Superseded Bench Mark Sheet for 2695535, Bermuda Biological Station

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  11/15/1995
Station ID: 2695535                                SUPERCEDED DATE:   04/21/2003
Name:       ST. GEORGES ISLAND, BERMUDA, ST. GEORGES HARBOR   
NOAA Chart: 64o41.7W                               Latitude:         32° 22.2' N
USGS Quad:                                         Longitude:        64° 41.7' W


To reach the tidal bench marks from St. Georges, proceed SW on Ferry Road for
1.5 miles (2.4 km) to Bermuda Biological Station in St. Georges West.  The bench
marks are on the Biological Station grounds and on the Esso Bermuda property to
the north.  The tide gage and staff are located in the vicinity of the Scott
Laboratory building.


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


                 PRIMARY BENCH MARK STAMPING:  5535 H 1978

MONUMENTATION:           Survey Disk                               VM#:     1751
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Boat Landing


The bench mark is set in the top of a concrete boat landing in the vicinity of
the Scott Laboratory building, 28 feet (9 m) NW of the SW corner of the
building, 27 feet (8 m) WSW of the SW corner of the building, 25.5 feet (7.8 m)
SW of the NW corner of the building, and 4 feet (1 m) below the road bed.



                         BENCH MARK STAMPING:  5535 D 1978

MONUMENTATION:           Survey Disk                               VM#:     1748
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Sea Wall


The bench mark is set in the top of a concrete sea wall halfway down the boat
ramp on the west side of the boat ramp, 24.6 feet (7.5 m) north of the bulkhead,
7 feet (2 m) east of the SE corner of the Scott Laboratory building, 6 feet (2
m) west of the centerline of the boat ramp, and level with the ramp.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                   PUBLICATION DATE:  11/15/1995
Station ID: 2695535                                SUPERCEDED DATE:   04/21/2003
Name:       ST. GEORGES ISLAND, BERMUDA, ST. GEORGES HARBOR   
NOAA Chart: 64o41.7W                               Latitude:         32° 22.2' N
USGS Quad:                                         Longitude:        64° 41.7' W


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


                         BENCH MARK STAMPING:  5535 F 1978

MONUMENTATION:           Survey Disk                               VM#:     1749
AGENCY:                                                            PID#:  DE6071
SETTING CLASSIFICATION:  Concrete Sidewalk


The bench mark is set in a concrete sidewalk at the SW corner of the Alfred C.
Redfield Library building, 16 feet (5 m) west of the entrance to the library,
1.2 feet (0.4 m) east of the SW corner of the building, 0.5 foot (0.2 m) south
of the south face of the building, and level with the sidewalk.



                         BENCH MARK STAMPING:  5535 G 1978

MONUMENTATION:           Survey Disk                               VM#:     1750
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in a concrete monument on the hill in front of the main
building, 72.6 feet (22.1 m) west of the SW corner of the library building, 64.7
feet (19.7 m) NE of the NW corner of the main building, 40.4 feet (12.3 m) north
of the first step leading to the main building, and level with the ground.



                         BENCH MARK STAMPING:  5540 A 1979

MONUMENTATION:           Survey Disk                               VM#:     1752
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Foundation


The bench mark is set flush in the top of a 3 x 4 x 0.5 foot (1 x 1 x 0.2 m)
concrete footing on top of bedrock, SSW of Esso Fuel Pier, 65 feet (20 m) east
of a storage and fuel oil test building, and 50 feet (15 m) south of the
approximate water edge.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                   PUBLICATION DATE:  11/15/1995
Station ID: 2695535                                SUPERCEDED DATE:   04/21/2003
Name:       ST. GEORGES ISLAND, BERMUDA, ST. GEORGES HARBOR   
NOAA Chart: 64o41.7W                               Latitude:         32° 22.2' N
USGS Quad:                                         Longitude:        64° 41.7' W


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


                         BENCH MARK STAMPING:  5540 C 1979

MONUMENTATION:           Survey Disk                               VM#:     1753
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Stone Wall


The bench mark is set flush in the top of a wall near the Esso Terminal guard
house, 34 feet (10 m) north of the centerline of the road leading to the Esso
Terminal, 16.8 feet (5.1 m) east of the SE corner of the guard house, 1 foot
(0.3 m) south of the steps leading uphill to storage tanks, and 1.8 feet   (0.5
m) above ground level.



                         BENCH MARK STAMPING:  4

MONUMENTATION:           Survey Disk                               VM#:     1754
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in the base of an abandoned mail box at the intersection
of Biological Station Drive and Ferry Road, 22.0 feet (6.7 m) south of the
centerline of Ferry Road, 16 feet (5 m) east of the centerline of Biological
Station Drive, 1.4 feet (0.4 m) NW of a 1.7-foot (0.5 m) diameter cast iron pipe
set vertically in a concrete base, and about level with the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                   PUBLICATION DATE:  11/15/1995
Station ID: 2695535                                SUPERCEDED DATE:   04/21/2003
Name:       ST. GEORGES ISLAND, BERMUDA, ST. GEORGES HARBOR   
NOAA Chart: 64o41.7W                               Latitude:         32° 22.2' N
USGS Quad:                                         Longitude:        64° 41.7' W


                            T I D A L   D A T U M S 


Tidal datums at ST. GEORGES ISLAND, BERMUDA, ST. GEORGES HARBOR based on:

     LENGTH OF SERIES:      17 YEARS
     TIME PERIOD:           1960-1978
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:   


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

     HIGHEST OBSERVED WATER LEVEL (12/01/1967)         =   5.10
     MEAN HIGHER HIGH WATER                     MHHW   =   2.78
     MEAN HIGH WATER                            MHW    =   2.52
     MEAN TIDE LEVEL                            MTL    =   1.30
     MEAN LOW WATER                             MLW    =   0.07
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (05/01/1946)         =  -1.90



Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     5535 H 1978                                 4.83      2.31
     5535 D 1978                                 3.98      1.46
     5535 F 1978                                19.15     16.63
     5535 G 1978                                23.11     20.59
     5540 A 1979                                43.72     41.20
     5540 C 1979                                20.69     18.17
     4                                          22.50     19.98


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  5

                                                   PUBLICATION DATE:  11/15/1995
Station ID: 2695535                                SUPERCEDED DATE:   04/21/2003
Name:       ST. GEORGES ISLAND, BERMUDA, ST. GEORGES HARBOR   
NOAA Chart: 64o41.7W                               Latitude:         32° 22.2' N
USGS Quad:                                         Longitude:        64° 41.7' 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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