U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 06/27/1988
Station ID: 8531712 SUPERCEDED DATE: 04/21/2003
Name: HIGHLANDS BRIDGE, SHREWSBURY RIVER
NEW JERSEY
NOAA Chart: 12326 Latitude: 40° 23.8' N
USGS Quad: SANDY HOOK Longitude: 73° 58.9' W
To reach the tidal bench marks from the east end of the State Highway 36 bridge
over the Shrewsbury River, proceed east on East View Hill Road down to the
waterfront and South Bay Avenue, then 0.1 mile (0.2 km) north on South Bay
Avenue to the Texaco Gas Wharf. The bench marks are in the vicinity of Highway
Route 36 Bridge and its intersection with South Bay Avenue. The tide gage and
staff were on the south of a T-shaped pier, just west of the north-south section
of the pier next to a bait shack.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1712 A 1976
MONUMENTATION: Survey Disk VM#: 2557
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is located on the west shore of the Shrewsbury River 450 feet
(137 m) north of where State Highway 36 bridge passes over South Bay Avenue,
82.8 feet (25.2 m) NW of the NW corner of a one-story frame building, 66.2 feet
(20.2 m) west of the west curb of Bay Avenue, 3.1 feet (0.9 m) SW of the chain
link fence corner, and 2.7 feet (0.8 m) east of a wood utility pole. The bench
mark is set 0.2 foot (0.1 m) below ground level, crimped to a copper-clad steel
rod driven 31 feet (9 m) to refusal, and encased in a PVC pipe and concrete.
BENCH MARK STAMPING: NO 6 1934
MONUMENTATION: Survey Disk VM#: 2556
AGENCY: PID#: KU0845
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument at a point where South
Bay Street goes under State Highway 36 bridge over the Shrewsbury River, 63.5
feet (19.4 m) west of powerline pole #40051HB, 10.7 feet (3.3 m) west of the
west curb of South Bay Street, 5.7 feet (1.7 m) south of the SE corner of the
north bridge pier, and 0.5 foot (0.2 m) below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 06/27/1988
Station ID: 8531712 SUPERCEDED DATE: 04/21/2003
Name: HIGHLANDS BRIDGE, SHREWSBURY RIVER
NEW JERSEY
NOAA Chart: 12326 Latitude: 40° 23.8' N
USGS Quad: SANDY HOOK Longitude: 73° 58.9' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1712 B 1976
MONUMENTATION: Survey Disk VM#: 2558
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is located on the west shore of the Shrewsbury River 150 feet (46
m) south of where South Bay Street passes under State Highway 36 bridge, 98.2
feet (29.6 m) SE of the SE corner of a small brick pumping station, 85.7 feet
(26.1 m) east of the east curb of South Bay Avenue, 37.1 feet (11.3 m) NW of the
NE corner at the beginning of a timber bulkhead, and 4 feet (1 m) west of the
top of the slope along the shore. The bench mark is set 0.2 foot (0.1 m) below
ground level, crimped to a copper-clad steel rod driven 38 feet (12 m) to
refusal, and encased inside a PVC pipe and concrete.
BENCH MARK STAMPING: 6267
MONUMENTATION: Survey Disk VM#: 2559
AGENCY: PID#: KU0846
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set on the top of a concrete monument at the west end of State
Highway 36 bridge, 29 feet (9 m) south of the centerline of Highway 36, 27.9
feet (8.5 m) WNW of the west end of the bridge, 6.6 feet (2.0 m) south of the
south curb, and 4 feet (1 m) north of the west end of the guard rail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 06/27/1988
Station ID: 8531712 SUPERCEDED DATE: 04/21/2003
Name: HIGHLANDS BRIDGE, SHREWSBURY RIVER
NEW JERSEY
NOAA Chart: 12326 Latitude: 40° 23.8' N
USGS Quad: SANDY HOOK Longitude: 73° 58.9' W
T I D A L D A T U M S
Tidal datums at HIGHLANDS BRIDGE, SHREWSBURY RIVER based on:
LENGTH OF SERIES: 8 MONTHS
TIME PERIOD: MARCH - NOVEMBER 1976
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8531680 SANDY HOOK
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (03/16/1976) = 7.17
MEAN HIGHER HIGH WATER MHHW = 4.68
MEAN HIGH WATER MHW = 4.36
MEAN TIDE LEVEL MTL = 2.27
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 1.58
MEAN LOW WATER MLW = 0.17
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (03/17/1976) = -1.94
* NGVD reference based on adjustment of 1967 and NOS levels of 1976.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
1712 A 1976 14.00 9.64
NO 6 1934 14.30 9.94
1712 B 1976 8.94 4.58
6267 46.84 42.48
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 06/27/1988
Station ID: 8531712 SUPERCEDED DATE: 04/21/2003
Name: HIGHLANDS BRIDGE, SHREWSBURY RIVER
NEW JERSEY
NOAA Chart: 12326 Latitude: 40° 23.8' N
USGS Quad: SANDY HOOK Longitude: 73° 58.9' 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.