Printable version U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 8516945 PUBLICATION DATE: 04/27/2018
Name: KINGS POINT, LONG ISLAND SOUND
NY
NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031)
USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500)
To reach the bench marks from I495 north in Long Island, take exit 33 - Great
Neck, proceed to the second traffic signal at Lakeville Road, then turn right
onto Lakeville Road and proceed 7.9 km (4.9 mi) to Steamboat Road, then turn
left onto Steamboat Road and continue 2.1 km (1.3 mi) to the entrance to the
U.S. Merchant Marine Academy. Proceed past the guard shack and follow the
entrance road to its end, then turn left onto the academy grounds and continue
on the road to the sailing center. The bench marks are on Academy property along
the water and the tide station is located on the sailing center dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6945 A 1998
DESIGNATION: 851 6945 A
MONUMENTATION: Flange-encased Rod VM#: 15689
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 40° 48.7' N ( 40.81106) LONGITUDE: 73° 45.8' W ( -73.76394)
The primary bench mark is located at the SW corner of the Academy property near
the west side of the chapel, 17.65 m (57.9 ft) SW of the SW corner of the
chapel, 4.65 m (15.3 ft) east of the center of the road to the Prosser boat
house, and 3.50 m (11.5 ft) NE of a fire hydrant. The datum point is the top of
a stainless steel rod driven 6.71 m (22.0 ft) to refusal, and encased in a
5-inch NOS logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 8516945 PUBLICATION DATE: 04/27/2018
Name: KINGS POINT, LONG ISLAND SOUND
NY
NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031)
USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6945 C 1998
DESIGNATION: 851 6945 C
MONUMENTATION: Flange-encased Rod VM#: 15645
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID:
LATITUDE: 40° 48.8' N ( 40.81339) LONGITUDE: 73° 45.8' W ( -73.76358)
The bench mark is a flange-encased rod located in a grassy area next to the
steps on the south side of Samuels Hall, 21.80 m (71.5 ft) NNE of the NW corner
of the Wooster Building, 7.70 m (25.3 ft) SE of the NW corner of Samuels Hall,
and 2.15 m (7.1 ft) NW of a 1.2 m (4 ft) high concrete retaining wall. The
datum point is the top of a stainless steel rod driven 6.1 m (20 ft) to refusal,
and encased in a 5-inch NOS logo.
BENCH MARK STAMPING: NO 2 1973
DESIGNATION: 851 6945 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 15690
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete manhole foundation OPUS PID#: BBDM91
LATITUDE: 40° 48.8' N ( 40.81397) LONGITUDE: 73° 45.8' W ( -73.76394)
The bench mark is a disk located in the SW corner of a concrete manhole
foundation at the bend of the main entrance road around Samuels hall, 17.37 m
(57.0 ft) north of the bottom center step of the east entrance to Samuels Hall,
7.70 m (25.3 ft) SW of the centerline of the road, and 0.72 m (2.4 ft) west of
the center of the manhole cover.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 8516945 PUBLICATION DATE: 04/27/2018
Name: KINGS POINT, LONG ISLAND SOUND
NY
NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031)
USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6945 B 1998
DESIGNATION: 851 6945 B
MONUMENTATION: Tidal Station disk VM#: 15691
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 40° 48.7' N ( 40.81178) LONGITUDE: 73° 45.8' W ( -73.76406)
The bench mark is a disk located near the east end of a concrete seawall NW of
the Eldridge Pool, 30.78 m (101.0 ft) south of the SE corner of a metal fence
surrounding the pool, 29.60 m (97.1 ft) east of the SW corner of the 90 degree
bend in the seawall, and 3.33 m (10.9 ft) west of the east end of the seawall.
BENCH MARK STAMPING: 6945 D 2000
DESIGNATION: 851 6945 D
MONUMENTATION: Tidal Station disk VM#: 16352
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Sheetpile and concrete bulkhead OPUS PID:
LATITUDE: 40° 48.8' N ( 40.81336) LONGITUDE: 73° 45.9' W ( -73.76481)
The bench mark is a disk located in the SE end of a sheetpile and concrete
capped bulkhead, 49.54 m (162.5 ft) ESE of the NNW corner of the paved pier,
19.31 m (63.4 ft) SW of the SW corner of the Yocum Sailing Center, 0.51 m (1.7
ft) NW of the NW face of the bulkhead cap, 1.00 m (3.3 ft) north of the south
face of the concrete bulkhead cap, and 1.00 m (3.3 ft) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 8516945 PUBLICATION DATE: 04/27/2018
Name: KINGS POINT, LONG ISLAND SOUND
NY
NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031)
USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6945 E 2003
DESIGNATION: 851 6945 E
MONUMENTATION: Tidal Station disk VM#: 17394
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 40° 48.7' N ( 40.81194) LONGITUDE: 73° 45.9' W ( -73.76439)
The bench mark is a disk set in the top of a concrete sea wall located west of
the Eldridge pool, 40.70 m (133.5 ft) west of the centerline of the road leading
to the tide house, 27.69 m (90.8 ft) WSW of the SW corner of the fence around
the pool, 16.38 m (53.7 ft) south of the southernmost of three cleats set in
concrete monuments, 13.84 m (45.4 ft) north of the 90 degree turn in the sea
wall, 0.90 m (3.0 ft) east of the west face of the bulkhead, and 0.80 m (2.6 ft)
above ground.
BENCH MARK STAMPING: 6945 G 2014
DESIGNATION: 851 6945 G
MONUMENTATION: Tidal Station disk VM#: 21204
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bulkhead OPUS PID#: BBDN94
LATITUDE: 40° 48.8' N ( 40.81250) LONGITUDE: 73° 45.9' W ( -73.76556)
The bench mark is a disk set flush in concrete pier located in the W side of
boat repair shop on new concrete pier, 17.9 m (58.7 ft) S of the fifth light
pole S of the N end of the concrete pier, 9.5 m (31.2 ft) N of the sixth light
pole S of the N end of the concrete pier, 5.4 m (17.7 ft) W of the fourth
Ballard located S of the N end of concrete pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 8516945 PUBLICATION DATE: 04/27/2018
Name: KINGS POINT, LONG ISLAND SOUND
NY
NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031)
USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6945 F 2014
DESIGNATION: 851 6945 F
MONUMENTATION: Tidal Station disk VM#: 21205
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Bulkhead OPUS PID:
LATITUDE: 40° 48.7' N ( 40.81139) LONGITUDE: 73° 45.9' W ( -73.76583)
The bench mark is disk set flush in concrete pier located in the S end of a new
concrete pier on the W side of the boat repair shop, 12.23 m (40.1 ft) S of the
S-most light pole on concrete pier, 3.45 m (11.3 ft) W of the most S Ballard on
the E face of the concrete pier, 2.25 m (7.4 ft) E of the most S Ballard on the
W face of the concrete pier.
BENCH MARK STAMPING: 6945 H 2016
DESIGNATION: 851 6945 H
MONUMENTATION: Tidal Station disk VM#: 21817
AGENCY: NOS IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 40° 48.8' N ( 40.81386) LONGITUDE: 73° 45.9' W ( -73.76453)
The bench mark is located in the great neck area of Long Island at the U.S.
Merchant Marine Academy at Kings Point, set flush in the north facing corner of
the concrete pad, 60.9 m (199.8 ft) east of the east end of the seawall, 20.9 m
(68.6 ft) west of a US Penny set in the NW corner of the concrete step that
leads from the parking lot down to the sea wall, and 2.12 m (7.0 ft) south of
the concrete sea wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 8516945 PUBLICATION DATE: 04/27/2018
Name: KINGS POINT, LONG ISLAND SOUND
NY
NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031)
USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500)
T I D A L D A T U M S
Tidal datums at KINGS POINT, LONG ISLAND SOUND based on:
LENGTH OF SERIES: 16 YEARS
TIME PERIOD: 09/99-08/11, 02/12-01/15, 09/16-08/17
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8467150 BRIDGEPORT, BRIDGEPORT HARBOR
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (10/30/2012) = 4.341
MEAN HIGHER HIGH WATER MHHW = 2.377
MEAN HIGH WATER MHW = 2.267
North American Vertical Datum NAVD88 = 1.268
MEAN SEA LEVEL MSL = 1.186
MEAN TIDE LEVEL MTL = 1.176
MEAN LOW WATER MLW = 0.085
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/06/2018) = -1.223
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6945 A 1998 5.735 3.468
6945 C 1998 5.897 3.630
NO 2 1973 4.271 2.004
6945 B 1998 4.649 2.382
6945 D 2000 4.826 2.559
6945 E 2003 4.574 2.307
6945 G 2014 4.589 2.322
6945 F 2014 4.615 2.348
6945 H 2016 3.889 1.622
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 8516945 PUBLICATION DATE: 04/27/2018
Name: KINGS POINT, LONG ISLAND SOUND
NY
NOAA Chart: 12366 Latitude: 40° 48.6' N ( 40.81031)
USGS Quad: FLUSHING Longitude: 73° 45.9' W ( -73.76500)
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.
Station Location
Published bench mark
Unpublished bench mark
