U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 02/12/1985
Station ID: 8534638 SUPERCEDED DATE: 04/21/2003
Name: ABSECON CHANNEL @ STATE ROUTE 87
NEW JERSEY
NOAA Chart: 12316 Latitude: 39° 23.1' N
USGS Quad: OCEANVILLE Longitude: 74° 25.5' W
To reach the tidal bench marks from the U-turn ramp under the south end of the
new Brigantine Boulevard bridge (State Route 87) over Absecon Channel at
Atlantic City, proceed 0.1 mile (0.2 km) NE along Old Brigantine Boulevard to
the abandoned bridge abutment of the former Brigantine Boulevard bridge. The
bench marks are located along Old Brigantine Boulevard. The tide gage and staff
were located on the Brigantine Bridge Marine pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4638 A 1977
MONUMENTATION: Survey Disk VM#: 2705
AGENCY: PID#: JU4082
SETTING CLASSIFICATION: Concrete Abutment
The bench mark is set on the top of the SW abandoned bridge abutment of the
former Brigantine Boulevard bridge, 32.5 feet (9.9 m) east of a wooden utility
pole, 18.4 feet (5.6 m) SE of the wooden bulkhead angle point, 17.5 feet (5.3 m)
SE of the south end of the steel guard rail, 16.4 feet (5.0 m) NW of the
centerline of Old Brigantine Boulevard, and 1 foot (0.3 m) above the level of
the former bridge pavement.
BENCH MARK STAMPING: 4638 B 1977
MONUMENTATION: Survey Disk VM#: 2706
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is 571 feet (174 m) SW of Bench Mark 4638 A 1977, 44.1 feet (13.4
m) SW of the intersection of centerline of Old Brigantine Boulevard and the
U-turn ramp, 42.9 feet (13.1 m) NW of wood utility pole #A 17913, 27.7 feet (8.4
m) SE of a fire hydrant, 11.4 feet (3.5 m) south of wood utility pole #2556, and
5.7 feet (1.7 m) west of the west curb of the U-turn ramp. The bench mark is
0.2 foot (0.1 m) below ground level, crimped to a galvanized steel rod driven 50
feet (15 m), 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
PUBLICATION DATE: 02/12/1985
Station ID: 8534638 SUPERCEDED DATE: 04/21/2003
Name: ABSECON CHANNEL @ STATE ROUTE 87
NEW JERSEY
NOAA Chart: 12316 Latitude: 39° 23.1' N
USGS Quad: OCEANVILLE Longitude: 74° 25.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4638 C 1977
MONUMENTATION: Survey Disk VM#: 2707
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is 582.6 feet (177.6 m) SW of Bench Mark 4638 B 1977, 79.9 feet
(24.4 m) SW of the SW corner of a 2-story wood and cement block building #1625,
57.6 feet (17.6 m) SW of wood utility pole #BT 4345, 49.8 feet (15.2 m) NW of
wood utility pole #2551, 40.6 feet (12.4 m) SE of wood utility pole #A 17892,
and 24.0 feet (7.3 m) NW of the centerline of the Old Brigantine Boulevard. The
bench mark is 0.2 foot (0.6 m) below ground level, crimped to a galvanized steel
rod driven 50 feet (15 m), and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 4638 D 1977
MONUMENTATION: Survey Disk VM#: 2708
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is 0.15 mile (0.24 km) south of Bench Mark ATLANTIC 1932 1973,
65.7 feet (20.0 m) NE of a steel traffic sign with the words DO NOT ENTER, 62.0
feet (18.9 m) SW of wood utility pole #2542, 21.9 feet (6.7 m) south of the
north end of the SE curb, and 7.8 feet (2.4 m) SE of the SE curb of Old
Brigantine Boulevard. The bench mark is 0.2 foot (0.6 m) below ground level,
crimped to a galvanized steel rod driven 50 feet (15 m), 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: 02/12/1985
Station ID: 8534638 SUPERCEDED DATE: 04/21/2003
Name: ABSECON CHANNEL @ STATE ROUTE 87
NEW JERSEY
NOAA Chart: 12316 Latitude: 39° 23.1' N
USGS Quad: OCEANVILLE Longitude: 74° 25.5' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: ATLANTIC 1932 1973
MONUMENTATION: Survey Disk VM#: 2709
AGENCY: PID#: JU2792
SETTING CLASSIFICATION: Concrete Post
The bench mark is set on the top of a concrete post, 490 feet (149 m) SW of
Bench Mark 4638 C 1977, 136.5 feet (41.6 m) SW of Bench Mark ATLANTIC NO 1 1932,
29 feet (9 m) NW of the centerline of Old Brigantine Boulevard, 16.0 feet (4.9
m) north of wood utility pole #A 14816, 4.0 feet (1.2 m) SW of the steel guide
wire post supporting the wood utility pole, and 2.4 feet (0.7 m) NE of a witness
post.
BENCH MARK STAMPING: ATLANTIC NO 1 1932
MONUMENTATION: Survey Disk VM#: 2710
AGENCY: PID#: AE4636
SETTING CLASSIFICATION: Unknown
The bench mark is 136.5 feet (41.6 m) NE of Bench Mark ATLANTIC 1932 1973 on the
east side of Old Brigantine Boulevard just north of a telephone pole, and 9.3
feet (2.8 m) east of the east side of the road.
BENCH MARK STAMPING: ATLANTIC NO 4 1973
MONUMENTATION: Survey Disk VM#: 2711
AGENCY: PID#: JU4079
SETTING CLASSIFICATION: Concrete Post
The bench mark is set in the top of a 0.8 foot (0.2 m) diameter concrete post,
25 feet (7.6 m) SE of the centerline of Old Brigantine Boulevard, and 2.0 feet
(0.6 m) SW of power line pole ACE 2544.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 02/12/1985
Station ID: 8534638 SUPERCEDED DATE: 04/21/2003
Name: ABSECON CHANNEL @ STATE ROUTE 87
NEW JERSEY
NOAA Chart: 12316 Latitude: 39° 23.1' N
USGS Quad: OCEANVILLE Longitude: 74° 25.5' W
T I D A L D A T U M S
Tidal datums at ABSECON CHANNEL @ STATE ROUTE 87 based on:
LENGTH OF SERIES: 12 MONTHS
TIME PERIOD: JUNE 1977 - MAY 1978
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8557380 LEWES, DE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (10/14/1977) = 7.61
MEAN HIGHER HIGH WATER MHHW = 4.46
MEAN HIGH WATER MHW = 4.08
MEAN TIDE LEVEL MTL = 2.13
MEAN LOW WATER MLW = 0.18
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (12/10/1977) = -2.29
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
4638 A 1977 12.04 7.96
4638 B 1977 9.04 4.96
4638 C 1977 9.28 5.20
4638 D 1977 9.29 5.21
ATLANTIC 1932 1973 9.14 5.06
ATLANTIC NO 1 1932 8.90 4.82
ATLANTIC NO 4 1973 8.59 4.51
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 02/12/1985
Station ID: 8534638 SUPERCEDED DATE: 04/21/2003
Name: ABSECON CHANNEL @ STATE ROUTE 87
NEW JERSEY
NOAA Chart: 12316 Latitude: 39° 23.1' N
USGS Quad: OCEANVILLE Longitude: 74° 25.5' 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.