U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 07/20/1987
Station ID: 8512354 SUPERCEDED DATE: 04/21/2003
Name: SHINNECOCK INLET, ATLANTIC OCEAN
NEW YORK
NOAA Chart: 12353 Latitude: 40° 50.2' N
USGS Quad: SHINNECOCK INLET Longitude: 72° 28.8' W
To reach the tidal bench marks from the Hampton Bays Post Office, proceed SE on
Ponquogue Bridge Road for 3.5 miles (5.6 m) to Dune Road, turn left on Dune Road
and proceed east for 1.1 miles (1.8 km) to its end. The bench marks are located
along Dune Road. The tide gage and staff were located on a piling 125 feet (38
m) west of the western jetty and 200 feet (61 m) south of the approximate low
water line of the beach.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 2354 A 1977
MONUMENTATION: Survey Disk VM#: 7405
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Steel Rod
The bench mark is 164.5 feet (50.1 m) south of the centerline of Dune Road at
the end, 154.6 feet (47.1 m) SW of a red beacon light, 140.6 feet (42.9 m) south
of utility pole #46, and 33.9 feet (10.3 m) SE of the Bench Mark No 1 1974. The
bench mark is crimped to a unspecified steel rod driven 50 feet (15 m),
encased in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: NO 1 1974
MONUMENTATION: Survey Disk VM#: 7400
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush in a concrete slab beneath an observation tower
close to the inlet, 210 feet (64 m) SE of the SW corner of Shinnecock Bait and
Tackle Snack Bar, 130 feet (40 m) SE of the intersection of Dune Road and the
parking lot entrance, and 5 feet (2 m) NE of the NW corner of the observation
tower leg.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 07/20/1987
Station ID: 8512354 SUPERCEDED DATE: 04/21/2003
Name: SHINNECOCK INLET, ATLANTIC OCEAN
NEW YORK
NOAA Chart: 12353 Latitude: 40° 50.2' N
USGS Quad: SHINNECOCK INLET Longitude: 72° 28.8' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1974
MONUMENTATION: Survey Disk VM#: 7401
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set in the concrete slab foundation of the stairway entrance
to Shinnecock Bait and Tackle Snack Bar, 200 feet (61 m) NW of the Coast Guard
light, 75 feet (23 m) north of the centerline of Dune Road, 30 feet (9 m) east
of the centerline of the parking lot entrace next to the snack bar, and 3 feet
(1 m) south of the door to the restaurant.
BENCH MARK STAMPING: NO 3 1974
MONUMENTATION: Survey Disk VM#: 7402
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush in the SW corner of a concrete fuel tank cover
located in the Deck Restaurant parking lot, 99.5 feet (30.3 m) SW of the NW
corner of a wooden porch on the Deck Restaurant, 72.3 feet (22.0 m) north of the
centerline of Dune Road, 53.9 feet (16.4 m) west of a P.K. nail set on top of a
wooden post near the SW corner of the Deck Restaurant at the beginning of a line
of wooden guard rail posts, and 42.4 feet (12.9 m) NW of a P.K. nail set on the
top of a wooden post at the end of the line of wooden guard rail posts.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 07/20/1987
Station ID: 8512354 SUPERCEDED DATE: 04/21/2003
Name: SHINNECOCK INLET, ATLANTIC OCEAN
NEW YORK
NOAA Chart: 12353 Latitude: 40° 50.2' N
USGS Quad: SHINNECOCK INLET Longitude: 72° 28.8' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2354 B 1977
MONUMENTATION: Survey Disk VM#: 7406
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Steel Rod
The bench mark is 132.2 feet (40.3 m) SE of the SW corner of the Shinnecock Bait
and Tackle Snack Bar, 119.2 feet (36.3 m) SE of a P.K. nail set 5 feet (2 m)
up a utility pole, 115.6 feet (35.2 m) south of the SE corner of the Shinnecock
Bait and Tackle Snack Bar and the easterly building line extended, 64.4 feet
(19.6 m) south of the centerline of Dune Road, and 45.2 feet (13.8 m) SW of
a P.K. nail set 5 feet (2 m) up utility pole #45. The bench mark is crimped to
an unspecified steel rod driven 50 feet (15 m), encased in a 4-inch PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: 2354 C 1977
MONUMENTATION: Survey Disk VM#: 7407
AGENCY: PID:
SETTING CLASSIFICATION: Unspecified Steel Rod
The bench mark is 135.6 feet (41.3 m) SE of a P.K. nail set 4 feet (1 m) up
utility pole #41, 100.6 feet (30.7 m) SW of a P.K. nail set 4 feet (1 m) up
utility pole #43, 50.7 feet (15.5 m) south of the centerline of Dune Road, and
28.4 feet (8.7 m) south of a P.K. nail set 3 feet (1 m) up utility pole #42.
The bench mark is crimped to an unspecified steel rod driven 50 feet (15 m) to
refusal, encased in 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 07/20/1987
Station ID: 8512354 SUPERCEDED DATE: 04/21/2003
Name: SHINNECOCK INLET, ATLANTIC OCEAN
NEW YORK
NOAA Chart: 12353 Latitude: 40° 50.2' N
USGS Quad: SHINNECOCK INLET Longitude: 72° 28.8' W
T I D A L D A T U M S
Tidal datums at SHINNECOCK INLET, ATLANTIC OCEAN based on:
LENGTH OF SERIES: 12 MONTHS
TIME PERIOD: JUNE 1978-MAY 1979
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8518750 THE BATTERY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (12/25/1978) = 7.17
MEAN HIGHER HIGH WATER MHHW = 3.78
MEAN HIGH WATER MHW = 3.49
MEAN TIDE LEVEL MTL = 1.83
MEAN LOW WATER MLW = 0.16
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (03/28/1979) = -1.67
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
2354 A 1977 15.38 11.89
NO 1 1974 14.80 11.31
NO 2 1974 7.08 3.59
NO 3 1974 9.52 6.03
2354 B 1977 7.83 4.34
2354 C 1977 7.71 4.22
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 07/20/1987
Station ID: 8512354 SUPERCEDED DATE: 04/21/2003
Name: SHINNECOCK INLET, ATLANTIC OCEAN
NEW YORK
NOAA Chart: 12353 Latitude: 40° 50.2' N
USGS Quad: SHINNECOCK INLET Longitude: 72° 28.8' 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.