U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 11/09/1990
Station ID: 9751540 SUPERCEDED DATE: 04/21/2003
Name: ST THOMAS, RED HOOK BAY
VIRGIN ISLANDS
NOAA Chart: 25647 Latitude: 18° 19.5' N
USGS Quad: EASTERN ST THOMAS Longitude: 64° 51.0' W
To reach the tidal bench marks from the intersection of Mafolic Road and Sugar
Estate Road (Route 38) in downtown Charlotte Amalie, proceed east on Route 38
(turns into Weymouth Reymer Highway) for 3 miles (5 km) to Turpentine Run Road
(Route 32), then SE on Route 32 for 1 mile (2 km) to Redhook Road (Route 32),
then east on Redhook Road for 1.5 miles (2.4 km) to the entrance to National
Park Service (NPS) Redhook Bay Park, continue into the park for 0.5 mile (0.8
km) to NPS Redhook Bay Visitors Station. The bench marks are near the visitors
station. The tide gage and staff were on the NPS pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1973
MONUMENTATION: Survey Disk VM#: 7933
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush in the center of the concrete foundation of the NPS
antenna tower, 21.7 feet (6.6 m) west of the SW corner of the NPS Visitors
Station building.
BENCH MARK STAMPING: NO 2 1973
MONUMENTATION: Survey Disk VM#: 7934
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush in the concrete foundation on the south side of the
NPS Visitors Station building, 37 feet (11 m) east of the south entrance to the
building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 11/09/1990
Station ID: 9751540 SUPERCEDED DATE: 04/21/2003
Name: ST THOMAS, RED HOOK BAY
VIRGIN ISLANDS
NOAA Chart: 25647 Latitude: 18° 19.5' N
USGS Quad: EASTERN ST THOMAS Longitude: 64° 51.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 3 1973
MONUMENTATION: Survey Disk VM#: 7935
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Footing
The bench mark is set flush in the concrete footing on the NW corner of the NPS
headquarters office building, 34 feet (10 m) from the entrance to the building.
BENCH MARK STAMPING: USDI 1 ELEV 2.82 NPS
MONUMENTATION: Survey Disk VM#: 7936
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush in the NE corner of the concrete bulkhead
foundation, 39 feet (12 m) NE of the NE corner of the NPS Visitors Station
building, and 1 foot (0.3 m) SW of the NE corner.
BENCH MARK STAMPING: USDI 2 ELEV 2.85 NPS
MONUMENTATION: Survey Disk VM#: 7937
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush in the concrete bulkhead foundation, 35.5 feet
(10.8 m) NE of the NW bulkhead corner, and 4 feet (1 m) SW of the foot of the
pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 11/09/1990
Station ID: 9751540 SUPERCEDED DATE: 04/21/2003
Name: ST THOMAS, RED HOOK BAY
VIRGIN ISLANDS
NOAA Chart: 25647 Latitude: 18° 19.5' N
USGS Quad: EASTERN ST THOMAS Longitude: 64° 51.0' W
T I D A L D A T U M S
Tidal datums at ST THOMAS, RED HOOK BAY based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: FEBRUARY-MARCH 1975
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 (11/12/1973) = 1.82
MEAN HIGHER HIGH WATER MHHW = 1.14
MEAN HIGH WATER MHW = 0.97
MEAN TIDE LEVEL MTL = 0.56
MEAN LOW WATER MLW = 0.15
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (02/04/1975) = -0.32
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 1 1973 3.55 2.58
NO 2 1973 3.36 2.39
NO 3 1973 7.63 6.66
USDI 1 ELEV 2.82 NPS 3.08 2.11
USDI 2 ELEV 2.85 NPS 3.10 2.13
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 11/09/1990
Station ID: 9751540 SUPERCEDED DATE: 04/21/2003
Name: ST THOMAS, RED HOOK BAY
VIRGIN ISLANDS
NOAA Chart: 25647 Latitude: 18° 19.5' N
USGS Quad: EASTERN ST THOMAS Longitude: 64° 51.0' 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.