U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8514560 PUBLICATION DATE: 04/21/2003
Name: PORT JEFFERSON
NY
NOAA Chart: 12362 Latitude: 40° 57.0' N ( 40.95000)
USGS Quad: Port Jefferson (1967) Longitude: 73° 4.6' W ( -73.07670)
To reach the tidal bench marks from the intersection of Main Street and State
Highway 25A (West Broadway) in Port Jefferson, proceed west on Highway 25A for
0.3 km (0.2 mi) to Beach Street, then north on Beach Street to Long Island
Lighting Company (LILCO). The bench marks are on LILCO property and along Beach
Street and West Broadway. The tide gauge and staff were on the fuel dock at the
coal elevator.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4560 B 1981
MONUMENTATION: Tidal Station disk VM#: 280
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 40° 57.0' N ( 40.95000) LONGITUDE: 73° 4.6' W ( -73.07670)
The primary bench mark is a disk located along Beach Street, east of the LILCO
gate entrance to a parking lot, 72.36 m (237.4 ft) south of the brick gate
building, 5.33 m (17.5 ft) east of the centerline of Beach Street, and 0.46 m
(1.5 ft) SW of a fence corner. The bench mark is 15 cm (0.5 ft) below ground
level, crimped to a galvanized steel rod driven 12.2 m (40 ft) to refusal, and
encased in a 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8514560 PUBLICATION DATE: 04/21/2003
Name: PORT JEFFERSON
NY
NOAA Chart: 12362 Latitude: 40° 57.0' N ( 40.95000)
USGS Quad: Port Jefferson (1967) Longitude: 73° 4.6' W ( -73.07670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 1 1957
DESIGNATION: TIDAL 1 STA II 20
MONUMENTATION: Tidal Station disk VM#: 274
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: KU0506
SETTING CLASSIFICATION: Concrete base OPUS PID:
LATITUDE: 40° 57.0' N ( 40.95000) LONGITUDE: 73° 4.6' W ( -73.07670)
The bench mark is a disk set in the top of the concrete base of the south leg of
the elevator support at the LILCO plant, 21.03 m (69 ft) NE of the centerline of
the plant road, 2.74 m (9 ft) SW of the NE end of the concrete base, 1.83 m (6
ft) NE of the SW end of the concrete base, 0.30 m (1.0 ft) NW of the SE side of
the base, and 0.76 m (2.5 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8514560 PUBLICATION DATE: 04/21/2003
Name: PORT JEFFERSON
NY
NOAA Chart: 12362 Latitude: 40° 57.0' N ( 40.95000)
USGS Quad: Port Jefferson (1967) Longitude: 73° 4.6' W ( -73.07670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1957
DESIGNATION: TIDAL 2 STA II 20
MONUMENTATION: Tidal Station disk VM#: 275
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: KU0505
SETTING CLASSIFICATION: Retaining wall OPUS PID:
LATITUDE: 40° 56.9' N ( 40.94830) LONGITUDE: 73° 4.5' W ( -73.07500)
The bench mark is a disk set in the top of a concrete retaining wall on the west
side of Beach Street, across the street from the Northville Consolidated
Petroleum Plant, 35.05 m (115 ft) NE of the centerline of Sheldrake Street, 3.66
m (12 ft) north of the SW end of the retaining wall, 3.66 m (12 ft) south of the
north end of the retaining wall, 2.74 m (9 ft) west of the centerline of the
Beach Street, and 1.22 m (4 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8514560 PUBLICATION DATE: 04/21/2003
Name: PORT JEFFERSON
NY
NOAA Chart: 12362 Latitude: 40° 57.0' N ( 40.95000)
USGS Quad: Port Jefferson (1967) Longitude: 73° 4.6' W ( -73.07670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO STAMPING 2
DESIGNATION: TIDAL 11 STA II 20
MONUMENTATION: Tidal Station disk VM#: 278
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: KU0499
SETTING CLASSIFICATION: Building OPUS PID:
LATITUDE: 40° 56.8' N ( 40.94670) LONGITUDE: 73° 4.1' W ( -73.06830)
The bench mark is a disk set vertically on the Brookhaven Town Tax Office
building at the NE corner of Main and East Main Streets, 17.37 m (57.0 ft) north
of the centerline of East Main Street, 8.35 m (27.4 ft) east of the centerline
of Main Street, 6.86 m (22.5 ft) south of the NW corner of the building, and
0.15 m (0.5 ft) above ground level.
BENCH MARK STAMPING: 851-4560 J 1977
DESIGNATION: 851 4560 J
MONUMENTATION: Tidal Station disk VM#: 282
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete floor OPUS PID:
LATITUDE: 40° 57.0' N ( 40.95000) LONGITUDE: 73° 4.6' W ( -73.07670)
The bench mark is a disk set flush in the concrete floor of the brick gate house
at the entrance to the LILCO plant, 5.49 m (18.0 ft) east of the centerline of
the entrance road to the plant, 2 m (5 ft) north of the south wall of the gate
house, and 0.76 m (2.5 ft) east of the west wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8514560 PUBLICATION DATE: 04/21/2003
Name: PORT JEFFERSON
NY
NOAA Chart: 12362 Latitude: 40° 57.0' N ( 40.95000)
USGS Quad: Port Jefferson (1967) Longitude: 73° 4.6' W ( -73.07670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 851-4560 K 1977
DESIGNATION: 851 4560 K
MONUMENTATION: Tidal Station disk VM#: 283
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified deep rod OPUS PID:
LATITUDE: 40° 57.0' N ( 40.95000) LONGITUDE: 73° 4.6' W ( -73.07670)
The bench mark is a disk located on the west side of Beach Street near the LILCO
parking lot gate, 111.56 m (366 ft) south of the parking lot gate, 17.98 m (59
ft) NNW of power pole #16, 12.80 m (42 ft) SW of power pole #17, and 4.57 m (15
ft) west of the west edge of Beach Street. The bench mark is at ground level,
crimped to an unspecified steel rod driven 12 m (40 ft) to refusal, and encased
in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 4560 M 1990
DESIGNATION: 851 4560 M
MONUMENTATION: Tidal Station disk VM#: 285
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 40° 57.0' N ( 40.95000) LONGITUDE: 73° 4.6' W ( -73.07670)
The bench mark is a disk set on the east side of Beach Street, south of Bench
Mark NO 2 1957, 9.63 m (31.6 ft) ESE of the SE corner of the bottom step of the
stairway to a private residence at 215 Beach Street, 12.10 m (39.7 ft) ENE of
power pole #8, 8.05 m (26.4 ft) north of the south end of a guard rail, and 0.30
m (1.0 ft) north of a witness post. The bench mark is just below ground level,
crimped to a stainless steel rod driven 18.3 m (60 ft) to refusal, and encased
in a PVC pipe and concrete kick block.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8514560 PUBLICATION DATE: 04/21/2003
Name: PORT JEFFERSON
NY
NOAA Chart: 12362 Latitude: 40° 57.0' N ( 40.95000)
USGS Quad: Port Jefferson (1967) Longitude: 73° 4.6' W ( -73.07670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4560 A 1977
DESIGNATION: 851 4560 A
MONUMENTATION: Tidal Station disk VM#: 299
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete step OPUS PID:
LATITUDE: 40° 57.0' N ( 40.95000) LONGITUDE: 73° 4.6' W ( -73.07670)
The bench mark is a disk set flush in the top step of the north side entrance to
the National Bank of North America building, 20.27 m (66.5 ft) ENE of Barnum
Avenue, 13.11 m (43 ft) south of the centerline of West Broadway, 10.36 m (34.0
ft) north of the door to the bank, 6.71 m (22.0 ft) SW of power pole #704, and
0.30 m (1.0 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8514560 PUBLICATION DATE: 04/21/2003
Name: PORT JEFFERSON
NY
NOAA Chart: 12362 Latitude: 40° 57.0' N ( 40.95000)
USGS Quad: Port Jefferson (1967) Longitude: 73° 4.6' W ( -73.07670)
T I D A L D A T U M S
Tidal datums at PORT JEFFERSON based on:
LENGTH OF SERIES: 11 Years
TIME PERIOD: October 1981 - September 1992
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 (02/06/1978) = 3.616
MEAN HIGHER HIGH WATER MHHW = 2.181
MEAN HIGH WATER MHW = 2.083
North American Vertical Datum NAVD88 = 1.132
MEAN TIDE LEVEL MTL = 1.076
MEAN SEA LEVEL MSL = 1.073
MEAN LOW WATER MLW = 0.068
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/10/1978) = -1.169
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4560 B 1981 4.083 2.000
NO 1 1957 5.174 3.091
NO 2 1957 4.973 2.890
NO STAMPING 2 6.728 4.645
851-4560 J 1977 4.606 2.523
851-4560 K 1977 3.781 1.698
4560 M 1990 5.164 3.081
4560 A 1977 3.701 1.618
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8514560 PUBLICATION DATE: 04/21/2003
Name: PORT JEFFERSON
NY
NOAA Chart: 12362 Latitude: 40° 57.0' N ( 40.95000)
USGS Quad: Port Jefferson (1967) Longitude: 73° 4.6' W ( -73.07670)
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.