U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 06/29/1988
Station ID: 8535001 SUPERCEDED DATE: 04/21/2003
Name: CEDAR SWAMP CREEK, TUCKAHOE RIVER, GREAT EGG HARBO
NEW JERSEY
NOAA Chart: 12318 Latitude: 39° 14.8' N
USGS Quad: MARMORA Longitude: 74° 43.1' W
To reach the tidal bench marks from the intersection of State Highway 585 and
State Highway 50 in Petersburg, proceed 0.8 mile (1.3 km) ESE along State
Highway 50 to the SW abutment of the bridge over Cedar Swamp Creek. The bench
marks are along State Highway 50. The tide gage and staff were on a platform
attached to the bridge over Cedar Swamp.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5001 A 1978
MONUMENTATION: Survey Disk VM#: 2745
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is set flush in the top of the concrete abutment, 168 feet (51 m)
south of Bench Mark 5001 C 1978, 23.2 feet (7.1 m) SW of the centerline of State
Highway 50, 3.0 feet (0.9 m) SW of the concrete curb, and 1.1 feet (0.3 m) NE of
the SW face of the abutment.
BENCH MARK STAMPING: 5001 B 1978
MONUMENTATION: Survey Disk VM#: 2746
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush in the top of a concrete footing for an old building
on the east side of the Penn Reading Seashore Line railroad tracks, 275 feet (84
m) SE of Bench Mark 5001 A 1978, 37.1 feet (11.3 m) NW of a wood utility pole,
10.0 feet (3.0 m) south of the westernmost corner of the concrete footing, 7.5
feet (2.3 m) NE of the east rail of the railroad track, and 2.8 feet (0.9 m)
west of the mid SE corner of the footing.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 06/29/1988
Station ID: 8535001 SUPERCEDED DATE: 04/21/2003
Name: CEDAR SWAMP CREEK, TUCKAHOE RIVER, GREAT EGG HARBO
NEW JERSEY
NOAA Chart: 12318 Latitude: 39° 14.8' N
USGS Quad: MARMORA Longitude: 74° 43.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5001 C 1978
MONUMENTATION: Survey Disk VM#: 2747
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is 204 feet (62 m) SE of Bench Mark 5001 D 1978, 23.3 feet (7.1
m) NE of the centerline of State Highway 50, 3.0 feet (0.9 m) NE of the concrete
curb, and 1.1 feet (0.3 m) SE of the NE face of the abutment.
BENCH MARK STAMPING: 5001 D 1978
MONUMENTATION: Survey Disk VM#: 2748
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is 81.0 feet (24.7 m) SE of a wood utility pole, 48.6 feet (14.8
m) west of wood utility pole #177 , 25.2 feet (7.7 m) SW of the centerline of
State Highway 50, 7.5 feet (2.3 m) west of the SE end of a steel guard rail, and
3.9 feet (1.2 m) SW of a steel guard rail. The bench mark is 0.2 foot (0.1 m)
below ground level, crimped to a galvanized 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: 06/29/1988
Station ID: 8535001 SUPERCEDED DATE: 04/21/2003
Name: CEDAR SWAMP CREEK, TUCKAHOE RIVER, GREAT EGG HARBO
NEW JERSEY
NOAA Chart: 12318 Latitude: 39° 14.8' N
USGS Quad: MARMORA Longitude: 74° 43.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5001 E 1978
MONUMENTATION: Survey Disk VM#: 2749
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is 336 feet (102 m) NW of Bench Mark 5001 D 1978, 22.9 feet (7.0
m) SW of the centerline of State Highway 50, 18.0 feet (5.5 m) north of a 0.2
foot (0.1 m) diameter cedar tree, 3.8 feet (1.2 m) west of a steel sign reading
Bridge May Be Slippery, and 1.9 feet (0.6 m) SW of a steel guard rail. The
bench mark is 0.2 foot (0.1 m) below ground level, crimped to a galvanized 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: 06/29/1988
Station ID: 8535001 SUPERCEDED DATE: 04/21/2003
Name: CEDAR SWAMP CREEK, TUCKAHOE RIVER, GREAT EGG HARBO
NEW JERSEY
NOAA Chart: 12318 Latitude: 39° 14.8' N
USGS Quad: MARMORA Longitude: 74° 43.1' W
T I D A L D A T U M S
Tidal datums at CEDAR SWAMP CREEK, TUCKAHOE RIVER, GREAT EGG HARBO based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: JUNE-SEPTEMBER 1978
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8534883 TUCKAHOE NO. 1, NJ
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (07/04/1978) = 4.41
MEAN HIGHER HIGH WATER MHHW = 3.53
MEAN HIGH WATER MHW = 3.31
MEAN TIDE LEVEL MTL = 1.79
MEAN LOW WATER MLW = 0.26
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (10/10/1978) = -0.98
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
5001 A 1978 10.15 6.84
5001 B 1978 6.22 2.91
5001 C 1978 10.15 6.84
5001 D 1978 7.15 3.84
5001 E 1978 7.67 4.36
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 06/29/1988
Station ID: 8535001 SUPERCEDED DATE: 04/21/2003
Name: CEDAR SWAMP CREEK, TUCKAHOE RIVER, GREAT EGG HARBO
NEW JERSEY
NOAA Chart: 12318 Latitude: 39° 14.8' N
USGS Quad: MARMORA Longitude: 74° 43.1' 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.