U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8516155 PUBLICATION DATE: 04/29/2014
Name: GREEN ISLAND DRAWBRIDGE
NY
NOAA Chart: 12352a Latitude: 40° 37.4' N ( 40.62330)
USGS Quad: JONES INLET Longitude: 73° 30.1' W ( -73.50170)
From the intersection of State Highways 27 (Sunrise Highway) and 908T (Wantagh
Parkway) in Wantagh, proceed south on Route 908T for 6.3 km (3.9 mi) to the
Green Island fishing pier access road, turn right and continue south for 0.4 km
(0.2 mi) on the access road to the parking area. The bench marks are located
between the north end of the parking area and the SE side of the bridge. The
tide gauge is located on a concrete abutment to a preexisting bridge at the end
of the wooden fishing pier on the east side of the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6155 A 2013
DESIGNATION: 851 6155 A
MONUMENTATION: Flange-encased Rod VM#: 20971
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Stainless stee rod with sleeve OPUS PID#: BBDJ58
LATITUDE: 40° 37.0' N ( 40.61658) LONGITUDE: 73° 30.2' W ( -73.50344)
The primary bench mark is a flange encased rod set just NW of the gravel parking
area for the Green Island fishing pier, 70.14 m (230.1 ft) NW of a handicapped
parking sign, 44.21 m (145.0 ft) W of the centerline of a gravel access road,
and 0.66 m (2.2 ft) S of a witness post. The datum point is set 8 cm (0.3 ft)
below grade, being the top of a stainless steel rod driven 23.2 m (76.0 ft) to
refusal, in a sleeve extending to a depth of 1.1 m (3.6 ft) and encased in a
7-inch national ocean service logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8516155 PUBLICATION DATE: 04/29/2014
Name: GREEN ISLAND DRAWBRIDGE
NY
NOAA Chart: 12352a Latitude: 40° 37.4' N ( 40.62330)
USGS Quad: JONES INLET Longitude: 73° 30.1' W ( -73.50170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6155 B 2013
DESIGNATION: 851 6155 B
MONUMENTATION: Bench Mark disk VM#: 20972
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Massive retaining wall OPUS PID:
LATITUDE: 40° 36.9' N ( 40.61517) LONGITUDE: 73° 30.1' W ( -73.50175)
The bench mark is a disk set in the NW wing wall of the Jones Beach Causeway
bridge, 13.15 m (43.1 ft) (slope) ENE of the NE corner of a concrete mat with a
park bench, 11.83 m (38.8 ft) NW of where the wing wall meets the abutment, 4.82
m (15.8 ft) SW of the southbound Jones Beach Causeway guardrail, 3.41 m (11.2
ft) S of the SW corner of the southbound draw bridge traffic light pole, 0.41 m
(1.3 ft) SE of the NW corner of the bridge wing wall, and 0.19 m (0.6 ft) above
the pavement.
BENCH MARK STAMPING: 6155 C 2013
DESIGNATION: 851 6155 C
MONUMENTATION: Bench Mark disk VM#: 20973
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Abutment of a large bridge OPUS PID:
LATITUDE: 40° 36.9' N ( 40.61564) LONGITUDE: 73° 30.1' W ( -73.50133)
The bench mark is a disk set in an abutment for a removed bridge just NE of the
Jones Beach Causeway bridge, 13.18 m (43.2 ft) NNE of an inside corner of the
sheet pile wall, 11.86 m (38.9 ft) NNE of the SW corner of the abutment, 9.55 m
(31.3 ft) SSW of the W support post for a yellow sign warning of a submerged
high voltage cable, 3.53 m (11.6 ft) NW of the SE outside corner of the sheet
pile wall and 2.45 m (8.0 ft) higher than the pedestrian pathway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8516155 PUBLICATION DATE: 04/29/2014
Name: GREEN ISLAND DRAWBRIDGE
NY
NOAA Chart: 12352a Latitude: 40° 37.4' N ( 40.62330)
USGS Quad: JONES INLET Longitude: 73° 30.1' W ( -73.50170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6155 D 2013
DESIGNATION: 851 6155 D
MONUMENTATION: Bench Mark disk VM#: 20974
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Massive retaining wall OPUS PID:
LATITUDE: 40° 36.8' N ( 40.61333) LONGITUDE: 73° 30.0' W ( -73.50031)
The bench mark is a disk set in the SW wing wall of the Jones Beach Causeway
bridge, 7.72 m (25.3 ft) S of the SE corner of an aluminum mechanical box for
the bridge gate, 6.60 m (21.7 ft) WNW of a wooden utility light pole, 4.70 m
(15.4 ft) WSW of the S Jones Beach Causeway guardrail, 0.76 m (2.5 ft) NW of the
bridge wing wall s corner and 0.44 m (1.4 ft) above the pavement.
BENCH MARK STAMPING: 6155 E 2013
DESIGNATION: 851 6155 E
MONUMENTATION: Bench Mark disk VM#: 20975
AGENCY: National Ocean Service IDB PID#:
SETTING CLASSIFICATION: Abutment of a large bridge OPUS PID:
LATITUDE: 40° 36.8' N ( 40.61308) LONGITUDE: 73° 31.0' W ( -73.51600)
The bench mark is a disk set in an abutment for a removed bridge just SE of the
Jones Beach Causeway bridge, 11.83 m (38.8 ft) ENE of the SW corner of the
bridge abutment, 11.41 m (37.4 ft) WNW of the NW support post for a yellow sign
warning of a submerged high voltage cable, 5.15 m (16.9 ft) SSE of the NE
outside corner of the sheet pile wall, 0.39 m (1.3 ft) NNW of the S edge of the
abutment, 3.65 m (12.0 ft) above the beach, and 0.25 m (0.82 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8516155 PUBLICATION DATE: 04/29/2014
Name: GREEN ISLAND DRAWBRIDGE
NY
NOAA Chart: 12352a Latitude: 40° 37.4' N ( 40.62330)
USGS Quad: JONES INLET Longitude: 73° 30.1' W ( -73.50170)
T I D A L D A T U M S
Tidal datums at GREEN ISLAND DRAWBRIDGE based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: January 2014 - February 2014
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8531680 SANDY HOOK
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.073
MEAN HIGH WATER MHW = 0.998
MEAN SEA LEVEL MSL = 0.537
MEAN TIDE LEVEL MTL = 0.525
MEAN LOW WATER MLW = 0.051
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6155 A 2013 1.986 0.988
6155 B 2013 7.588 6.590
6155 C 2013 5.286 4.288
6155 D 2013 7.144 6.146
6155 E 2013 5.273 4.274
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8516155 PUBLICATION DATE: 04/29/2014
Name: GREEN ISLAND DRAWBRIDGE
NY
NOAA Chart: 12352a Latitude: 40° 37.4' N ( 40.62330)
USGS Quad: JONES INLET Longitude: 73° 30.1' W ( -73.50170)
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.