U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8513388 PUBLICATION DATE: 05/22/2013
Name: MORICHES COAST GUARD STATION, MORICHES B
NY
NOAA Chart: 12353 Latitude: 40° 47.2' N ( 40.78670)
USGS Quad: MORICHES Longitude: 72° 45.0' W ( -72.75000)
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 1.3
km (0.8 mi), then turn left onto Moriches Island Road and go east and south for
1.4 km (0.9 mi) 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
DESIGNATION: 851 3388 A 1989
MONUMENTATION: Survey disk VM#: 4845
AGENCY: National Ocean Survey/Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete block OPUS PID:
LATITUDE: 40° 47.3' N ( 40.78756) LONGITUDE: 72° 45.0' W ( -72.75003)
The primary bench mark is a disk set flush in a concrete manhole block west of
the west face of the main building at the Coast Guard station, 19.81 m (65.0 ft)
east of the station flagstaff, 16.86 m (55.3 ft) SW of the SW corner of the
boathouse, and 12.68 m (41.6 ft) NW of the SW corner of the main building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8513388 PUBLICATION DATE: 05/22/2013
Name: MORICHES COAST GUARD STATION, MORICHES B
NY
NOAA Chart: 12353 Latitude: 40° 47.2' N ( 40.78670)
USGS Quad: MORICHES Longitude: 72° 45.0' W ( -72.75000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3388 B 1989
DESIGNATION: 851 3388 B 1989
MONUMENTATION: Survey disk VM#: 4846
AGENCY: National Ocean Survey/Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete box OPUS PID:
LATITUDE: 40° 47.2' N ( 40.78669) LONGITUDE: 72° 45.0' W ( -72.75000)
The bench mark is a disk set flush in a concrete electric box on the north side
of the Coast Guard station, 28.25 m (92.7 ft) NE of the NE corner of the boat
basin, 25 m (81 ft) NW of the NE corner of the boathouse, and 23 m (75 ft) north
of the NW corner of the boathouse.
BENCH MARK STAMPING: 3388 C 1989
DESIGNATION: 851 3388 C 1989
MONUMENTATION: Survey disk VM#: 4847
AGENCY: National Ocean Survey/Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 40° 47.3' N ( 40.78811) LONGITUDE: 72° 45.0' W ( -72.74967)
The bench mark is a disk 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, 0.94
m (3.1 ft) SW of the SE corner of the building, 0.76 m (2.5 ft) west of the
extension of the east side of the building, and 0.43 m (1.4 ft) south of the
south face of the building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8513388 PUBLICATION DATE: 05/22/2013
Name: MORICHES COAST GUARD STATION, MORICHES B
NY
NOAA Chart: 12353 Latitude: 40° 47.2' N ( 40.78670)
USGS Quad: MORICHES Longitude: 72° 45.0' W ( -72.75000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3388 D 1989
DESIGNATION: 851 3388 D 1989
MONUMENTATION: Survey disk VM#: 4848
AGENCY: National Ocean Survey/Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 40° 47.4' N ( 40.78969) LONGITUDE: 72° 44.7' W ( -72.74578)
The bench mark is a disk crimped to a stainless steel rod, set along the south
side of an 2 m (8 ft) high chain link fence near the entrance to the coast guard
station, 40 m (132 ft) NW of the most northerly of two antennas, 10.15 m (33.3
ft) east of the east gate post of the entrance, and 0.98 m (3.2 ft) west of the
post at the angle point of the fence east of the gate post. The bench mark is
0.06 m (0.2 ft) below ground level, crimped to a stainless steel rod driven 28 m
(92 ft) to substantial resistance, and encased in a 2 m (5 ft) long section of
5-inch PVC pipe driven into the ground.
BENCH MARK STAMPING: COAST MORICHES SET 1989
DESIGNATION: 851 3388 COAST MORICHES
MONUMENTATION: Survey disk VM#: 4849
AGENCY: National Ocean Survey/Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete box OPUS PID:
LATITUDE: 40° 47.3' N ( 40.78861) LONGITUDE: 72° 44.7' W ( -72.74469)
The bench mark is a disk 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,
22.52 m (73.9 ft) SW of the SE corner of the building, 22.13 m (72.6 ft) SE of
the SW corner, and 17.37 m (57.0 ft) south of the centerline of the lowest step
at the entrance to the building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8513388 PUBLICATION DATE: 05/22/2013
Name: MORICHES COAST GUARD STATION, MORICHES B
NY
NOAA Chart: 12353 Latitude: 40° 47.2' N ( 40.78670)
USGS Quad: MORICHES Longitude: 72° 45.0' W ( -72.75000)
T I D A L D A T U M S
Tidal datums at MORICHES COAST GUARD STATION, MORICHES B based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: August 1989 - July 1990
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:
HIGHEST OBSERVED WATER LEVEL (11/16/1989) = 1.200
MEAN HIGHER HIGH WATER MHHW = 0.761
MEAN HIGH WATER MHW = 0.691
MEAN TIDE LEVEL MTL = 0.364
MEAN SEA LEVEL MSL = 0.361
MEAN LOW WATER MLW = 0.036
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (11/21/1989) = -0.388
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
3388 A 1989 2.230 1.539
3388 B 1989 1.759 1.068
3388 C 1989 2.937 2.246
3388 D 1989 1.978 1.287
COAST MORICHES SET 1989 2.485 1.794
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8513388 PUBLICATION DATE: 05/22/2013
Name: MORICHES COAST GUARD STATION, MORICHES B
NY
NOAA Chart: 12353 Latitude: 40° 47.2' N ( 40.78670)
USGS Quad: MORICHES Longitude: 72° 45.0' W ( -72.75000)
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.