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Bench Mark Sheet for 9751467, Lovango Cay, St. John VI

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

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

                                                                                
Station ID: 9751467                         PUBLICATION DATE:  11/08/2011
Name:       LOVANGO CAY, ST JOHN                              
            VI
NOAA Chart: 25647                           Latitude:   18° 21.6' N (  18.36067)
USGS Quad:  Eastern St. Thomas              Longitude:  64° 48.2' W ( -64.80353)


To reach the bench marks by boat from the Ferry Terminal in Redhook, St Thomas
proceed 0.8km (0.5 mi) ENE from the harbor, then 3.2km (2 mi) NE to the north
side of Two Brothers rocks, and continue 2.4km (1.5 mi) NE to the western most
of two identical wooden docks on the south side of Lovango Cay.  The Aquatrak
well is midway along the dock and the benchmarks are along the shore.


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


                 PRIMARY BENCH MARK STAMPING:  1467 B 2011
                         DESIGNATION:          975 1467 B

MONUMENTATION:           Bench Mark disk                       VM#:        20003
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  In rock outcrop                       OPUS PID#: BBCM26
LATITUDE:   18° 21.7' N (  18.36102)          LONGITUDE:  64° 48.2' W ( -64.80387)


The primary bench mark is a disk set at the base of a bedrock slope above a
stone beach, 49.59 m (162.7 ft) west of bench mark 975 1467 A, 49.39m (162.0 ft)
west of a 2 m (6 ft) tall yellow bollard at the west edge of a concrete ramp
between a pair of wooden piers, 39.71 m (130.3 ft) east of bench mark 975 1467
C, 6.40 m (21.0 ft) north of the water's edge, and 0.25 m (0.8 ft) above the
stone beach.

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

                                                                                
Station ID: 9751467                         PUBLICATION DATE:  11/08/2011
Name:       LOVANGO CAY, ST JOHN                              
            VI
NOAA Chart: 25647                           Latitude:   18° 21.6' N (  18.36067)
USGS Quad:  Eastern St. Thomas              Longitude:  64° 48.2' W ( -64.80353)


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


                         BENCH MARK STAMPING:  1467 A 2011
                         DESIGNATION:          975 1467 A

MONUMENTATION:           Bench Mark disk                       VM#:        20004
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete ramp                         OPUS PID:        
LATITUDE:   18° 21.7' N (  18.36092)          LONGITUDE:  64° 48.2' W ( -64.80342)


The bench mark is a disk set near the west edge of a concrete ramp between a
pair of wooden piers, 49.59 m (162.7 ft) east of bench mark 975 1467 B, 20.70 m
(67.9 ft) west of a 2 m (6 ft) tall yellow bollard on the east side of the
concrete ramp, 5.82 m (19.1 ft) north of the first cleat on the western most of
the pair of wooden piers, 5.37 m (17.6 ft) south of a large tree which is just
north of the concrete ramp, 2.12 m (7.0 ft) north of the seaward extent of the
concrete ramp and the beginning of the western most of the two wooden piers, and
0.23 m (0.8 ft) east of the west edge of the concrete ramp.



                         BENCH MARK STAMPING:  1467 C 2011
                         DESIGNATION:          975 1467 C

MONUMENTATION:           Bench Mark disk                       VM#:        20005
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  In rock outcrop                       OPUS PID:        
LATITUDE:   18° 21.7' N (  18.36108)          LONGITUDE:  64° 48.3' W ( -64.80425)


The bench mark is a disk set in a low and flat section of bedrock outcrop at the
top of a stone beach, 41.51 m (136.1 ft) east of bench mark 975 1467 D, 39.71 m
(130.3 ft) west of bench mark 975 1467 B, 6.44 m (21.1 ft) north of the water's
edge, 1.11 m (3.6 ft) east of a 0.15 m (0.5 ft) diameter tree that is 3 m (10
ft) tall, and 0.09 m (0.3 ft) above the stone beach.

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

                                                                                
Station ID: 9751467                         PUBLICATION DATE:  11/08/2011
Name:       LOVANGO CAY, ST JOHN                              
            VI
NOAA Chart: 25647                           Latitude:   18° 21.6' N (  18.36067)
USGS Quad:  Eastern St. Thomas              Longitude:  64° 48.2' W ( -64.80353)


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


                         BENCH MARK STAMPING:  1467 D 2011
                         DESIGNATION:          975 1467 D

MONUMENTATION:           Bench Mark disk                       VM#:        20006
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  In rock outcrop                       OPUS PID:        
LATITUDE:   18° 21.7' N (  18.36108)          LONGITUDE:  64° 48.3' W ( -64.80464)


The bench mark is a disk set at the base of the last bedrock outcrop west of the
twin wooden piers, 110.7 m (363 ft) east of the east edge of a sand driveway
with posted no trespassing sign, 41.51m (136.2 ft) west of bench mark 975 1467
C, 12.18m (40.0 ft) west from the highest point of a 1.2 m (4 ft) square
boulder, 5.20 m (17.1 ft) north from the water's edge, and level with the stone
and gravel beach.



                         BENCH MARK STAMPING:  1467 E 2011
                         DESIGNATION:          975 1467 E

MONUMENTATION:           Bench Mark disk                       VM#:        20007
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete slab                         OPUS PID:        
LATITUDE:   18° 21.6' N (  18.36083)          LONGITUDE:  64° 48.2' W ( -64.80269)


The bench mark is a disk set in the SW corner of 2.36 m (7.7 ft) by 1.15 m (3.8
ft) concrete slab, 20.85 m (68.4 ft) ENE from the top center of a 1.5 m (5 ft)
tall elephant statue in a garden, 14.99 m (49.2 ft) NE from a large almacigo
tree, 10.98 m (36.0 ft) north from the NW corner of a 0.85m (2.8 ft) high wood
deck attached to a house, 7.70 m (25.3 ft) WSW from the SW corner of a utility
shed, 3.22 m (10.6 ft) north of the centerline of a single lane gravel drive,
and level with the surrounding lawn.

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

                                                                                
Station ID: 9751467                         PUBLICATION DATE:  11/08/2011
Name:       LOVANGO CAY, ST JOHN                              
            VI
NOAA Chart: 25647                           Latitude:   18° 21.6' N (  18.36067)
USGS Quad:  Eastern St. Thomas              Longitude:  64° 48.2' W ( -64.80353)


                            T I D A L   D A T U M S 


Tidal datums at LOVANGO CAY, ST JOHN based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           May 2011 - July 2011
     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:

     MEAN HIGHER HIGH WATER                     MHHW   =  0.322
     MEAN HIGH WATER                            MHW    =  0.242
     MEAN SEA LEVEL                             MSL    =  0.151
     MEAN TIDE LEVEL                            MTL    =  0.150
     MEAN LOW WATER                             MLW    =  0.057
     MEAN LOWER LOW WATER                       MLLW   =  0.000



Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     1467 B 2011                                 1.619    1.377
     1467 A 2011                                 1.214    0.972
     1467 C 2011                                 1.587    1.345
     1467 D 2011                                 1.568    1.326
     1467 E 2011                                 1.734    1.492


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

                                                                                
Station ID: 9751467                         PUBLICATION DATE:  11/08/2011
Name:       LOVANGO CAY, ST JOHN                              
            VI
NOAA Chart: 25647                           Latitude:   18° 21.6' N (  18.36067)
USGS Quad:  Eastern St. Thomas              Longitude:  64° 48.2' W ( -64.80353)


                             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 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 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.

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Products available at 9751467 Lovango Cay, St. John, VI

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services