U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
PUBLICATION DATE: 11/19/1991
Station ID: 8513388 SUPERCEDED DATE: 04/21/2003
Name: MORICHES COAST GUARD STATION, MORICHES BAY
NEW YORK
NOAA Chart: 12353 Latitude: 40° 47.2' N
USGS Quad: MORICHES Longitude: 72° 45.0' W
To reach the tidal bench marks from the intersection of Montauk Highway (Rt. 80)
and Atlantic Avenue in East Moriches, proceed south on Atlantic Avenue for 0.8
mile (1.3 km), then turn left onto Moriches Island Road and go east and south
for 0.9 mile (1.4 km) to U.S. Coast Guard Group Moriches. The bench marks
are on the station grounds and along Moriches Island Road. The tide gage and
staff were on the station boat basin bulkhead.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 3388 A 1989
MONUMENTATION: Survey Disk VM#: 4845
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Block
The primary bench mark is set flush in a concrete manhole block west of the west
face of the main building at the Coast Guard station, 65.0 feet (19.8 m) east of
the station flagstaff, 55.3 feet (16.9 m) SW of the SW corner of the boathouse,
and 41.6 feet (12.7 m) NW of the SW corner of the main building.
BENCH MARK STAMPING: 3388 B 1989
MONUMENTATION: Survey Disk VM#: 4846
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Box
The bench mark is set flush in a concrete electric box on the north side of the
Coast Guard station, 92.7 feet (28.3 m) NE of the NE corner of the boat basin,
81 feet (25 m) NW of the NE corner of the boathouse, and 75 feet (23 m) north of
the NW corner of the boathouse.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
PUBLICATION DATE: 11/19/1991
Station ID: 8513388 SUPERCEDED DATE: 04/21/2003
Name: MORICHES COAST GUARD STATION, MORICHES BAY
NEW YORK
NOAA Chart: 12353 Latitude: 40° 47.2' N
USGS Quad: MORICHES Longitude: 72° 45.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3388 C 1989
MONUMENTATION: Survey Disk VM#: 4847
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Pad
The bench mark is set flush in a concrete pad at the Coast Guard station, near
the SE corner of a building with four garage doors on its south side, 3.1 feet
(0.9 m) SW of the SE corner of the building, 2.5 feet (0.8 m) west of the
extension of the east side of the building, and 1.4 feet (0.4 m) south of the
south face of the building.
BENCH MARK STAMPING: 3388 D 1989
MONUMENTATION: Survey Disk VM#: 4848
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is set along the south side of an 8-foot (2 m) high chain link
fence near the entrance to the coast guard station, 132 feet (40 m) NW of the
most northerly of two antennas, 33.3 feet (10.1 m) east of the east gate post of
the entrance, and 3.2 feet (1.0 m) west of the post at the angle point of the
fence east of the gate post. The bench mark is 0.2 foot (0.1 m) below ground
level, crimped to a stainless steel rod driven 92 feet (28 m) to substantial
resistance, and encased in a 5-foot (2 m) long section of 5-inch PVC pipe driven
into the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
PUBLICATION DATE: 11/19/1991
Station ID: 8513388 SUPERCEDED DATE: 04/21/2003
Name: MORICHES COAST GUARD STATION, MORICHES BAY
NEW YORK
NOAA Chart: 12353 Latitude: 40° 47.2' N
USGS Quad: MORICHES Longitude: 72° 45.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: COAST MORICHES SET 1989
MONUMENTATION: Survey Disk VM#: 4849
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Box
The bench mark is set flush in the SW corner of a square concrete manhole box SE
of the SE building in the SE corner of the Coast Guard station grounds, 73.9
feet (22.5 m) SW of the SE corner of the building, 72.6 feet (22.1 m) SE of the
SW corner, and 57.0 feet (17.4 m) south of the centerline of the lowest step at
the entrance to the building.
BENCH MARK STAMPING: 2-975
MONUMENTATION: Survey Disk VM#: 4850
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is 0.2 mile (0.3 km) south along Atlantic Avenue from its
intersection with Montauk Highway in East Moriches, at the intersection of Maple
and Atlantic Avenues, 79.1 feet (24.1 m) east of the SE corner of a one and a
half story frame house, 57.8 feet (17.6 m) SW of a 1.8-foot (0.5 m) diameter
maple tree, 48.9 feet (14.9 m) SSW of power pole #10-5 J, 36.0 feet (11.0 m) WNW
of power pole #11 J, and 3.1 feet (0.9 m) SSE of a 0.8-foot (0.2 m) diameter
maple tree.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
PUBLICATION DATE: 11/19/1991
Station ID: 8513388 SUPERCEDED DATE: 04/21/2003
Name: MORICHES COAST GUARD STATION, MORICHES BAY
NEW YORK
NOAA Chart: 12353 Latitude: 40° 47.2' N
USGS Quad: MORICHES Longitude: 72° 45.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2-976
MONUMENTATION: Survey Disk VM#: 4851
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a concrete monument, 0.5 mile (0.8 km) south along
Atlantic Avenue from its intersection with Montauk Highway, on the east side of
Atlantic Avenue, 131.2 feet (40.0 m) NW of a reference pole, 119.2 feet (36.3 m)
SE of power pole #21, 78.6 feet (24.0 m) NE of the NE corner of a two-story
frame house, 44.9 feet ( 13.7 m) ENE of a 2.5-foot (0.8 m) diameter maple tree,
and 1.7 feet (0.5 m) NW of power pole #22.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
PUBLICATION DATE: 11/19/1991
Station ID: 8513388 SUPERCEDED DATE: 04/21/2003
Name: MORICHES COAST GUARD STATION, MORICHES BAY
NEW YORK
NOAA Chart: 12353 Latitude: 40° 47.2' N
USGS Quad: MORICHES Longitude: 72° 45.0' W
T I D A L D A T U M S
Tidal datums at MORICHES COAST GUARD STATION, MORICHES BAY based on:
LENGTH OF SERIES: 12 MONTHS
TIME PERIOD: AUGUST 1989-JULY1990
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8461490 NEW LONDON
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (11/16/1989) = 4.11
MEAN HIGHER HIGH WATER MHHW = 2.51
MEAN HIGH WATER MHW = 2.28
MEAN TIDE LEVEL MTL = 1.20
MEAN LOW WATER MLW = 0.12
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (11/21/1989) = -1.10
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
3388 A 1989 7.49 5.21
3388 B 1989 5.94 3.66
3388 C 1989 9.81 7.53
3388 D 1989 6.66 4.38
COAST MORICHES SET 1989 8.33 6.05
2-975 23.03 20.75
2-976 11.88 9.60
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
PUBLICATION DATE: 11/19/1991
Station ID: 8513388 SUPERCEDED DATE: 04/21/2003
Name: MORICHES COAST GUARD STATION, MORICHES BAY
NEW YORK
NOAA Chart: 12353 Latitude: 40° 47.2' N
USGS Quad: MORICHES Longitude: 72° 45.0' 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.