U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 6
Station ID: 8518526 PUBLICATION DATE: 03/03/2015
Name: THROGS NECK, FORT SCHUYLER, EAST RIVER
NY
NOAA Chart: 12366 Latitude: 40° 48.3' N ( 40.80500)
USGS Quad: FLUSHING Longitude: 73° 47.7' W ( -73.79500)
To reach the station from the south end of pennyfield ave at the entrance gate
to suny maritime college in the bronx, proceed SE through the entrance gate onto
Erben avenue and continue 1.4 km (0.9 mi) on the one way perimeter roadway
clockwise around the peninsula just W of the throggs neck bridge to the large
ship dock on the left and the tide station on the dock extension. The bench
marks are along the shore seawall.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 4 1951
DESIGNATION: 851 8526 TIDAL 4
MONUMENTATION: Bench Mark disk VM#: 21053
AGENCY: US Coast and Geodetic Survey IDB PID#: KU0990
SETTING CLASSIFICATION: Concrete wall OPUS PID:
LATITUDE: 40° 48.3' N ( 40.80483) LONGITUDE: 73° 47.6' W ( -73.79389)
The primary bench mark is a disk set in the top of the concrete seawall, 39.37 m
(129.2 ft) ESE of the centerline of the dock, 24.18 m (79.3 ft) SW of the corner
of the stone wall at the NW corner of the intersection of patterson street and
shepard avenue, 6.39 m (21.0 ft) W of the SW corner of the brick electrical
building, 0.69 m (2.3 ft) NNE of the S edge of the seawall and 0.65 m (2.1 ft) E
of the steel cage around air pollution instruments.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8518526 PUBLICATION DATE: 03/03/2015
Name: THROGS NECK, FORT SCHUYLER, EAST RIVER
NY
NOAA Chart: 12366 Latitude: 40° 48.3' N ( 40.80500)
USGS Quad: FLUSHING Longitude: 73° 47.7' W ( -73.79500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 5 1951
DESIGNATION: 851 8526 TIDAL 5
MONUMENTATION: Bench Mark disk VM#: 21052
AGENCY: US Coast and Geodetic Survey IDB PID#: KU0992
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 40° 48.3' N ( 40.80517) LONGITUDE: 73° 47.7' W ( -73.79436)
The bench mark is a disk set in the top of the concrete seawall at the base of
the W side of the dock, 23.57 m (77.3 ft) NE of the S end of the seawall, 4.27 m
(14.0 ft) E of the center of the tree growing on the sand beach, 4.20 m (13.8
ft) NW of a fire hydrant, 2.68 m (8.8 ft) WNW of light post 30 and 2.52 m (8.3
ftSSW of the seawall along the perimeter road.
BENCH MARK STAMPING: 8526 A 2014
DESIGNATION: 851 8526 A
MONUMENTATION: Flange-encased Rod VM#: 21054
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBDM27
LATITUDE: 40° 48.4' N ( 40.80608) LONGITUDE: 73° 47.7' W ( -73.79550)
The bench mark is a flange encased rod set in the grass seaward of the perimeter
road and walking path, 51.30 m (168.3 ft) ESE of the entrance stairs to mcmurray
hall, 23.72 m (77.8 ft) NW of the W end of the concrete post railing on top of
the seawall, 16.16 m (53.0 ft) SSE of a large bollard adjacent to an electric
manhole, 10.74 m (35.2 ft) WSW of the centerline of the perimeter road, 4.88 m
(16.0 ft) S of a lamp post and 4.16 m (13.6 ft) NNE of the seaward side of the
stone seawall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8518526 PUBLICATION DATE: 03/03/2015
Name: THROGS NECK, FORT SCHUYLER, EAST RIVER
NY
NOAA Chart: 12366 Latitude: 40° 48.3' N ( 40.80500)
USGS Quad: FLUSHING Longitude: 73° 47.7' W ( -73.79500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1951
DESIGNATION: 851 8526 TIDAL 2
MONUMENTATION: Bench Mark disk VM#: 21055
AGENCY: US Coast and Geodetic Survey IDB PID#: KU0987
SETTING CLASSIFICATION: Sidewalk OPUS PID:
LATITUDE: 40° 48.3' N ( 40.80481) LONGITUDE: 73° 47.6' W ( -73.79361)
The bench mark is a disk set in the sidewalk, 65.56 m (215.1 ft), SE of the SE
corner of the brick electrical building, 19.55 m (64.1 ft) S of the corner of
the stone wall at the NW corner of the intersection, 18.54 m (60.8 ft) W of the
NE corner of the bridge abutment, 16.32 m (53.5 ft) SW of the corner of the
stone wall at the northeast corner of The intersection and 8.80 m (28.9 ft) S of
the center of the intersection between Shepard avenue and Patterson street.
BENCH MARK STAMPING: NO 3 1951
DESIGNATION: 851 8526 TIDAL 3
ALIAS:
MONUMENTATION: Bench Mark disk VM#: 21056
AGENCY: US Coast and Geodetic Survey IDB PID#: KU0986
SETTING CLASSIFICATION: Sidewalk OPUS PID:
LATITUDE: 40° 48.3' N ( 40.80447) LONGITUDE: 73° 47.6' W ( -73.79289)
The bench mark is a disk set in the sidewalk on top of the stone seawall, 65.56
m (215.1 ft), 46.71 m (153.2 ft) ESE of the NE corner of the Throggs Neck bridge
abutment, 10.85 m (35.6 ft) S of the tree in the grass S of the perimeter road,
3.99 m (13.1 ft) WNW of the bottom of the steps leading to the power house and
0.50 m (1.6 ft) NNE of the seaward edge of the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8518526 PUBLICATION DATE: 03/03/2015
Name: THROGS NECK, FORT SCHUYLER, EAST RIVER
NY
NOAA Chart: 12366 Latitude: 40° 48.3' N ( 40.80500)
USGS Quad: FLUSHING Longitude: 73° 47.7' W ( -73.79500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: A 340 1952
DESIGNATION: A 340 USLHS
MONUMENTATION: Bench Mark disk VM#: 21057
AGENCY: Unknown IDB PID#: KU0984
SETTING CLASSIFICATION: Top of a concrete monument OPUS PID:
LATITUDE: 40° 48.3' N ( 40.80481) LONGITUDE: 73° 47.5' W ( -73.79103)
The bench mark is a disk set in the top of a concrete monument on the SE side of
Fort Schuyler, 42.96 m (140.9 ft) NNE of a small mounted cannon, 31.11 m (102.1
ft) SW of a fire hydrant, 21.94 m (72.0 ft) W of the W most corner of the white
house across the road, 18.64 m (61.2 ft) SE of the stone fort, 7.48 m (24.5 ft)
NW of the centerline of the perimeter road, 4.70 m (15.4 ft) NE of a 0.9 m (3.0
ft) diameter sycamore tree and 0.40 m (1.3 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8518526 PUBLICATION DATE: 03/03/2015
Name: THROGS NECK, FORT SCHUYLER, EAST RIVER
NY
NOAA Chart: 12366 Latitude: 40° 48.3' N ( 40.80500)
USGS Quad: FLUSHING Longitude: 73° 47.7' W ( -73.79500)
T I D A L D A T U M S
Tidal datums at THROGS NECK, FORT SCHUYLER, EAST RIVER based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: May 2014 - July 2014
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8516945 KINGS POINT, LONG ISLAND SOUND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 2.367
MEAN HIGH WATER MHW = 2.257
North American Vertical Datum NAVD88 = 1.244
MEAN SEA LEVEL MSL = 1.188
MEAN TIDE LEVEL MTL = 1.170
MEAN LOW WATER MLW = 0.084
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 4 1951 4.766 2.509
NO 5 1951 4.756 2.499
8526 A 2014 4.746 2.489
NO 2 1951 4.755 2.498
NO 3 1951 4.774 2.517
A 340 1952 5.978 3.721
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8518526 PUBLICATION DATE: 03/03/2015
Name: THROGS NECK, FORT SCHUYLER, EAST RIVER
NY
NOAA Chart: 12366 Latitude: 40° 48.3' N ( 40.80500)
USGS Quad: FLUSHING Longitude: 73° 47.7' W ( -73.79500)
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.