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

                                                                                
Station ID: 9751381                                PUBLICATION DATE:  07/03/2013
Name:       LAMESHUR BAY, ST. JOHN                            
            VIRGIN ISLANDS
NOAA Chart: 25641                                  Latitude:         18° 19.1' N
USGS Quad:  WESTERN ST JOHN                        Longitude:        64° 43.5' W


To reach the benchmarks from the intersection of Highway 10 and Highway 107
South in Coral Bay, St John, USVI, proceed south and west on 107 South for 8.53
km (5.3 miles) to the end of the pavement, then proceed west on Lameshur Bay
Trail for 1.45 km (0.9 miles) to Yawzi Point Trail, turn left (south) and
proceed 0.16 km (0.1 miles) to the Lameshur Bay Research Lab.  The water level
sensor is located on the south side of the pier . The benchmark are along the
gravel road and a rock outcropping.


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


                 PRIMARY BENCH MARK STAMPING:  1381 A 2006
                         DESIGNATION:          975 1381 A

MONUMENTATION:           Tidal Station disk                        VM#:    18179
AGENCY:                  National Ocean Service (NOS)              PID#:  DL3636
SETTING CLASSIFICATION:  Concrete pad


The bench mark is a disk set in the NE corner of the concrete pad for a park
service sign at the foot of a wooden pier, located 26.35 m (86.5 ft) SSE of the
SE corner of the main lab building, 2.50 m (8.2 ft) WSW of the north end of the
pier, 2.40 m ( 7.87 ft) NW of the NOAA shelter, and 2.35 m (7.71 ft) south of a
concrete walkway leading to the pier.



                         BENCH MARK STAMPING:  BM 2 1967
                         DESIGNATION:          975 1381 TIDAL 2

MONUMENTATION:           Survey disk                               VM#:    15008
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  DL3638
SETTING CLASSIFICATION:  Rock outcrop


The bench mark is a disk set on a rocky outcrop to the south of the research
pier, located 60.96 m (200.0 ft) south of the pier, 26.45 m (86.78 ft) south of
BM 1381 C and 1.40 m (4.59 ft) west of the water's edge.

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

                                                                                
Station ID: 9751381                                PUBLICATION DATE:  07/03/2013
Name:       LAMESHUR BAY, ST. JOHN                            
            VIRGIN ISLANDS
NOAA Chart: 25641                                  Latitude:         18° 19.1' N
USGS Quad:  WESTERN ST JOHN                        Longitude:        64° 43.5' W


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


                         BENCH MARK STAMPING:  BM 3 1967
                         DESIGNATION:          975 1381 TIDAL 3

MONUMENTATION:           Survey disk                               VM#:    15009
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID:         
SETTING CLASSIFICATION:  Crevice


The bench mark is a disk set in a crevice on the first point visible from the
pier south of the Viers pier, and 76.20 m (250.0 ft) south of the pier, 10.80 m
(35.43 ft) north of BM 3, and 2.55 (8.37 ft) west of the water's edge.



                         BENCH MARK STAMPING:  NO 5 1972
                         DESIGNATION:          975 1381 TIDAL 5

MONUMENTATION:           Survey disk                               VM#:    15011
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  DL3635
SETTING CLASSIFICATION:  Sidewalk


The bench mark is a disk set flush in the SE corner of the sidewalk for the
Viers Lab Building, located on the Viers property at Lameshur Bay St. John,
27.30 m (89.6 ft) NW of the foot of the pier, 1.75 m (5.7 ft) north of the
centerline of a gravel road leading to the pier, and 1.65 m (5.4 ft) SW of the
SW corner of the lab building.



                         BENCH MARK STAMPING:  1381 B 2006
                         DESIGNATION:          975 1381 B

MONUMENTATION:           Tidal Station disk                        VM#:    18180
AGENCY:                  National Ocean Service (NOS)              PID#:  DL3634
SETTING CLASSIFICATION:  Concrete pad


The bench mark is a disk set in the SE corner of a concrete pad for an
electrical box, located 21.15 m (69.4 ft) NNW of the SW corner of the lab
building, 3.30 m (10.8 ft) ESE of a power pole number 2-46, and 2.10 m (6.9 ft)
north of the gravel road.

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

                                                                                
Station ID: 9751381                                PUBLICATION DATE:  07/03/2013
Name:       LAMESHUR BAY, ST. JOHN                            
            VIRGIN ISLANDS
NOAA Chart: 25641                                  Latitude:         18° 19.1' N
USGS Quad:  WESTERN ST JOHN                        Longitude:        64° 43.5' W


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


                         BENCH MARK STAMPING:  1381 C 2007
                         DESIGNATION:          975 1381 C

MONUMENTATION:           Tidal Station disk                        VM#:    18305
AGENCY:                  National Ocean Service (NOS)              PID#:  DL3637
SETTING CLASSIFICATION:  Rock outcrop


The benchmark is a disk set in a rock outcropping south of the pier, 26.10 m
(85.6 ft) south of the centerline of the Viers pier, 26.45 m (86.8 ft) north of
BM 2, 0.30 m (1.0 ft) west of the water's edge, and 0.55 m (1.8 ft) above the
water line.

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

                                                                                
Station ID: 9751381                                PUBLICATION DATE:  07/03/2013
Name:       LAMESHUR BAY, ST. JOHN                            
            VIRGIN ISLANDS
NOAA Chart: 25641                                  Latitude:         18° 19.1' N
USGS Quad:  WESTERN ST JOHN                        Longitude:        64° 43.5' W


                            T I D A L   D A T U M S 


Tidal datums at LAMESHUR BAY, ST. JOHN based on:

     LENGTH OF SERIES:      5 YEARS
     TIME PERIOD:           Sept. 2006 - Aug. 2009 and Sept. 2010 - Aug. 2012
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  9751639 CHARLOTTE AMALIE, ST. THOMAS


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

     HIGHEST OBSERVED WATER LEVEL (08/30/2010)         =  0.522
     MEAN HIGHER HIGH WATER                     MHHW   =  0.250
     MEAN HIGH WATER                            MHW    =  0.235
     MEAN TIDE LEVEL                            MTL    =  0.126
     MEAN SEA LEVEL                             MSL    =  0.118
     Virgin Islands Vertical Datum of 2009      VIVD09 =  0.113
     MEAN LOW WATER                             MLW    =  0.016
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/10/2009)         = -0.190



Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     1381 A 2006                                 1.193    0.958
     BM 2 1967                                   0.678    0.443
     BM 3 1967                                   1.188    0.953
     NO 5 1972                                   2.069    1.834
     1381 B 2006                                 2.778    2.543
     1381 C 2007                                 0.753    0.518


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

                                                                                
Station ID: 9751381                                PUBLICATION DATE:  07/03/2013
Name:       LAMESHUR BAY, ST. JOHN                            
            VIRGIN ISLANDS
NOAA Chart: 25641                                  Latitude:         18° 19.1' N
USGS Quad:  WESTERN ST JOHN                        Longitude:        64° 43.5' 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 defined island datum (VIVD09).  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.

Virgin Islands Vertical Datum of 2009 (VIVD09) is a fixed datum derived from
a simultaneous, least squares, minimum constraint adjustment of leveling
observations.  Local mean sea level relative to the 1983-2001 National Tidal
Datum Epoch observed at tide stations 9751401 located at Lime Tree Bay,
St. Croix, 9751381 located at Lameshur Bay, St. John, and 9751639 located at
Charlotte Amalie, St Thomas was held fixed as the single initial constraint.
VIVD09 replaces all previous height system as the national standard geodetic
reference for heights in the Virgin Islands.  Bench mark elevations relative
to VIVD09 are available from NGS through the World Wide Web at 
National Geodetic Survey.

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 VIVD09 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have VIVD09 elevations.
The VIVD09 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, VIVD09 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from VIVD09 elevations listed for
each bench mark in the NGS database.