U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8534778 PUBLICATION DATE: 03/16/2010
Name: STEELMANVILLE, PATCONG RIVER
NJ
NOAA Chart: 12316 Latitude: 39° 20.1' N ( 39.33500)
USGS Quad: OCEAN CITY Longitude: 74° 35.8' W ( -74.59670)
To reach the tidal bench marks from the intersection of Bethel Road and U.S.
Highway 9 in Steelmanville, proceed 0.5 km (0.3 mi) north on Bethel Road to its
intersection with Ocean Heights Avenue, then proceed 0.2 km (0.1 mi) NW along
the driveway entrance to Windmere Apartments. The bench marks are located along
Ocean Heights Avenue and the driveway entrance to the apartments. The tide gage
and staff were located on a privately owned pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4778 A 1977
DESIGNATION: 853 4778 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 2729
AGENCY: National Ocean Survey (NOS) IDB PID#: AM6966
SETTING CLASSIFICATION: Copper clad steel rod OPUS PID:
LATITUDE: 39° 20.1' N ( 39.33500) LONGITUDE: 74° 35.8' W ( -74.59670)
The primary bench mark is a disk located 52.94 m (173.7 ft) east of the wooden
bulkhead of Patcong Creek, 8.47 m (27.8 ft) SE of the SW corner of the 3-story
wood Windmere Apartments building, 7.35 m (24.1 ft) SW of the SE corner of the
building, and 5.33 m (17.5 ft) NE of a 4 m (14 ft) gas lamppost. 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), 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 6
Station ID: 8534778 PUBLICATION DATE: 03/16/2010
Name: STEELMANVILLE, PATCONG RIVER
NJ
NOAA Chart: 12316 Latitude: 39° 20.1' N ( 39.33500)
USGS Quad: OCEAN CITY Longitude: 74° 35.8' W ( -74.59670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4778 B 1977
DESIGNATION: 853 4778 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 2730
AGENCY: National Ocean Survey (NOS) IDB PID#: AM6967
SETTING CLASSIFICATION: Copper clad steel rod OPUS PID:
LATITUDE: 39° 20.1' N ( 39.33500) LONGITUDE: 74° 35.8' W ( -74.59670)
The bench mark is a disk located 76 m (250 ft) east of bench mark 4778 A 1977,
61.11 m (200.5 ft) SE of the NE corner of Windmere Apartments building, 8.69 m
(28.5 ft) NW of wood utility pole #860, 3 m (10 ft) SW of the centerline of the
driveway leading to Windmere Apartments, and 0.88 m (2.9 ft) NE of the steel
fence bordering the south side of the driveway. 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), and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 4778 C 1977
DESIGNATION: 853 4778 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 2731
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper clad steel rod OPUS PID:
LATITUDE: 39° 20.1' N ( 39.33500) LONGITUDE: 74° 35.8' W ( -74.59670)
The bench mark is a disk located near the north edge of the lawn of the United
Methodist Church between Ocean Heights Avenue and Bethel Road, 133.7 m (438.5
ft) SE of bench mark 4778 B 1977, 17.22 m (56.5 ft) west of the NW corner of a
2-story house at 585 Ocean Heights Avenue, 13.78 m (45.2 ft) NE of wood utility
pole #BT 460 SP, and 9.81 m (32.2 ft) east of the centerline of Bethel Road.
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), 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 6
Station ID: 8534778 PUBLICATION DATE: 03/16/2010
Name: STEELMANVILLE, PATCONG RIVER
NJ
NOAA Chart: 12316 Latitude: 39° 20.1' N ( 39.33500)
USGS Quad: OCEAN CITY Longitude: 74° 35.8' W ( -74.59670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4778 D 1977
DESIGNATION: 853 4778 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 2732
AGENCY: National Ocean Survey (NOS) IDB PID#: AM6968
SETTING CLASSIFICATION: Bridge abutment OPUS PID:
LATITUDE: 39° 20.1' N ( 39.33500) LONGITUDE: 74° 35.8' W ( -74.59670)
The bench mark is a disk set on the top of the SE bridge abutment wall at the
Ocean Heights Avenue bridge, 0.24 km (0.15 mi) NW of bench mark 4778 C 1977,
22.71 m (74.5 ft) NW of the SE end of a steel guard rail, 9.05 m (29.7 ft) NE of
the SW face of the bridge, 6 m (20 ft) SW of wood utility pole #BT36, 2 m (7 ft)
NW of the end of the abutment, 0.67 m (2.2 ft) south of a square Atlantic City
Electric wood utility pole, and 1 m (2 ft) above the level of the bridge.
BENCH MARK STAMPING: 4778 E 1977
DESIGNATION: 853 4778 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 2733
AGENCY: National Ocean Survey (NOS) IDB PID#: AM6969
SETTING CLASSIFICATION: Bridge abutment OPUS PID:
LATITUDE: 39° 20.1' N ( 39.33500) LONGITUDE: 74° 35.8' W ( -74.59670)
The bench mark is a disk set on the top of the NW bridge abutment wall at the
Ocean Heights Avenue bridge, 82.75 m (271.5 ft) NW of bench mark 4778 D 1977,
22.59 m (74.1 ft) SE of the NW end of a steel guard rail, 9.05 m (29.7 ft) SW of
the NE face of the bridge, and 2.01 m (6.6 ft) SE of the NW end of the abutment.
The bench mark is 6 cm (0.2 ft) above the level of the bridge pavement.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8534778 PUBLICATION DATE: 03/16/2010
Name: STEELMANVILLE, PATCONG RIVER
NJ
NOAA Chart: 12316 Latitude: 39° 20.1' N ( 39.33500)
USGS Quad: OCEAN CITY Longitude: 74° 35.8' W ( -74.59670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: G 65 1964
DESIGNATION: G 65
MONUMENTATION: Bench Mark disk VM#: 2734
AGENCY: US Coast & Geodetic Survey
(USC&GS) IDB PID#: JU0358
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 39° 19.7' N ( 39.32830) LONGITUDE: 74° 35.1' W ( -74.58500)
The bench mark is a disk set in the top of a concrete post flush with the
ground, located 2.01 km (1.25 mi) NE along Shore Road from the city hall at
Somers Point in the village of Linwood, near the intersection of Shore Road and
Ocean Heights Avenue, 25 m (82 ft) NNW of the center of the intersection, 19 m
(61 ft) NW of the NW curb of Shore Road, 5 m (18 ft) NE of the centerline of the
avenue, and 0.91 m (3.0 ft) NW of utility pole #P17846.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8534778 PUBLICATION DATE: 03/16/2010
Name: STEELMANVILLE, PATCONG RIVER
NJ
NOAA Chart: 12316 Latitude: 39° 20.1' N ( 39.33500)
USGS Quad: OCEAN CITY Longitude: 74° 35.8' W ( -74.59670)
T I D A L D A T U M S
Tidal datums at STEELMANVILLE, PATCONG RIVER based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: August 1977 - July 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8557380 LEWES, FT. MILES
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.284
MEAN HIGH WATER MHW = 1.176
MEAN SEA LEVEL MSL = 0.636
MEAN TIDE LEVEL MTL = 0.612
MEAN LOW WATER MLW = 0.049
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4778 A 1977 3.803 2.627
4778 B 1977 4.091 2.915
4778 C 1977 3.812 2.636
4778 D 1977 4.683 3.507
4778 E 1977 4.247 3.071
G 65 1964 8.301 7.125
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8534778 PUBLICATION DATE: 03/16/2010
Name: STEELMANVILLE, PATCONG RIVER
NJ
NOAA Chart: 12316 Latitude: 39° 20.1' N ( 39.33500)
USGS Quad: OCEAN CITY Longitude: 74° 35.8' W ( -74.59670)
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.