U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8538449 PUBLICATION DATE: 07/14/2003
Name: BRIDGEPORT, RACOON CREEK
NJ
NOAA Chart: 12312 Latitude: 39° 48.4' N ( 39.80670)
USGS Quad: BRIDGEPORT Longitude: 75° 21.3' W ( -75.35500)
To reach the tidal bench marks from the intersection of Island Road and U.S.
Highway 130 in Bridgeport, proceed north on Island Road for 0.3 km (0.2 mi) to
the third house on the west side of the road (Keen residence). The bench marks
are along Island Road, South Bridgeport Road, and Pennsylvania Reading Seashore
Lines Railroad. The tide gauge and staff were on the SW corner of a wooden dock
behind the Keen residence.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8449 A 1977
DESIGNATION: 853 8449 A
MONUMENTATION: Tidal Station disk VM#: 11476
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 39° 48.4' N ( 39.80670) LONGITUDE: 75° 21.3' W ( -75.35500)
The primary bench mark is a disk located at the Keen residence, 22.28 m (73.1
ft) west of the SE corner and 18.81 m (61.7 ft) WSW of the SW corner of the
two-story brick house, 10.73 m (35.2 ft) NW of the NW corner of a T-shaped
wooden dock, and 8 m (25 ft) north of the approximate high water line of Raccoon
Creek. The bench mark is set 6 cm (0.2 ft) below ground level, crimped to the
top of a a copper-clad steel rod driven 12.5 m (41 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 2 of 5
Station ID: 8538449 PUBLICATION DATE: 07/14/2003
Name: BRIDGEPORT, RACOON CREEK
NJ
NOAA Chart: 12312 Latitude: 39° 48.4' N ( 39.80670)
USGS Quad: BRIDGEPORT Longitude: 75° 21.3' W ( -75.35500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9.610 G 10 1930
DESIGNATION: G 10
MONUMENTATION: Bench Mark disk VM#: 11475
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: JU0663
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 39° 47.9' N ( 39.79830) LONGITUDE: 75° 21.1' W ( -75.35170)
The bench mark is a disk set in the top of the SW corner of a concrete base for
a semaphore along the Pennsylvania-Reading Seashore Lines Railroad, 36.15 m
(118.6 ft) west of the station at Bridgeport, 10.73 m (35.2 ft) south of a
packing house, and 2.04 m (6.7 ft) north of the north rail.
BENCH MARK STAMPING: 8449 B 1977
DESIGNATION: 853 8449 B
MONUMENTATION: Tidal Station disk VM#: 11477
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 39° 48.4' N ( 39.80670) LONGITUDE: 75° 21.3' W ( -75.35500)
The bench mark is a disk located about 0.2 km (0.1 mi) SE of bench mark 8449 A
1977, 17.53 m (57.5 ft) south of wood utility pole # L-3, 8.53 m (28.0 ft) east
of the centerline of Island Road, 7.07 m (23.2 ft) north of the SW corner of
House No. 11 (a two story wood building) and 1.46 m (4.8 ft) NW of the NW corner
of House No. 11. The bench mark is set 6 cm (0.2 ft) below ground level,
crimped to the top of a copper-clad steel rod driven 11.9 m (39 ft) to refusal,
and encased in PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8538449 PUBLICATION DATE: 07/14/2003
Name: BRIDGEPORT, RACOON CREEK
NJ
NOAA Chart: 12312 Latitude: 39° 48.4' N ( 39.80670)
USGS Quad: BRIDGEPORT Longitude: 75° 21.3' W ( -75.35500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8449 C 1977
DESIGNATION: 853 8449 C
MONUMENTATION: Tidal Station disk VM#: 11478
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete abutment OPUS PID:
LATITUDE: 39° 48.4' N ( 39.80670) LONGITUDE: 75° 21.3' W ( -75.35500)
The bench mark is a disk set in the top of the north concrete abutment of the US
Highway 130 bridge over Raccoon Creek, about 0.2 km (0.1 mi) SW of bench mark
8449 B 1977, 25 m (83 ft) SW of the centerline of Island Road, 4.21 m (13.8 ft)
NW of a traffic signal tower, 3.35 m (11.0 ft) NW of the north curb of the
bridge, 0.91 m (3.0 ft) west of the end of a wood and steel guard rail, and
level with the bridge walkway.
BENCH MARK STAMPING: 8449 D 1977
DESIGNATION: 853 8449 D
MONUMENTATION: Tidal Station disk VM#: 11479
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 39° 48.4' N ( 39.80670) LONGITUDE: 75° 21.3' W ( -75.35500)
The bench mark is a disk located about 0.2 km (0.1 mi) SE of bench mark 8449 C
1977, at the intersection of South Bridgeport Road and Mechanic Street, 15.64 m
(51.3 ft) south of a 24-inch diameter manhole, 9.45 m (31.0 ft) SW of a fire
hydrant, 4.11 m (13.5 ft) west of the centerline of South Bridgeport Road, 2.16
m (7.1 ft) north of a wood utility pole, and 0.91 m (3.0 ft) south of the
extended centerline of Mechanics Street. The bench mark is set 6 cm (0.2 ft)
below ground level, crimped to the top of a a copper-clad steel rod driven 12.8
m (42 ft) to refusal and encased in PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8538449 PUBLICATION DATE: 07/14/2003
Name: BRIDGEPORT, RACOON CREEK
NJ
NOAA Chart: 12312 Latitude: 39° 48.4' N ( 39.80670)
USGS Quad: BRIDGEPORT Longitude: 75° 21.3' W ( -75.35500)
T I D A L D A T U M S
Tidal datums at BRIDGEPORT, RACOON CREEK based on:
LENGTH OF SERIES: 8 MONTHS
TIME PERIOD: March 1978 - October 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 = 1.815
MEAN HIGH WATER MHW = 1.714
MEAN SEA LEVEL MSL = 0.964
MEAN TIDE LEVEL MTL = 0.888
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
8449 A 1977 2.197 0.483
9.610 G 10 1930 3.491 1.777
8449 B 1977 3.308 1.594
8449 C 1977 4.941 3.227
8449 D 1977 3.778 2.064
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8538449 PUBLICATION DATE: 07/14/2003
Name: BRIDGEPORT, RACOON CREEK
NJ
NOAA Chart: 12312 Latitude: 39° 48.4' N ( 39.80670)
USGS Quad: BRIDGEPORT Longitude: 75° 21.3' W ( -75.35500)
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.