: 40° 25.0' N ( 40.41670) LONGITUDE: 74° 21.8' W ( -74.36330)
The bench mark is a disk located at the NW corner of the property at 18 John
Street, 16 m (52 ft) west of wood electric pole #JC 15, 7.77 m (25.5 ft) south
of the centerline of John Street, 6.71 m (22.0 ft) NW of the NW corner of a
1-story frame building, and 0.55 m (1.8 ft) SE of the NW corner of a chain link
fence. The bench mark is crimped to the top of a copper-clad steel rod driven
9.1 m (30 ft) to refusal, and encased in a PVC pipe and concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8531369 PUBLICATION DATE: 06/16/2004
Name: NORTH OLD BRIDGE, SOUTH RIVER
NJ
NOAA Chart: 12131 Latitude: 40° 25.0' N ( 40.41670)
USGS Quad: SOUTH AMBOY Longitude: 74° 21.8' W ( -74.36330)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1369 C 1975
DESIGNATION: 853 1369 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 2526
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper clad steel rod OPUS PID:
LATITUDE: 40° 25.0' N ( 40.41670) LONGITUDE: 74° 21.8' W ( -74.36330)
The bench mark is a disk located on the south side of the Penn Central Railroad
tracks along Bordentown Avenue, 47.52 m (155.9 ft) SW of a railroad crossing,
47.00 m (154.2 ft) NE of the NE corner of a steel H-column, 39.56 m (129.8 ft)
SW of the SW corner of a second steel H-column supporting the overhead
electrical wires, and 26.06 m (85.5 ft) NE of a MCSA sewer manhole. The bench
mark is crimped to the top of a copper-clad steel rod driven 11.0 m (36 ft) to
refusal, and encased in a PVC pipe and concrete.
BENCH MARK STAMPING: 1369 D 1975
DESIGNATION: 853 1369 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 2527
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Base for column OPUS PID:
LATITUDE: 40° 25.0' N ( 40.41670) LONGITUDE: 74° 21.8' W ( -74.36330)
The bench mark is a disk set in a 1 m (3 ft) diameter circular base for a steel
H-column across from the intersection of William Street and Bordentown Avenue,
37.49 m (123.0 ft) SE of the SE corner of a 2-story brick building, 25.09 m
(82.3 ft) south of a wood utility pole, 21.12 m (69.3 ft) east of milestone NO 7
concrete post, and 2.56 m (8.4 ft) south of the most southerly rail of the
Pennsylvania Railroad tracks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8531369 PUBLICATION DATE: 06/16/2004
Name: NORTH OLD BRIDGE, SOUTH RIVER
NJ
NOAA Chart: 12131 Latitude: 40° 25.0' N ( 40.41670)
USGS Quad: SOUTH AMBOY Longitude: 74° 21.8' W ( -74.36330)
T I D A L D A T U M S
Tidal datums at NORTH OLD BRIDGE, SOUTH RIVER based on:
LENGTH OF SERIES: 9 MONTHS
TIME PERIOD: March 1976 - November 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8518750 THE BATTERY, NEW YORK HARBOR
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.867
MEAN HIGH WATER MHW = 1.766
MEAN SEA LEVEL MSL = 0.948
MEAN TIDE LEVEL MTL = 0.916
MEAN LOW WATER MLW = 0.066
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1369 A 1975 2.728 0.962
H 73 1974 4.010 2.244
1369 B 1975 4.034 2.268
1369 C 1975 3.735 1.969
1369 D 1975 4.305 2.539
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8531369 PUBLICATION DATE: 06/16/2004
Name: NORTH OLD BRIDGE, SOUTH RIVER
NJ
NOAA Chart: 12131 Latitude: 40° 25.0' N ( 40.41670)
USGS Quad: SOUTH AMBOY Longitude: 74° 21.8' W ( -74.36330)
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.