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Station ID: 8531223 SUPERCEDED DATE: 04/21/2003
Name: CHEESEQUAKE CREEK (GSP)
NEW JERSEY
NOAA Chart: 12131 Latitude: 40° 27.2' N
USGS Quad: SOUTH AMBOY Longitude: 74° 16.4' W
To reach the tidal bench marks proceed 1.0 mile (1.6 km) SW of the State Highway
Bridge over the Cheesequake Creek at Morgan. The bench marks are at and in the
near area of the Garden State Parkway (GSP) bridges over the Cheesequake Creek.
The tide gage and staff were located on the dock at the Morgan Marina.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1223 A 1975
MONUMENTATION: Survey Disk VM#: 2513
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Retaining Wall
The bench mark is set in the SE corner of a concrete retaining wall near the NE
abutment of the east bridge of the Garden State Parkway bridge, 36.1 feet (11.0
m) SW of the southerly corner of a concrete wall supporting a drainage pipe, 3.3
feet (1.0 m) south of the abutment, 1.6 feet (0.5 m) NW of the concrete wall
corner, and 9.8 feet (3.0 m) below pavement level.
BENCH MARK STAMPING: 1223 B 1975
MONUMENTATION: Survey Disk VM#: 2514
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is 0.1 mile (0.2 km) NW of the east bridge abutment of the Garden
State Parkway bridge, 129.4 feet (39.4 m) north of the NE corner of a nearby
drain, 22.2 feet (6.8 m) east of the east edge of the pavement, and 20.6 feet
(6.3 m) SE of the end of a concrete and wood guard rail. The bench mark is
crimped to a copper-clad steel rod driven 44 feet (13 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 2 of 5
PUBLICATION DATE: 06/22/1988
Station ID: 8531223 SUPERCEDED DATE: 04/21/2003
Name: CHEESEQUAKE CREEK (GSP)
NEW JERSEY
NOAA Chart: 12131 Latitude: 40° 27.2' N
USGS Quad: SOUTH AMBOY Longitude: 74° 16.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1223 C 1975
MONUMENTATION: Survey Disk VM#: 2515
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is 0.4 mile (0.6 km) north of the Parkway bridge over Cheesequake
Creek, 190 feet (58 m) north of the north end of the wood guard rail, 46.3 feet
(14.1 m) west of a 2-foot (0.6 m) diameter twin oak, and 38.7 feet (11.8 m) east
of the east edge of the pavement. The bench mark is crimped to a copper-clad
steel rod driven 41 feet (12 m) to refusal, and encased in a PVC pipe and
concrete.
BENCH MARK STAMPING: 1223 D 1975
MONUMENTATION: Survey Disk VM#: 2516
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is just south of the Ernston Road underpass of the Garden State
Parkway, 84.4 feet (25.7 m) SE of the center of a nearby drain, 31.2 feet (9.5
m) east of the east edge of the pavement, and 9.0 feet (2.7 m) west of the top
of the slope. The bench mark is 0.2 foot (0.1 m) below ground level, crimped to
a copper-clad steel rod driven 48 feet (14 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: 8531223 SUPERCEDED DATE: 04/21/2003
Name: CHEESEQUAKE CREEK (GSP)
NEW JERSEY
NOAA Chart: 12131 Latitude: 40° 27.2' N
USGS Quad: SOUTH AMBOY Longitude: 74° 16.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1223 E 1975
MONUMENTATION: Survey Disk VM#: 2517
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is set vertically into the east face of the abutment, in the SE
corner of the most easterly Parkway bridge over Ernston Road, 82.0 feet (25.0 m)
SW of the 2-foot (0.6 m) diameter manhole on Ernston Road, 66.2 feet (20.2 m)
west of the easterly end of a wood and steel guard rail, 9.6 feet (2.9 m) from
the SE corner, and 2.3 feet (0.7 m) below the level of the Parkway surface.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 06/22/1988
Station ID: 8531223 SUPERCEDED DATE: 04/21/2003
Name: CHEESEQUAKE CREEK (GSP)
NEW JERSEY
NOAA Chart: 12131 Latitude: 40° 27.2' N
USGS Quad: SOUTH AMBOY Longitude: 74° 16.4' W
T I D A L D A T U M S
Tidal datums at CHEESEQUAKE CREEK (GSP) based on:
LENGTH OF SERIES: 10 MONTHS
TIME PERIOD: FEBRUARY - NOVEMBER 1976
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8531680 SANDY HOOK
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (08/09/1976) = 7.57
MEAN HIGHER HIGH WATER MHHW = 5.61
MEAN HIGH WATER MHW = 5.30
MEAN TIDE LEVEL MTL = 2.76
MEAN LOW WATER MLW = 0.22
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (02/02/1976) = -4.26
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
1223 A 1975 0.00 11.40
1223 B 1975 0.00 29.77
1223 C 1975 0.00 50.48
1223 D 1975 0.00 59.70
1223 E 1975 0.00 62.85
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 06/22/1988
Station ID: 8531223 SUPERCEDED DATE: 04/21/2003
Name: CHEESEQUAKE CREEK (GSP)
NEW JERSEY
NOAA Chart: 12131 Latitude: 40° 27.2' N
USGS Quad: SOUTH AMBOY Longitude: 74° 16.4' 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.