U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 06/22/1988
Station ID: 8531369 SUPERCEDED DATE: 04/21/2003
Name: NORTH OLD BRIDGE, SOUTH RIVER
NEW JERSEY
NOAA Chart: 12131 Latitude: 40° 25.0' N
USGS Quad: SOUTH AMBOY Longitude: 74° 21.8' W
To reach the tidal bench marks from Old Bridge proceed east on Amboy Turnpike,
crossing the bridge over the South River to Williams Street, then go left one
block to John Street, turn left and continue to the end of the street. 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
MONUMENTATION: Survey Disk VM#: 2524
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is located in front of a flag pole 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, 95.8 feet (29.2 m) NW of wood utility pole #JC 232 SF, 78.4
feet (23.9 m) from the NW corner of a 2-story frame building, 68.6 feet (20.9 m)
west of the SW corner of the same building, and 13.5 feet (4.1 m) SE of the
outside corner of a timber retaining wall. The bench mark is crimped to a
copper-clad steel rod driven 39 feet (12 m) to refusal, and encased inside a PVC
pipe and concrete.
BENCH MARK STAMPING: H 73 1974
MONUMENTATION: Survey Disk VM#: 2523
AGENCY: PID#: KV0965
SETTING CLASSIFICATION: Bridge Abutment
The bench mark is set in the top of the SE end of the NE abutment of a concrete
bridge over the South River, 795 feet (242 m) NE of the abandoned Penn Central
Railroad Station, 21 feet (6 m) SE of the centerline of Bordentown Avenue, 0.7
foot (0.2 m) SE of an 8-inch diameter pipeline, and at street level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 06/22/1988
Station ID: 8531369 SUPERCEDED DATE: 04/21/2003
Name: NORTH OLD BRIDGE, SOUTH RIVER
NEW JERSEY
NOAA Chart: 12131 Latitude: 40° 25.0' N
USGS Quad: SOUTH AMBOY Longitude: 74° 21.8' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1369 B 1975
MONUMENTATION: Survey Disk VM#: 2525
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is located at the NW corner of the property at 18 John Street,
52.1 feet (15.9 m) west of wood electric pole #JC 15, 25.5 feet (7.7 m) south of
the centerline of John Street, 22.0 feet (6.7 m) NW of the NW corner of a
1-story frame building, and 1.8 feet (0.6 m) SE of the NW corner of a chain link
fence. The bench mark is crimped to a copper-clad steel rod driven 30 feet (9
m) to refusal, and encased in a PVC pipe and concrete.
BENCH MARK STAMPING: 1369 C 1975
MONUMENTATION: Survey Disk VM#: 2526
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is located on the south side of the Penn Central Railroad tracks
along Bordentown Avenue, 155.9 feet (47.5 m) SW of a railroad crossing, 154.2
feet (47.0 m) NE of the NE corner of a steel H-column, 129.8 feet (39.6 m) SW of
the SW corner of a second steel H-column supporting the overhead electrical
wires, and 85.5 feet (26.1 m) NE of a MCSA sewer manhole. The bench mark is
crimped to a copper-clad steel rod driven 36 feet (11.0 m) 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
PUBLICATION DATE: 06/22/1988
Station ID: 8531369 SUPERCEDED DATE: 04/21/2003
Name: NORTH OLD BRIDGE, SOUTH RIVER
NEW JERSEY
NOAA Chart: 12131 Latitude: 40° 25.0' N
USGS Quad: SOUTH AMBOY Longitude: 74° 21.8' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1369 D 1975
MONUMENTATION: Survey Disk VM#: 2527
AGENCY: PID:
SETTING CLASSIFICATION: Footing of Small Structure
The bench mark is set in a 3 foot (0.9 m) diameter circular base of a steel
H-column across from the intersection of William Street and Bordentown Avenue,
123.0 feet (37.5 m) SE of the SE corner of a 2-story brick building, 82.3 feet
(25.1 m) south of a wood utility pole, 69.3 feet (21.1 m) east of milestone NO 7
concrete post, and 8.4 feet (2.6 m) 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
PUBLICATION DATE: 06/22/1988
Station ID: 8531369 SUPERCEDED DATE: 04/21/2003
Name: NORTH OLD BRIDGE, SOUTH RIVER
NEW JERSEY
NOAA Chart: 12131 Latitude: 40° 25.0' N
USGS Quad: SOUTH AMBOY Longitude: 74° 21.8' W
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: 1960-1978
CONTROL TIDE STATION: 8518750 THE BATTERY, NY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (08/09/1976) = 8.79
MEAN HIGHER HIGH WATER MHHW = 6.20
MEAN HIGH WATER MHW = 5.85
MEAN TIDE LEVEL MTL = 3.05
MEAN LOW WATER MLW = 0.24
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (03/17/1976) = -2.78
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
1369 A 1975 9.18 3.33
H 73 1974 13.39 7.54
1369 B 1975 13.47 7.62
1369 C 1975 12.48 6.63
1369 D 1975 14.35 8.50
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 06/22/1988
Station ID: 8531369 SUPERCEDED DATE: 04/21/2003
Name: NORTH OLD BRIDGE, SOUTH RIVER
NEW JERSEY
NOAA Chart: 12131 Latitude: 40° 25.0' N
USGS Quad: SOUTH AMBOY Longitude: 74° 21.8' 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.