U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 11/25/1991
Station ID: 8512987 SUPERCEDED DATE: 04/21/2003
Name: NORTHVILLE FUEL DOCK, LONG ISLAND SOUND
NEW YORK
NOAA Chart: 12358 Latitude: 40° 58.9' N
USGS Quad: RIVERHEAD Longitude: 72° 38.7' W
To reach the tidal bench marks from State Highway 25 in River- head, proceed
east on State Highway 25 for 1.6 miles (2.6 km) to a stoplight, turn left onto
Route 105-N and go 1,6 miles (2.6 km) to Route 43-E, turn right onto Route 43-E
and go 0.5 mile (0.8 km) to Sound Road, turn right onto Sound Road and go
0.1 mile (0.2 km) to Pennys Road, turn left onto Pennys Road and follow the
curves for 1.6 miles (2.6 km) to Northville Industries Corporations Riverhead
Terminal. The bench mark are along the beach on the north side of the property.
The tide gauge and staff were on the fuel loading pier on the north side of the
property.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2987 A 1987
MONUMENTATION: Survey Disk VM#: 7409
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Support
The primary mark is set flush on the first concrete cell from the shore on the
fuel loading pier, 13.0 feet (4.0 m) NW of the NW corner of a wood-framed safety
shack, 6.7 feet (2.0 m) south of the western bollard on the cell, and 1.5 feet
(0.5 m) east of the west face of the cell.
BENCH MARK STAMPING: NO 3 1969
MONUMENTATION: Survey Disk VM#: 7408
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Pipeline
The bench mark is set flush in the top of the westernmost concrete pipeline on
the beach just east of the fuel loading pier, 152.0 feet (46.3 m) west of the
angle at the NE corner of the bulkhead, 3.0 feet (0.9 m) north of the steel
sheet pile bulkhead, 0.5 foot (0.2 m) east of the west face of the westernmost
of two concrete pipelines that lead onto the beach from beneath the bulkhead, 5
feet (2 m) below the top of the bulkhead, and 3 feet (1 m) above the beach.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 11/25/1991
Station ID: 8512987 SUPERCEDED DATE: 04/21/2003
Name: NORTHVILLE FUEL DOCK, LONG ISLAND SOUND
NEW YORK
NOAA Chart: 12358 Latitude: 40° 58.9' N
USGS Quad: RIVERHEAD Longitude: 72° 38.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2987 B 1987
MONUMENTATION: Survey Disk VM#: 7410
AGENCY: PID:
SETTING CLASSIFICATION: Large Concrete Pad
The bench mark is set flush in the concrete pad at the foot of the fuel loading
pier, 44.8 feet (13.7 m) south of the south end of the steel pier, 33.0 feet
(10.1 m) north of a wood retaining wall at the foot of a hill, 10.7 feet (3.3 m)
SW of the SW corner of a 10 x 8-foot (3 x 2 m) concrete building at the base of
the pier, 1.7 feet (0.5 m) east of a 1-foot (0.3 m) diameter gas pipeline
running along the west side of the pier, and 2.5 feet (0.8 m) feet below the
road level.
BENCH MARK STAMPING: 2987 C 1987
MONUMENTATION: Survey Disk VM#: 7411
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Pad
The bench mark is set flush in a concrete pad at the base of the steps over the
pipeline at the pipeline switching station and beach pump house, 101.0 feet
(30.8 m) west of the angle at the NE corner of bulkhead, 35.5 feet (10.8 m)
north of the NW corner of green aluminum framed beach pump house, and 17.7 feet
(5.4 m) south of the concrete cap of the bulkhead along the beach.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 11/25/1991
Station ID: 8512987 SUPERCEDED DATE: 04/21/2003
Name: NORTHVILLE FUEL DOCK, LONG ISLAND SOUND
NEW YORK
NOAA Chart: 12358 Latitude: 40° 58.9' N
USGS Quad: RIVERHEAD Longitude: 72° 38.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2987 D 1987
MONUMENTATION: Survey Disk VM#: 7412
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush in the concrete foundation of a pipleline support at
the pipeline switching station and beach pump house, 30.2 feet (9.2 m) north of
the NE corner of the green aluminum framed beach pump house, 26.2 feet (8.0 m)
SW of the angle at the NE corner of bulkhead, and just beneath the most NE bend
of the gas pipeline.
BENCH MARK STAMPING: 2987 E 1987
MONUMENTATION: Survey Disk VM#: 7413
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Curb
The bench mark is set flush in the top of a concrete retaining curb at the
pipeline switching station and beach pump house, 40.0 feet (12.2 m) NE of a
light/power pole, 24.6 feet (7.5 m) north of the north end of a chain fence
along the road leading up the hill to offices, 21.5 feet (6.6 m) south of the SW
corner of the extended section of the green aluminum framed beach pump house.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 11/25/1991
Station ID: 8512987 SUPERCEDED DATE: 04/21/2003
Name: NORTHVILLE FUEL DOCK, LONG ISLAND SOUND
NEW YORK
NOAA Chart: 12358 Latitude: 40° 58.9' N
USGS Quad: RIVERHEAD Longitude: 72° 38.7' W
T I D A L D A T U M S
Tidal datums at NORTHVILLE FUEL DOCK, LONG ISLAND SOUND based on:
LENGTH OF SERIES: 10 MONTHS
TIME PERIOD: APRIL 1988 TO JANUARY 1989
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8514560 PORT JEFFERSON
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (10/22/1988) = 8.99
MEAN HIGHER HIGH WATER (MHHW) = 5.95
MEAN HIGH WATER (MHW) = 5.64
MEAN TIDE LEVEL (MTL) = 2.94
MEAN LOW WATER (MLW) = 0.24
MEAN LOWER LOW WATER (MLLW) = 0.00
LOWEST OBSERVED WATER LEVEL (02/09/1989) = -1.81
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
2987 A 1987 14.08 8.44
NO 3 1969 13.04 7.40
2987 B 1987 14.78 9.14
2987 C 1987 19.93 14.29
2987 D 1987 18.93 13.29
2987 E 1987 35.22 29.58
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 11/25/1991
Station ID: 8512987 SUPERCEDED DATE: 04/21/2003
Name: NORTHVILLE FUEL DOCK, LONG ISLAND SOUND
NEW YORK
NOAA Chart: 12358 Latitude: 40° 58.9' N
USGS Quad: RIVERHEAD Longitude: 72° 38.7' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.