U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
Station ID: 8516299 PUBLICATION DATE: 09/13/2005
Name: BAYVILLE BRIDGE, OYSTER BAY
NY
NOAA Chart: 12365 Latitude: 40° 54.2' N ( 40.90330)
USGS Quad: BAYVILLE Longitude: 73° 33.0' W ( -73.55000)
To reach the tidal bench marks from exit 41 North on Long Island Expressway,
proceed north on Oyster Bay Road (State Highway 106) for 9.3 km (5.8 mi) to West
Main Street at Oyster Bay, then turn left and proceed west on West Main Street
for 1.3 km (0.8 mi) to West Shore Road, then veer right onto West Shore Road and
proceed north for 3.2 km (2.0 mi) to the Bayville bridge which crosses over Mill
Neck Bay. The bench marks are along West Shore Road near the bridge. The tide
gauge and staff were on the SE bridge fender below the center of the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: BRIDGE NO 1 1966
DESIGNATION: BRIDGE RM 1
MONUMENTATION: Reference Mark disk VM#: 7080
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: AE4709
SETTING CLASSIFICATION: Granite bulkhead of bridge OPUS PID:
LATITUDE: 40° 54.2' N ( 40.90330) LONGITUDE: 73° 33.0' W ( -73.55000)
The primary bench mark is a disk set in the top of the granite retaining wall of
the Bayville bridge approach on the south end and the east side of the bridge,
5.97 m (19.6 ft) south of the SW corner of bridge light post #M-2388, 0.46 m
(1.5 ft) west of the east edge of the coping, and 0.15 m (0.5 ft) east of the
west edge of the coping.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
Station ID: 8516299 PUBLICATION DATE: 09/13/2005
Name: BAYVILLE BRIDGE, OYSTER BAY
NY
NOAA Chart: 12365 Latitude: 40° 54.2' N ( 40.90330)
USGS Quad: BAYVILLE Longitude: 73° 33.0' W ( -73.55000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BRIDGE 1966
DESIGNATION: BRIDGE
MONUMENTATION: Triangulation Station disk VM#: 7079
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: KU2902
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 40° 54.1' N ( 40.90170) LONGITUDE: 73° 32.9' W ( -73.54830)
The bench mark is a disk set in a round concrete monument located in the grass
between the highway and the sidewalk on the east side and the south end of the
Bayville bridge, 16.92 m (55.5 ft) north of the NW corner of concrete bridge
light post #M-2387, 2.59 m (8.5 ft) west of the SW corner of concrete bridge
light post #M-2388, and 2.10 m (6.9 ft) east of the east curb face of the
highway.
BENCH MARK STAMPING: 6299 A 1990
DESIGNATION: 851 6299 A
MONUMENTATION: Tidal Station disk VM#: 7081
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete storm drain pad OPUS PID:
LATITUDE: 40° 54.2' N ( 40.90330) LONGITUDE: 73° 33.0' W ( -73.55000)
The bench mark is a disk set in a concrete storm drain pad located at the NW
corner of the intersection of West Shore Road and The Concourse, 5.06 m (16.6
ft) west of the centerline of West Shore Road, 1.68 m (5.5 ft) north of the
south edge of the storm drain pad, and 1.16 m (3.8 ft) west of the east edge of
the pad.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
Station ID: 8516299 PUBLICATION DATE: 09/13/2005
Name: BAYVILLE BRIDGE, OYSTER BAY
NY
NOAA Chart: 12365 Latitude: 40° 54.2' N ( 40.90330)
USGS Quad: BAYVILLE Longitude: 73° 33.0' W ( -73.55000)
T I D A L D A T U M S
Tidal datums at BAYVILLE BRIDGE, OYSTER BAY based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: June 1990 - August 1990
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8518490 NEW ROCHELLE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 2.442
MEAN HIGH WATER MHW = 2.332
MEAN TIDE LEVEL MTL = 1.205
MEAN SEA LEVEL MSL = 1.200
MEAN LOW WATER MLW = 0.078
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
BRIDGE NO 1 1966 5.958 3.626
BRIDGE 1966 6.076 3.744
6299 A 1990 5.612 3.280
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
Station ID: 8516299 PUBLICATION DATE: 09/13/2005
Name: BAYVILLE BRIDGE, OYSTER BAY
NY
NOAA Chart: 12365 Latitude: 40° 54.2' N ( 40.90330)
USGS Quad: BAYVILLE Longitude: 73° 33.0' W ( -73.55000)
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.