Superseded Bench Mark Sheet for 9751373, ST JOHNS ISLAND, CORAL HARBOR VI

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:  08/15/1991
Station ID: 9751373                                SUPERCEDED DATE:   04/21/2003
Name:       CORAL HARBOR, ST. JOHN                            
            VIRGIN ISLANDS
NOAA Chart: 25641                                  Latitude:         18° 20.9' N
USGS Quad:  WESTERN ST. JOHN                       Longitude:        64° 43.0' W


To reach the tidal bench marks from the US Post Office on King Street (State
Highway 105) in Cruz Bay, proceed NNE on King Street for 0.1 mile (0.2 km) to
the Y-intersection with North Shore Road (State Highway 20), the NE on North
Shore Road for approximately 0.1 mile (0.2 km) to the entrance to the National
Park Service (NPS) Headquarters.  The bench marks are on NPS property and near
Coral Bay Fire Department.  The tide gauge and staff were on the NPS wharf.


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


                 PRIMARY BENCH MARK STAMPING:  1373 A 1983

MONUMENTATION:           Survey Disk                               VM#:     7929
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Pier


The primary bench mark is set in the NW corner of the shore end of a concrete
pier immediately south of Redbeards Saloon, 0.9 foot (0.3 m) east of the west
edge of the wharf, and 0.9 foot (0.3 m) south of the north edge of the wharf.a



                         BENCH MARK STAMPING:  1373 B 1983

MONUMENTATION:           Survey Disk                               VM#:     7930
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set in the NE concrete foundation of the US Public Health
Shelter located just east of Coral Bay Fire Department, 35.8 feet (10.9 m) south
of Centerline Road, 2.9 feet (0.9 m) west of the NE corner of the shelter, and
0.9 foot       (0.3 m) east of the steps on the north of the shelter.

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

                                                   PUBLICATION DATE:  08/15/1991
Station ID: 9751373                                SUPERCEDED DATE:   04/21/2003
Name:       CORAL HARBOR, ST. JOHN                            
            VIRGIN ISLANDS
NOAA Chart: 25641                                  Latitude:         18° 20.9' N
USGS Quad:  WESTERN ST. JOHN                       Longitude:        64° 43.0' W


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


                         BENCH MARK STAMPING:  1373 C 1983

MONUMENTATION:           Survey Disk                               VM#:     7931
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Retaining Wall


The bench mark is set in the concrete retaining wall of a concrete drain on the
west side of Coral Bay Fire Department, 11.1 feet (3.4 m) east of a chain link
fence around a school yard, and 8.1 feet (2.5 m) SW of the NW corner of the Fire
Department building.



                         BENCH MARK STAMPING:  NO STAMPING 1

MONUMENTATION:           Survey Disk                               VM#:     7932
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Rock Outcrop


The bench mark is set in a rock on the east side of a point about 330 feet (101
m) west of the wharf, and 6.5 feet (2.0 m) inshore from the approximate high
water line.  NOTE: The bench mark is historically known as 2 1924.



                         BENCH MARK STAMPING:  NO STAMPING 2

MONUMENTATION:           Survey Disk                               VM#:    12489
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Retaining Wall


The bench mark is set in the concrete retaining wall of a cistern just east of a
school house, and about 655 feet (200 m) NE of the wharf.  NOTE:  The bench mark
is historically known as 3 1924.

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

                                                   PUBLICATION DATE:  08/15/1991
Station ID: 9751373                                SUPERCEDED DATE:   04/21/2003
Name:       CORAL HARBOR, ST. JOHN                            
            VIRGIN ISLANDS
NOAA Chart: 25641                                  Latitude:         18° 20.9' N
USGS Quad:  WESTERN ST. JOHN                       Longitude:        64° 43.0' W


                            T I D A L   D A T U M S 


Tidal datums at CORAL HARBOR, ST. JOHN based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           MARCH-MAY 1983
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  9751639 CHARLOTTE AMALIE


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

     HIGHEST OBSERVED WATER LEVEL (05/13/1983)         =   1.38
     MEAN HIGHER HIGH WATER                     MHHW   =   0.93
     MEAN HIGH WATER                            MHW    =   0.82
     MEAN TIDE LEVEL                            MTL    =   0.46
     MEAN LOW WATER                             MLW    =   0.09
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (05/14/1983)         =  -0.08



Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     1373 A 1983                                 1.82      1.00
     1373 B 1983                                15.39     14.57
     1373 C 1983                                18.30     17.48
     NO STAMPING 1                               2.65      1.83
     NO STAMPING 2                              26.63     25.81


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

                                                   PUBLICATION DATE:  08/15/1991
Station ID: 9751373                                SUPERCEDED DATE:   04/21/2003
Name:       CORAL HARBOR, ST. JOHN                            
            VIRGIN ISLANDS
NOAA Chart: 25641                                  Latitude:         18° 20.9' N
USGS Quad:  WESTERN ST. JOHN                       Longitude:        64° 43.0' 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 any other fixed island datum.

This tide station location has a local island datum.  Island datums
are specific fixed geodetic datums whose elevation relationship 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.

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