Superseded Bench Mark Sheet for 8516299, BAYVILLE BRIDGE, OYSTER BAY NY

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                   PUBLICATION DATE:  02/11/1992
Station ID: 8516299                                SUPERCEDED DATE:   04/21/2003
Name:       BAYVILLE BRIDGE, OYSTER BAY, LONG ISLAND SOUND    
            NEW YORK
NOAA Chart: 12365                                  Latitude:         40° 54.2' N
USGS Quad:  BAYVILLE                               Longitude:        73° 33.0' W


To reach the tidal bench marks from exit 41 North on Long Island Expressway,
proceed north on Oyster Bay Road (State Highway 106) for 5.75 miles (9.25 km) to
West Main Street at Oyster Bay, turn left and go west on West Main Street for
0.8 mile (1.3 km) to West Shore Road, veer right onto West Shore Road and go 2.0
miles (3.2 km) 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

MONUMENTATION:           Survey Disk                               VM#:     7080
AGENCY:                                                            PID#:  AE4709
SETTING CLASSIFICATION:  Granite Bridge Cap


The primary bench mark is set in the granite cap of the Bayville bridge approach
on the south end and the east side of the bridge, 19.6 feet (6.0 m) south of the
SW corner of bridge light post #M-2388, 1.5 feet (0.5 m) west of the east edge
of the granite cap, and 0.5 foot (0.2 m) east of the west edge of the cap.



                         BENCH MARK STAMPING:  BRIDGE 1966

MONUMENTATION:           Survey Disk                               VM#:     7079
AGENCY:                                                            PID#:  KU2902
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is 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, 55.5 feet (16.9 m) north of the NW corner of concrete bridge light post
#M-2387, 8.5 feet (2.6 m) west of the SW corner of concrete bridge light post
#M-2388, and 6.9 feet (2.1 m) east of the east curb face of the highway.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                   PUBLICATION DATE:  02/11/1992
Station ID: 8516299                                SUPERCEDED DATE:   04/21/2003
Name:       BAYVILLE BRIDGE, OYSTER BAY, LONG ISLAND SOUND    
            NEW YORK
NOAA Chart: 12365                                  Latitude:         40° 54.2' N
USGS Quad:  BAYVILLE                               Longitude:        73° 33.0' W


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  6299 A 1990

MONUMENTATION:           Survey Disk                               VM#:     7081
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Storm Drain Pad


The bench mark is set in a concrete storm drain pad located at the NW corner of
the intersection of West Shore Road and The Concourse, 16.6 feet (5.1 m) west of
the centerline of West Shore Road, 5.5 feet (1.7 m) north of the south edge of
the storm drain pad, and 3.8 feet (1.2 m) west of the east edge of the pad.



                         BENCH MARK STAMPING:  DRAW 1990

MONUMENTATION:           Survey Disk                               VM#:     7082
AGENCY:                                                            PID#:  AA9628
SETTING CLASSIFICATION:  Concrete Walk


The bench mark is set in the east sidewalk of the Bayville bridge, 39.6 feet
(12.1 m) north of the NW corner of concrete light post #M-2393, 23.7 feet (7.2
m) south of the south edge of the bridge drawspan, 2.7 feet (0.8 m) east of the
east curb face of the bridge, and 2.2 feet (0.7 m) west of the east edge of the
bridge walk.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                   PUBLICATION DATE:  02/11/1992
Station ID: 8516299                                SUPERCEDED DATE:   04/21/2003
Name:       BAYVILLE BRIDGE, OYSTER BAY, LONG ISLAND SOUND    
            NEW YORK
NOAA Chart: 12365                                  Latitude:         40° 54.2' N
USGS Quad:  BAYVILLE                               Longitude:        73° 33.0' W


                            T I D A L   D A T U M S 


Tidal datums at BAYVILLE BRIDGE, OYSTER BAY, LONG ISLAND SOUND based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           JUNE-AUGUST 1990
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8518490 NEW ROCHELLE


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:

     HIGHEST OBSERVED WATER LEVEL (08/20/1990)         =   9.99
     MEAN HIGHER HIGH WATER                     MHHW   =   7.99
     MEAN HIGH WATER                            MHW    =   7.63
     MEAN TIDE LEVEL                            MTL    =   3.94
     MEAN LOW WATER                             MLW    =   0.26
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (07/21/1990)         =  -0.59

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     BRIDGE NO 1 1966                           19.69     12.06
     BRIDGE 1966                                20.08     12.45
     6299 A 1990                                18.56     10.93
     DRAW 1990                                  23.55     15.92


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  4

                                                   PUBLICATION DATE:  02/11/1992
Station ID: 8516299                                SUPERCEDED DATE:   04/21/2003
Name:       BAYVILLE BRIDGE, OYSTER BAY, LONG ISLAND SOUND    
            NEW YORK
NOAA Chart: 12365                                  Latitude:         40° 54.2' N
USGS Quad:  BAYVILLE                               Longitude:        73° 33.0' 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.

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