U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 06/20/1988
Station ID: 8538875 SUPERCEDED DATE: 04/21/2003
Name: POMPESTON CREEK, DELAWARE RIVER
NEW JERSEY
NOAA Chart: 12314 Latitude: 40° 0.8' N
USGS Quad: FRANK FORD Longitude: 75° 0.5' W
To reach the tidal bench marks from the intersection of North Broad Street and
Public Street in Riverton, proceed 1.6 miles (2.5 km) NE along North Broad
Street to Canal Avenue, then 0.1 mile (0.2 km) along Canal Avenue to Lippincott
Boat Works. The bench marks are located along Canal Avenue and North Broad
Street. The tide gage and staff were located behind the boat works building on
two boat hoist ramps.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8875 A 1977
MONUMENTATION: Survey Disk VM#: 2870
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is 78.3 feet (23.9 m) NW of the NW corner of the 2-story concrete
block Arthur Jervis Tool Company building, 77.9 feet (23.7 m) south of the SE
corner of the office building, 76.1 feet (23.2 m) north of the SW corner of the
same building, and 61.5 feet (18.7 m) SW of wood utility pole #60750CN. The
bench mark is 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.
BENCH MARK STAMPING: 8875 B 1977
MONUMENTATION: Survey Disk VM#: 2871
AGENCY: PID#: AB6684
SETTING CLASSIFICATION: Concrete Bridge
The bench mark is set in the top of the NW corner of the bridge over the
Pompeston Creek, 370 feet (113 m) SE of Bench Mark 8875 A 1977, 32.6 feet (9.9
m) SW of utility pole #E63348CN, 5.2 feet (1.6 m) NW of the NW curb of North
Broad Street, and 0.4 foot (0.1 m) SE of the NW bridge wall. The bench mark is
level with the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 06/20/1988
Station ID: 8538875 SUPERCEDED DATE: 04/21/2003
Name: POMPESTON CREEK, DELAWARE RIVER
NEW JERSEY
NOAA Chart: 12314 Latitude: 40° 0.8' N
USGS Quad: FRANK FORD Longitude: 75° 0.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8875 C 1977
MONUMENTATION: Survey Disk VM#: 2872
AGENCY: PID#: AB6685
SETTING CLASSIFICATION: Concrete Sidewalk
The bench mark is set in top of the SE bridge corner sidewalk, 24.3 feet (7.4 m)
NW of the NW rail of the nearby railroad tracks, 11.2 feet (3.4 m) NE of the
south end of a concrete bridge wall, and 1.0 foot (0.3 m) SE of the SE curb of
North Broad Street.
BENCH MARK STAMPING: 8875 D 1977
MONUMENTATION: Survey Disk VM#: 2873
AGENCY: PID#: AB6683
SETTING CLASSIFICATION: Concrete Base
The bench mark is set in top of a concrete manhole base, 370.8 feet (113.0 m) SW
of Bench Mark 8875 C 1977, 71.8 feet (21.9 m) NE of wood utility pole #60320T,
22.6 feet (6.9 m) NE of a fire hydrant, 14.2 feet (4.3 m) NW of the west curb of
North Broad Street, and 2.3 feet (0.7 m) SE of a water valve.
BENCH MARK STAMPING: V 75 1974
MONUMENTATION: Survey Disk VM#: 2874
AGENCY: PID#: KV1863
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is set in the top of the south end of the NE abutment of the
railroad bridge over Pompeston Creek, 48.3 feet (14.7 m) south of the NE corner
of North Broad Street bridge over the creek, and 15.8 feet (4.8 m) SE of the SE
rail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 06/20/1988
Station ID: 8538875 SUPERCEDED DATE: 04/21/2003
Name: POMPESTON CREEK, DELAWARE RIVER
NEW JERSEY
NOAA Chart: 12314 Latitude: 40° 0.8' N
USGS Quad: FRANK FORD Longitude: 75° 0.5' W
T I D A L D A T U M S
Tidal datums at POMPESTON CREEK, DELAWARE RIVER based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: OCTOBER-NOVEMBER 1977
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8545530 PHILADELPHIA, PA
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (12/28/1977) = 10.06
MEAN HIGHER HIGH WATER MHHW = 6.77
MEAN HIGH WATER MHW = 6.41
MEAN TIDE LEVEL MTL = 3.26
MEAN LOW WATER MLW = 0.11
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (11/20/1977) = -0.06
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
8875 A 1977 7.39 0.98
8875 B 1977 14.15 7.74
8875 C 1977 14.77 8.36
8875 D 1977 15.94 9.53
V 75 1974 9.71 3.30
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 06/20/1988
Station ID: 8538875 SUPERCEDED DATE: 04/21/2003
Name: POMPESTON CREEK, DELAWARE RIVER
NEW JERSEY
NOAA Chart: 12314 Latitude: 40° 0.8' N
USGS Quad: FRANK FORD Longitude: 75° 0.5' 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.