U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
PUBLICATION DATE: 11/29/1989
Station ID: 9751639 SUPERCEDED DATE: 04/21/2003
Name: CHARLOTTE AMALIE, ST. THOMAS, LONG BAY
VIRGIN ISLANDS
NOAA Chart: 25649 Latitude: 18° 20.1' N
USGS Quad: CENTRAL ST. THOMAS Longitude: 64° 55.2' W
To reach the tidal bench marks from the Harry S. Truman Airport on St. Thomas,
take Airport Road to Highway 30, proceed on Highway 30 east to Charlotte Amalie,
continue on Highway 30 past U.S. Coast Guard Dock at Kings Wharf to the
Havensight Mall and West Indian Cruise Ship Dock (about 3.5 miles (5.6 km) from
Airport Road). The bench marks are on the West Indian Dock compound, along
Highway 30, and on the U.S. Coast Guard compound. The tide station is at the NE
end of the West Indian Dock compound at the base of a small wooden pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1639 F 1983
MONUMENTATION: Survey Disk VM#: 1372
AGENCY: PID#: DL3908
SETTING CLASSIFICATION: Concrete Base
The bench mark is set flush in the east corner of a 6 x 8-foot (2 x 2 m)
concrete mooring bit base on the West Indian Dock compound, 82.2 feet (25.1 m)
west of the concrete block wall of the Yacht Haven parking lot, 38.4 feet (11.7
m) north of the north face of a cargo loading ramp, 17.0 feet (5.2 m) east of
the west face of the concrete bulkhead, and 2.0 feet (0.6 m) above the pier
deck.
BENCH MARK STAMPING: NO 2 1975
MONUMENTATION: Survey Disk VM#: 1374
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Pier
The bench mark is set flush in the concrete pier at the U.S. Coast Guard
station, 250 feet (76 m) west of the SE corner of the pier, 90 feet (27 m) east
of the SW corner of the pier, 25.0 feet (7.6 m) south of the north pier face,
and 4.2 feet (1.3 m) east of the third mooring cleat.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
PUBLICATION DATE: 11/29/1989
Station ID: 9751639 SUPERCEDED DATE: 04/21/2003
Name: CHARLOTTE AMALIE, ST. THOMAS, LONG BAY
VIRGIN ISLANDS
NOAA Chart: 25649 Latitude: 18° 20.1' N
USGS Quad: CENTRAL ST. THOMAS Longitude: 64° 55.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 3 1975
MONUMENTATION: Survey Disk VM#: 1375
AGENCY: PID#: DL3911
SETTING CLASSIFICATION: Concrete Pad
The bench mark is set flush in a concrete pad at the U.S. Coast Guard station,
64.0 feet (19.5 m) west of the SW corner of a concrete paintlocker, 33.1 feet
(10.1 m) north of the south face of a stone bulkhead, 22.6 feet (6.9 m) south of
the SW corner of a garage, and 0.8 foot (0.2 m) NW of the SE corner of a
concrete apron.
BENCH MARK STAMPING: NO 4 1975
MONUMENTATION: Survey Disk VM#: 1376
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Wall
The bench mark is set flush in the top of a concrete wall of a quadrangle, 29.7
feet (9.1 m) SW of the SW corner of a concrete generator building, 25.5 feet
(7.8 m) SE of the SE corner of a garage, and 17.6 feet (5.4 m) north of the NW
corner of a 3-foot (1 m) high concrete retaining wall for fuel tanks.
BENCH MARK STAMPING: NO 5 1975
MONUMENTATION: Survey Disk VM#: 1377
AGENCY: PID#: DL3910
SETTING CLASSIFICATION: Concrete Step
The bench mark is flush in the SW corner of a concrete step at the entrance to
the main administration building at the U.S. Coast Guard station, 27.3 feet (8.3
m) east of the east curb of the road leading to the station, and 3.5 feet (1.1
m) west of the foundation.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
PUBLICATION DATE: 11/29/1989
Station ID: 9751639 SUPERCEDED DATE: 04/21/2003
Name: CHARLOTTE AMALIE, ST. THOMAS, LONG BAY
VIRGIN ISLANDS
NOAA Chart: 25649 Latitude: 18° 20.1' N
USGS Quad: CENTRAL ST. THOMAS Longitude: 64° 55.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1639 B 1980
MONUMENTATION: Survey Disk VM#: 1378
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Bulkhead
The bench mark is set flush in a concrete bulkhead near the intersection of
Highway 30 and Tolbad Gade, 55.4 feet (16.9 m) south of the most eastern of six
flag poles along the wharf, 29.4 feet (9.0 m) west of the west curb, 29.2 feet
(8.9 m) NW of a traffic light, and 1.8 feet (0.5 m) NW of a cleat at a curve in
the bulkhead.
BENCH MARK STAMPING: 1639 C 1980
MONUMENTATION: Survey Disk VM#: 1379
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Bulkhead
The bench mark is set flush in the concrete bulkhead across the street from
Barklays Bank on Highway 30, about 200 feet (61 m) west of Bench Mark 1639 B
1980, 30.8 feet (9.4 m) south of the south side of Veterans Drive (Highway 30),
1.7 feet (0.5 m) north of the bulkhead face, and directly in front of a 2-foot
(1 m) mooring cleat.
BENCH MARK STAMPING: 1639 D 1980
MONUMENTATION: Survey Disk VM#: 1380
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Bulkhead
The bench mark is set flush in the concrete bulkhead near the intersection of
Highway 30 and Trompeter Gade, about 280 feet (85 m) west of Bench Mark 1639 C
1980, 30.8 feet (9.4 m) south of the south side of Veterans Drive, 1.7 feet (0.5
m) north of the bulkhead face, and directly in front of a 2-foot (1 m) mooring
cleat.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
PUBLICATION DATE: 11/29/1989
Station ID: 9751639 SUPERCEDED DATE: 04/21/2003
Name: CHARLOTTE AMALIE, ST. THOMAS, LONG BAY
VIRGIN ISLANDS
NOAA Chart: 25649 Latitude: 18° 20.1' N
USGS Quad: CENTRAL ST. THOMAS Longitude: 64° 55.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1639 E 1980
MONUMENTATION: Survey Disk VM#: 1381
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Bulkhead
The bench mark is set flush in the concrete bulkhead near the intersection of
Highway 30 and Storetvaer Gade, about 280 feet (85 m) west of Bench Mark 1639 D
1980, 31.0 feet (9.4 m) south of the south side of Veterans Drive, and 1.7 feet
(0.5 m) north of the bulkhead face.
BENCH MARK STAMPING: 1639 G 1983
MONUMENTATION: Survey Disk VM#: 1382
AGENCY: PID#: DL3907
SETTING CLASSIFICATION: Concrete Bulkhead Cap
The bench mark is set flush in the concrete bulkhead cap on the West Indian Dock
compound, 87.9 feet (26.8 m) SW of the south corner of a concrete block wall of
the Yacht Haven parking lot, 22.3 feet (6.8 m) SE of the SE face of a concrete
cargo loading pier, and 3.5 feet (1.1 m) NE of the northeasternmost mooring
bollard.
BENCH MARK STAMPING: 1639 H 1983
MONUMENTATION: Survey Disk VM#: 1383
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Pad
The bench mark is set flush in a 1.4-foot (0.4 m) square concrete pad on the
west Indian Dock compound, 89.0 feet (27.1 m) east of the face of the wharf,
83.0 feet (25.3 m) NE of the north corner of Builders Emporium warehouse, and
25.0 feet (7.6 m) north of the west corner of a 12 x 40-foot (4 x 12 m)
corrugated tin shed.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
PUBLICATION DATE: 11/29/1989
Station ID: 9751639 SUPERCEDED DATE: 04/21/2003
Name: CHARLOTTE AMALIE, ST. THOMAS, LONG BAY
VIRGIN ISLANDS
NOAA Chart: 25649 Latitude: 18° 20.1' N
USGS Quad: CENTRAL ST. THOMAS Longitude: 64° 55.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1639 J 1983
MONUMENTATION: Survey Disk VM#: 1384
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Slab
The bench mark is set flush in a concrete walk beneath the steps at the main
entrance to the West Indian Dock administration building, 17.5 feet (5.3 m) NE
of the south corner of the administration building, 5.2 feet (1.6 m) NW of the
NW face of the stair landing, 4.5 feet (1.4 m) SE of the SE face of the
building, and 0.4 foot (0.1 m) NW of the bottom step.
BENCH MARK STAMPING: 1639 L 1986
MONUMENTATION: Survey Disk VM#: 1385
AGENCY: PID#: DL3909
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush in the top of a 1-foot (0.3 m) wide concrete
retaining wall extending from the south face of the salt water pumping station
on the south side of Highway 30, 37.2 feet (11.3 m) south of the NE corner of
the pumping station building, 8.3 feet (2.5 m) west of the west curb of the
highway, 3.7 feet (0.9 m) east of the SE corner of the building, and 2.3 feet
(0.7 m) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
PUBLICATION DATE: 11/29/1989
Station ID: 9751639 SUPERCEDED DATE: 04/21/2003
Name: CHARLOTTE AMALIE, ST. THOMAS, LONG BAY
VIRGIN ISLANDS
NOAA Chart: 25649 Latitude: 18° 20.1' N
USGS Quad: CENTRAL ST. THOMAS Longitude: 64° 55.2' W
T I D A L D A T U M S
Tidal datums at CHARLOTTE AMALIE, ST. THOMAS, LONG BAY based on:
LENGTH OF SERIES: 6 YEARS
TIME PERIOD: 1982-1987
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 9759110 MAGUEYES
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (09/18/1989) = 3.41
MEAN HIGHER HIGH WATER MHHW = 0.82
MEAN HIGH WATER MHW = 0.77
MEAN TIDE LEVEL MTL = 0.41
MEAN LOW WATER MLW = 0.06
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (02/06/1985) = -1.38
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
1639 F 1983 5.56 4.79
NO 2 1975 3.37 2.60
NO 3 1975 4.86 4.09
NO 4 1975 4.75 3.98
NO 5 1975 5.44 4.67
1639 B 1980 3.30 2.53
1639 C 1980 3.32 2.55
1639 D 1980 3.33 2.56
1639 E 1980 3.35 2.58
1639 G 1983 8.19 7.42
1639 H 1983 9.13 8.36
1639 J 1983 10.28 9.51
1639 L 1986 8.02 7.25
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
PUBLICATION DATE: 11/29/1989
Station ID: 9751639 SUPERCEDED DATE: 04/21/2003
Name: CHARLOTTE AMALIE, ST. THOMAS, LONG BAY
VIRGIN ISLANDS
NOAA Chart: 25649 Latitude: 18° 20.1' N
USGS Quad: CENTRAL ST. THOMAS Longitude: 64° 55.2' 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.