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Datums Page Page 1 of 9
Station ID: 8519050 PUBLICATION DATE: 12/12/2014
Name: USCG STATION NY, THE NARROWS
NY
NOAA Chart: 12334 Latitude: 40° 36.7' N ( 40.61200)
USGS Quad: THE NARROWS Longitude: 74° 3.6' W ( -74.05986)
To reach the tide station from the toll plaza at the west end of the
verrazano-narrows bridge, proceed west 0.1 km (0.1 mi) to the exit on the right
for bay street, proceed 0.2 km (0.1 mi) west on the exit ramp and then continue
along the curve to the right onto school road and proceed 0.4 km (0.25 mi) ne on
school road to bay street, turn left and proceed 0.4 km (0.25 mi) nw on bay
street to anchor place, turn right and proceed east 0.2 km (0.1 mi) on anchor
place through the us coast guard station new york gate to search lane, turn
right onto search lane and proceed east 0.15 km (0.1 mi) down the hill to the
boat basin and the tide station on the walkway around the boat basin. The bench
marks are on the grounds of the us coast guard station, along bay street and in
the vicinity of fort wadsworth which is 0.9 km (0.6 mi) se of the tide station.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9050 C 2014
DESIGNATION: 851 9050 C
MONUMENTATION: Flange-encased Rod VM#: 21069
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBDM39
LATITUDE: 40° 36.8' N ( 40.61272) LONGITUDE: 74° 3.7' W ( -74.06108)
The bench mark is a flange encased rod set in the grass near the edge of the
bluff overlooking the boat basin, 57.50 m (188.6 ft) N of the flagpole in front
of the brick residence, 12.48 m (40.9 ft) ESE of the gate in the fence along the
N side of the coast guard station, 11.96 m (39.2 ft) NE of an unused flagpole,
6.58 m (21.6 ft) NNW of the concrete post at the NE corner of the picnic shelter
and 1.85 m (6.1 ft) W of the edge of the grass bluff.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 9
Station ID: 8519050 PUBLICATION DATE: 12/12/2014
Name: USCG STATION NY, THE NARROWS
NY
NOAA Chart: 12334 Latitude: 40° 36.7' N ( 40.61200)
USGS Quad: THE NARROWS Longitude: 74° 3.6' W ( -74.05986)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 22 BOR
DESIGNATION: 22 BOR
MONUMENTATION: Chiseled Square VM#: 21070
AGENCY: Unknown IDB PID#: KV0408
SETTING CLASSIFICATION: Concrete step OPUS PID:
LATITUDE: 40° 36.6' N ( 40.61019) LONGITUDE: 74° 3.8' W ( -74.06339)
The bench mark is a 5 cm (2 inch) by 7 cm (3 inches) chiseled rectangle in a
concrete step in a doorway at 1377 bay street, 23.77 m (78.0 ft) S of the N end
of the building at an alleyway, 12.05 m (39.5 ft) N of a power pole tagged
31004, 6.79 m (22.3 ft) N of the S end of the building, 3.80 m (12.5 ft) E of a
square gas valve cover in the sidewalk, and 21 cm (8 inches) above the sidewalk.
BENCH MARK STAMPING: 9024 B 1980
DESIGNATION: 851 9024 B
MONUMENTATION: Bench Mark disk VM#: 21071
AGENCY: National Ocean Survey IDB PID#:
SETTING CLASSIFICATION: Exposed concrete foundation OPUS PID:
LATITUDE: 40° 36.3' N ( 40.60556) LONGITUDE: 74° 3.3' W ( -74.05461)
The bench mark is a disk in the exposed concrete foundation adjacent to battery
weed, 58.44 m (191.7 ft) S of of the N corner of battery weed, 30.40 m (99.7 ft)
N of bench mark tidal 5 station I 36 a, 14.88 m (48.8 ft) NW of the center of
the entrance gate, 8.48 m (27.8 ft) W of the W wall of battery weed, and 0.32 m
(1.0 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 9
Station ID: 8519050 PUBLICATION DATE: 12/12/2014
Name: USCG STATION NY, THE NARROWS
NY
NOAA Chart: 12334 Latitude: 40° 36.7' N ( 40.61200)
USGS Quad: THE NARROWS Longitude: 74° 3.6' W ( -74.05986)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9050 D 2014
DESIGNATION: 851 9050 D
MONUMENTATION: Bench Mark disk VM#: 21072
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Concrete still OPUS PID:
LATITUDE: 40° 36.7' N ( 40.61178) LONGITUDE: 74° 3.7' W ( -74.06236)
The bench mark is a disk set at the W end of the concrete sill of the W garage
door, 35.58 m (116.7 ft) NW of a fire hydrant, 15.62 m (51.2 ft) ENE of a
concrete wall on the W side of the parking lot, 8.14 m (26.7 ft) WSW of the
center of the man door entrance to the building, 3.41 m (11.2 ft) NNW of a
square storm drain and 1.68 m (5.5 ft) ENE of the SW corner of the building.
BENCH MARK STAMPING: 9050 A 2014
DESIGNATION: 851 9050 A
MONUMENTATION: Bench Mark disk VM#: 21073
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Low concrete wall OPUS PID:
LATITUDE: 40° 36.7' N ( 40.61192) LONGITUDE: 74° 3.6' W ( -74.06039)
The bench mark is a disk set in a low concrete wall at the SW corner of the boat
basin, 24.71 m (81.1 ft) SE of a fire hydrant, 9.32 m (30.6 ft) NNW of the
center of the double doors in a brick building along the S edge of the property,
4.62 m (15.2 ft) E of the SE corner of a brick building overlooking the boat
basin, 3.86 m (12.7 ft) SW of the seaward edge of the bulkhead, 1.26 m (4.1 ft)
W of a light pole, and 0.16 m (0.5 ft) higher than the asphalt.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 9
Station ID: 8519050 PUBLICATION DATE: 12/12/2014
Name: USCG STATION NY, THE NARROWS
NY
NOAA Chart: 12334 Latitude: 40° 36.7' N ( 40.61200)
USGS Quad: THE NARROWS Longitude: 74° 3.6' W ( -74.05986)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9050 B 2014
DESIGNATION: 851 9050 B
MONUMENTATION: Bench Mark disk VM#: 21074
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Massive retaining wall OPUS PID:
LATITUDE: 40° 36.8' N ( 40.61289) LONGITUDE: 74° 3.6' W ( -74.06069)
The bench mark is a disk set near the N end of the concrete cap of the bulkhead,
32.01 m (105.0 ft) NNE of a light pole, 17.29 m (56.7 ft) E of the most N light
pole, 10.39 m (34.1 ft) S of a fire hydrant, 4.28 m (14.0 ft) N of the center of
a rectangular storm drain, 1.07 m (3.5 ft) W of the seaward side of the concrete
cap and 0.75 m (2.5 ft) S of the N support for the us coast guard sign.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 9
Station ID: 8519050 PUBLICATION DATE: 12/12/2014
Name: USCG STATION NY, THE NARROWS
NY
NOAA Chart: 12334 Latitude: 40° 36.7' N ( 40.61200)
USGS Quad: THE NARROWS Longitude: 74° 3.6' W ( -74.05986)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 5 1951
DESIGNATION: TIDAL 5 STA I 36 A
MONUMENTATION: Tidal Station disk VM#: 21075
AGENCY: US Coast and Geodetic Survey IDB PID#: KV0398
SETTING CLASSIFICATION: Concrete in the ground OPUS PID:
LATITUDE: 40° 36.3' N ( 40.60531) LONGITUDE: 74° 3.3' W ( -74.05464)
The bench mark is a disk set on the W side of the inner concrete ring S of the
entrance gate to Battery Weed, 27.27m (89.5 ft) SE of the SE corner of the
torpedo warehouse, 26.83m (88.0 ft) SW of the center of the entrance gate to
Battery Weed, 20.39m (66.9 ft) W of the wall of Battery Weed, 11.94m (39.2 ft) E
of the SE corner of a small cement block building, 5.08m (16.7 ft) S of the SW
corner of a concrete underground utility vault and 3.07m (10.1 ft) E of the curb
face.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 9
Station ID: 8519050 PUBLICATION DATE: 12/12/2014
Name: USCG STATION NY, THE NARROWS
NY
NOAA Chart: 12334 Latitude: 40° 36.7' N ( 40.61200)
USGS Quad: THE NARROWS Longitude: 74° 3.6' W ( -74.05986)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1951
DESIGNATION: TIDAL 4 STA I 36 A
MONUMENTATION: Tidal Station disk VM#: 21076
AGENCY: US Coast and Geodetic Survey IDB PID#: KV0402
SETTING CLASSIFICATION: Granite sea wall OPUS PID:
LATITUDE: 40° 36.4' N ( 40.60592) LONGITUDE: 74° 3.2' W ( -74.05383)
The bench mark is a disk set in stone capping the seawall at the NE corner of
battery weed, 70.19 m (230.3 ft) N of the SW point of battery weed, 6.93 m (22.7
ft) NE of the NE point of battery weed and 0.98 m (3.2 ft) SW of the seaward
edge of the stone.
BENCH MARK STAMPING: 9024 A 1980
DESIGNATION: 851 9024 A
MONUMENTATION: Bench Mark disk VM#: 21077
AGENCY: National Ocean Survey IDB PID#:
SETTING CLASSIFICATION: Concrete dock OPUS PID:
LATITUDE: 40° 36.4' N ( 40.60661) LONGITUDE: 74° 3.3' W ( -74.05519)
The bench mark is a disk set in the concrete deck of torpedo wharf, 13.66 m
(44.8 ft) NNE of the base of the concrete dock, 12.85 m (42.2 ft) WNW of the
steel bollard at the SE edge of the dock, 1.41 m (4.6 ft) SSW of the broken end
of the dock and 0.36 m (1.2 ft) ESE of the E rail of the railroad tracks.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 9
Station ID: 8519050 PUBLICATION DATE: 12/12/2014
Name: USCG STATION NY, THE NARROWS
NY
NOAA Chart: 12334 Latitude: 40° 36.7' N ( 40.61200)
USGS Quad: THE NARROWS Longitude: 74° 3.6' W ( -74.05986)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1951
DESIGNATION: TIDAL 2 STA I 36 A
MONUMENTATION: Tidal Station disk VM#: 21078
AGENCY: US Coast and Geodetic Survey IDB PID#: KV0406
SETTING CLASSIFICATION: Sea wall OPUS PID:
LATITUDE: 40° 36.4' N ( 40.60647) LONGITUDE: 74° 3.3' W ( -74.05581)
The bench mark is a disk set in the top of the SW end of a concrete seawall,
40.94 m (134.3 ft) W of the W side of the base of torpedo wharf, 16.50 m (54.1
ft) NW of a the NE corner of a low brick foundation at the top of the beach, and
7.46 m (24.5 ft) WSW of the NE corner of a concrete square structure in the
middle of the beach, and 1.5 m (4.9 ft) above the beach.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 9
Station ID: 8519050 PUBLICATION DATE: 12/12/2014
Name: USCG STATION NY, THE NARROWS
NY
NOAA Chart: 12334 Latitude: 40° 36.7' N ( 40.61200)
USGS Quad: THE NARROWS Longitude: 74° 3.6' W ( -74.05986)
T I D A L D A T U M S
Tidal datums at USCG STATION NY, THE NARROWS based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: May 2014 - July 2014
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8518750 THE BATTERY, NEW YORK HARBOR
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.519
MEAN HIGH WATER MHW = 1.423
North American Vertical Datum NAVD88 = 0.826
MEAN SEA LEVEL MSL = 0.766
MEAN TIDE LEVEL MTL = 0.742
MEAN LOW WATER MLW = 0.061
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9050 C 2014 12.626 11.203
22 BOR 11.803 10.380
9024 B 1980 4.165 2.742
9050 D 2014 5.781 4.358
9050 A 2014 3.849 2.426
9050 B 2014 3.087 1.664
NO 5 1951 4.207 2.784
NO 4 1951 2.625 1.202
9024 A 1980 3.211 1.788
NO 2 1951 4.454 3.031
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 9
Station ID: 8519050 PUBLICATION DATE: 12/12/2014
Name: USCG STATION NY, THE NARROWS
NY
NOAA Chart: 12334 Latitude: 40° 36.7' N ( 40.61200)
USGS Quad: THE NARROWS Longitude: 74° 3.6' W ( -74.05986)
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.