U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 08/13/1991
Station ID: 8514322 SUPERCEDED DATE: 04/21/2003
Name: PATCHOGUE, PATCHOGUE RIVER
NEW YORK
NOAA Chart: 12353 Latitude: 40° 45.0' N
USGS Quad: PATCHOGUE Longitude: 73° 1.1' W
To reach the tidal bench marks from the intersection of West Main Street
(Montauk Highway) and River Avenue in Patchogue, proceed south on River Avenue
for 1.1 miles (1.8 km), then turn left on Price Street and go 0.2 mile (0.3 km)
to River Point Marine. The bench marks are near the marina and along the River
Avenue. The tide gauge and staff were near the inside corner of the main marina
pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4322 A 1989
MONUMENTATION: Survey Disk VM#: 4862
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Sea Wall
The primary bench mark is set flush in the top of the concrete sea wall at River
Point Marine, beneath the wood deck along the waterfront, 134 feet (41 m) north
of the 6-foot (2 m) high wooden fence on the south side of the marina, 123 feet
(37 m) south of a 40-foot (12 m) high wooden pole near the marina snack bar, 6.4
feet (2.0 m) west of the east edge of the deck, and 1.8 feet (0.5 m) east of the
west edge of the deck.
BENCH MARK STAMPING: Z 37 1932 21.752
MONUMENTATION: Survey Disk VM#: 4861
AGENCY: PID#: KU0520
SETTING CLASSIFICATION: Concrete Step
The bench mark is set in the middle of the concrete step at the level of the
threshold, in front of the double doors on the east side of the River Avenue
grade school in Patchogue, between Division Street and Montauk Highway, and 0.5
foot (0.l2 m) in front of the double doors.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 08/13/1991
Station ID: 8514322 SUPERCEDED DATE: 04/21/2003
Name: PATCHOGUE, PATCHOGUE RIVER
NEW YORK
NOAA Chart: 12353 Latitude: 40° 45.0' N
USGS Quad: PATCHOGUE Longitude: 73° 1.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4322 B 1989
MONUMENTATION: Survey Disk VM#: 4863
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Sea Wall
The bench mark is set flush in the top of the concrete sea wall south of River
Point Marine, beneath the wood deck along the waterfront at #37 Mapes Avenue,
77.4 feet (23.6 m) SE of the NE corner of the house, 35.3 feet (10.8 m) SE of
the SE corner of the house, 9.5 feet (2.9 m) west of the east side of the deck,
and 0.5 foot (0.2 m) east of the west side.
BENCH MARK STAMPING: 4322 C 1989
MONUMENTATION: Survey Disk VM#: 4864
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is 0.1 mile (0.2 km) west of River Point Marine on Price Street,
at the intersection of Price Street and the entrance to Fairfield on the Bay
(condos), 47 feet (14 m) east of a water meter in the street, 31.4 feet (9.6 m)
SW of the SW corner of the residence at #45 Price Street, and 4.0 feet (1.2 m)
NW of power pole #4. The bench mark is 0.3 foot (0.1 m) below ground level,
crimped to a stainless steel rod driven 68 feet (21 m) to substantial
resistance, and encased in a 5-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 08/13/1991
Station ID: 8514322 SUPERCEDED DATE: 04/21/2003
Name: PATCHOGUE, PATCHOGUE RIVER
NEW YORK
NOAA Chart: 12353 Latitude: 40° 45.0' N
USGS Quad: PATCHOGUE Longitude: 73° 1.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4322 D 1989
MONUMENTATION: Survey Disk VM#: 4865
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is 1.1 miles (1.8 km) south on River Avenue from its intersection
with West Main Street, 58.0 (17.7 m) NW of the NW corner of a house, 46.7 feet
(14.2 m) SW of the SW corner of the house at #395 River Avenue, and 2.1 feet
(0.6 m) NE of power pole #46J. The bench mark is 0.3 foot (0.1 m) below ground
level, crimped to a stainless steel rod driven 56 feet (17 m) to substantial
resistance, and encased in a 5-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 4322 E 1989
MONUMENTATION: Survey Disk VM#: 4866
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is at the NE corner of the intersection of River Avenue and
Crescent Street, 40.0 feet (12.2 m) NE of a guide pole on the west side of River
Avenue, 6.0 feet (1.8 m) NE of NYT power pole #43, and 2.6 feet (0.8 m) NW of
the corner post of a chain link fence. The bench mark is 0.4 foot (0.1 m) below
ground level, crimped to a stainless steel rod driven 78 feet (24 m) to
substantial resistance, and encased in a 5-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 08/13/1991
Station ID: 8514322 SUPERCEDED DATE: 04/21/2003
Name: PATCHOGUE, PATCHOGUE RIVER
NEW YORK
NOAA Chart: 12353 Latitude: 40° 45.0' N
USGS Quad: PATCHOGUE Longitude: 73° 1.1' W
T I D A L D A T U M S
Tidal datums at PATCHOGUE, PATCHOGUE RIVER based on:
LENGTH OF SERIES: 12 MONTHS
TIME PERIOD: AUGUST 1989-JULY 1990
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8518750 THE BATTERY
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (11/16/1989) = 3.14
MEAN HIGHER HIGH WATER MHHW = 1.39
MEAN HIGH WATER MHW = 1.22
MEAN TIDE LEVEL MTL = 0.66
MEAN LOW WATER MLW = 0.10
MEAN LOWER LOW WATER MLLW = 0.00
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = -0.20
LOWEST OBSERVED WATER LEVEL (02/21/1990) = -1.12
* NGVD reference based on elevations published in Quad 400731, 1968, and NOS
leveling of 1991.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
4322 A 1989 3.44 2.22
Z 37 1932 21.752 21.56 20.34
4322 B 1989 3.38 2.16
4322 C 1989 5.27 4.05
4322 D 1989 4.48 3.26
4322 E 1989 4.31 3.09
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 08/13/1991
Station ID: 8514322 SUPERCEDED DATE: 04/21/2003
Name: PATCHOGUE, PATCHOGUE RIVER
NEW YORK
NOAA Chart: 12353 Latitude: 40° 45.0' N
USGS Quad: PATCHOGUE Longitude: 73° 1.1' W
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 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.