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National Ocean Service
Datums Page Page 1 of 5
Station ID: 8510448 PUBLICATION DATE: 04/21/2003
Name: U.S. COAST GUARD STATION, LAKE MONTAUK
NY
NOAA Chart: 13209 Latitude: 41° 4.4' N ( 41.07330)
USGS Quad: MONTAUK POINT Longitude: 71° 56.1' W ( -71.93500)
From the intersection of State Highway 27 and West Lake Drive (County Hwy 77) on
the east side of the village of Montauk, proceed north on West Lake Drive for
about 2.4 km (1.5 mi), then turn right and continue east onto Star Island and
follow the signs for the US Coast Guard Station at the north end of the island.
The bench marks are on the Coast Guard station grounds. The tide gage was
located at the NW end of the Coast Guard boat dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 6 1974
DESIGNATION: 851 0448 NO 6
MONUMENTATION: Tidal Station disk VM#: 14818
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 41° 4.3' N ( 41.07170) LONGITUDE: 71° 56.0' W ( -71.93330)
The primary bench mark is a disk set flush in the SE corner of the concrete
foundation of the southernmost garage door, at the SE corner of the Coast Guard
station at Lake Montauk, 27.74 m (91.0 ft) west of the parking lot entrance,
15.54 m (51.0 ft) north of the south edge of the parking lot, and 0.15 m (0.5
ft) south of the garage door.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8510448 PUBLICATION DATE: 04/21/2003
Name: U.S. COAST GUARD STATION, LAKE MONTAUK
NY
NOAA Chart: 13209 Latitude: 41° 4.4' N ( 41.07330)
USGS Quad: MONTAUK POINT Longitude: 71° 56.1' W ( -71.93500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 851 0448 TIDAL 2
ALIAS: NO 2 1973
MONUMENTATION: Not specified (see descriptive text) VM#: 14819
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete post OPUS PID:
LATITUDE: 41° 4.3' N ( 41.07170) LONGITUDE: 71° 56.0' W ( -71.93330)
The bench mark is the stem of a former disk set in the top of a 6 in X 6 in
concrete post near the entrance to the USGC Station parking lot, 24.02 m (78.8
ft) south of the SE corner of the USCG communications room, 19.81 m (65.0 ft) SE
of the main entrance to the USCG station, 17.98 m (59.0 ft) east of the SE
corner of the garage, and flush with the ground. NOTE: the original disk has
been removed.
BENCH MARK STAMPING: 0448 A 1998
DESIGNATION: 851 0448 A
MONUMENTATION: Flange-encased Rod VM#: 14820
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBDB80
LATITUDE: 41° 4.2' N ( 41.07000) LONGITUDE: 71° 56.2' W ( -71.93670)
The bench mark is a flange-encased rod located near the SW corner of the USCG
Station and an east-west fence, 27.01 m (88.6 ft) SW of the SW corner of the UPH
barracks, 19.69 m (64.6 ft) east of the west end of a chainlink fence, 1.15 m
(3.8 ft) north of the fence. The datum point is the top of a stainless steel rod
driven 6.1 m (20 ft) to refusal, encased in a sleeve to a depth of 1 m (3 ft)
and with a 5 inch NOS logo cap at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8510448 PUBLICATION DATE: 04/21/2003
Name: U.S. COAST GUARD STATION, LAKE MONTAUK
NY
NOAA Chart: 13209 Latitude: 41° 4.4' N ( 41.07330)
USGS Quad: MONTAUK POINT Longitude: 71° 56.1' W ( -71.93500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0448 B 1998
DESIGNATION: 851 0448 B
MONUMENTATION: Tidal Station disk VM#: 14821
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 41° 4.2' N ( 41.07000) LONGITUDE: 71° 56.0' W ( -71.93330)
The bench mark is a disk set flush at the NW corner of a concrete foundation of
a diesel storage tank, at the NE side of the USCG Station, 25.35 m (83.2 ft)
east of a flagpole, 20.84 m (68.4 ft) SE from the shore end of the pier, 24.60 m
(80.7 ft) NE of the NE corner of the Administration Building, and 7.41 m (24.3
ft) WSW of a chainlink fence.
BENCH MARK STAMPING: 0448 C 1998
DESIGNATION: 851 0448 C
MONUMENTATION: Tidal Station disk VM#: 14822
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete landing OPUS PID:
LATITUDE: 41° 4.3' N ( 41.07170) LONGITUDE: 71° 56.0' W ( -71.93330)
The bench mark is a disk set flush in the south corner of the concrete landing
behind the garage building of the USCG Station, 17.75 m (58.2 ft) north of the
east-west fence line, 14.11 m (46.3 ft) east of the SE corner of the Barrarks
Building, and 1.37 m (4.5 ft) south of the south side of the garage building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8510448 PUBLICATION DATE: 04/21/2003
Name: U.S. COAST GUARD STATION, LAKE MONTAUK
NY
NOAA Chart: 13209 Latitude: 41° 4.4' N ( 41.07330)
USGS Quad: MONTAUK POINT Longitude: 71° 56.1' W ( -71.93500)
T I D A L D A T U M S
Tidal datums at U.S. COAST GUARD STATION, LAKE MONTAUK based on:
LENGTH OF SERIES: 10 Months
TIME PERIOD: October 1998 - July 1999
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8510560 MONTAUK, FORT POND BAY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.750
MEAN HIGH WATER MHW = 0.663
MEAN TIDE LEVEL MTL = 0.358
MEAN SEA LEVEL MSL = 0.357
MEAN LOW WATER MLW = 0.052
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 6 1974 3.029 2.366
851 0448 TIDAL 2 2.466 1.803
0448 A 1998 2.562 1.899
0448 B 1998 2.436 1.773
0448 C 1998 3.039 2.376
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8510448 PUBLICATION DATE: 04/21/2003
Name: U.S. COAST GUARD STATION, LAKE MONTAUK
NY
NOAA Chart: 13209 Latitude: 41° 4.4' N ( 41.07330)
USGS Quad: MONTAUK POINT Longitude: 71° 56.1' W ( -71.93500)
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.