U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8539487 PUBLICATION DATE: 04/13/2005
Name: FIELDSBORO, DELAWARE RIVER
NJ
NOAA Chart: 12314 Latitude: 40° 8.2' N ( 40.13670)
USGS Quad: TRENTON EAST Longitude: 74° 44.2' W ( -74.73670)
To reach the tidal bench marks from the intersection of 4th Street and U.S.
Highway 130 in the village of Fieldsboro, proceed 0.8 km (0.5 mi) NE on 4th
Street to the entrance of the Steppan Chemical Company, then proceed 0.5 km (0.3
mi) NW on the entrance road to the east bank of Delaware River. The bench marks
are located on the grounds of the Steppan Chemical Company. The tide gage and
staff were located on the company pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9487 A 1977
DESIGNATION: 853 9487 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 2890
AGENCY: National Ocean Survey (NOS) IDB PID#: KV5987
SETTING CLASSIFICATION: Concrete footing OPUS PID#: KV5987
LATITUDE: 40° 8.1' N ( 40.13500) LONGITUDE: 74° 44.2' W ( -74.73670)
The primary bench mark is a disk set in the NE corner of a concrete footing,
28.71 m (94.2 ft) east of the SW corner of a steel chain link fence bordering
the river, 26.46 m (86.8 ft) SW of the south end of a propane gas storage tank,
19.26 m (63.2 ft) NW of the SW corner of the brick building, and 14.36 m (47.1
ft) west of the NW corner of a one-story brick storage building. NOTE: A 5 m
(16 ft) tank has been erected less than 1 meter south of the station.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8539487 PUBLICATION DATE: 04/13/2005
Name: FIELDSBORO, DELAWARE RIVER
NJ
NOAA Chart: 12314 Latitude: 40° 8.2' N ( 40.13670)
USGS Quad: TRENTON EAST Longitude: 74° 44.2' W ( -74.73670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9487 B 1977
DESIGNATION: 853 9487 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 2891
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete footing OPUS PID:
LATITUDE: 40° 8.2' N ( 40.13670) LONGITUDE: 74° 44.2' W ( -74.73670)
The bench mark is a disk set in the concrete footing at the base of the SW leg
support of the tower, 15.85 m (52.0 ft) NW of the westernmost rail of the Penn
Central railroad tracks, 12.31 m (40.4 ft) east of a cylindrical chemical
storage tank, 6.13 m (20.1 ft) north of the NW corner of a 2-story sheet metal
building, and 0.30 m (1.0 ft) above ground level. NOTE: This mark is sinking.
Do not use.
BENCH MARK STAMPING: 9487 C 1977
DESIGNATION: 853 9487 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 2892
AGENCY: National Ocean Survey (NOS) IDB PID#: KV5988
SETTING CLASSIFICATION: Copper clad steel rod OPUS PID:
LATITUDE: 40° 8.1' N ( 40.13500) LONGITUDE: 74° 43.2' W ( -74.72000)
The bench mark is a disk located 9.69 m (31.8 ft) NW of the east rail of the
railroad tracks, 8.47 m (27.8 ft) south of the wood utility pole #435 on the
east side of the entrance road, and 3.96 m (13.0 ft) SW of the south face of the
overhead steel walkway over the railroad tracks. The bench mark is set 6 cm
(0.2 ft) below ground level, crimped to the top of a copper-clad steel rod
driven 15.2 m (50 ft) 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
Station ID: 8539487 PUBLICATION DATE: 04/13/2005
Name: FIELDSBORO, DELAWARE RIVER
NJ
NOAA Chart: 12314 Latitude: 40° 8.2' N ( 40.13670)
USGS Quad: TRENTON EAST Longitude: 74° 44.2' W ( -74.73670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9487 D 1977
DESIGNATION: 853 9487 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 2893
AGENCY: National Ocean Survey (NOS) IDB PID#: KV5989
SETTING CLASSIFICATION: Copper clad steel rod OPUS PID:
LATITUDE: 40° 8.0' N ( 40.13330) LONGITUDE: 74° 43.1' W ( -74.71830)
The bench mark is a disk located 13.26 m (43.5 ft) SW of the SE corner of the
main office building, 11.98 m (39.3 ft) south of the SW corner of the main
office building, 10.00 m (32.8 ft) west of the flagpole next to the main office
building, and 4.24 m (13.9 ft) SE of the SW corner of the chain link fence
surrounding the lawn. The bench mark is set 6 cm (0.2 ft) below ground level,
crimped to the top of a copper-clad steel rod driven 15.2 m (50 ft) to refusal,
and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 9487 E 1977
DESIGNATION: 853 9487 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 2894
AGENCY: National Ocean Survey (NOS) IDB PID#: KV5990
SETTING CLASSIFICATION: Copper clad steel rod OPUS PID:
LATITUDE: 40° 8.0' N ( 40.13330) LONGITUDE: 74° 43.1' W ( -74.71830)
The bench mark is a disk located 21.61 m (70.9 ft) north of the NE corner of the
truck scale, 19.78 m (64.9 ft) NE of the SE corner of the one-story gate house,
12.80 m (42.0 ft) SE of a chain link fence, and 5.12 m (16.8 ft) south of a
wooden utility pole #60104 F.B. The bench mark is set 6 cm (0.2 ft) below
ground level, crimped to the top of a copper-clad steel rod driven 12.2 m (40
ft) 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
Station ID: 8539487 PUBLICATION DATE: 04/13/2005
Name: FIELDSBORO, DELAWARE RIVER
NJ
NOAA Chart: 12314 Latitude: 40° 8.2' N ( 40.13670)
USGS Quad: TRENTON EAST Longitude: 74° 44.2' W ( -74.73670)
T I D A L D A T U M S
Tidal datums at FIELDSBORO, DELAWARE RIVER based on:
LENGTH OF SERIES: 10 MONTHS
TIME PERIOD: April 1977 - January 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8545530 PHILADELPHIA (PIER 11 NORTH), DEL. RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 2.581
MEAN HIGH WATER MHW = 2.470
MEAN SEA LEVEL MSL = 1.291
MEAN TIDE LEVEL MTL = 1.266
North American Vertical Datum NAVD88 = 1.140
MEAN LOW WATER MLW = 0.061
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9487 A 1977 4.229 1.759
9487 B 1977 4.459 1.989
9487 C 1977 4.259 1.789
9487 D 1977 11.689 9.219
9487 E 1977 16.180 13.710
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8539487 PUBLICATION DATE: 04/13/2005
Name: FIELDSBORO, DELAWARE RIVER
NJ
NOAA Chart: 12314 Latitude: 40° 8.2' N ( 40.13670)
USGS Quad: TRENTON EAST Longitude: 74° 44.2' W ( -74.73670)
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.