U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9751373 PUBLICATION DATE: 05/06/2003
Name: ST JOHN'S ISLAND, CORAL HARBOR
NOAA Chart: 25641 Latitude: 18° 20.9' N ( 18.34830)
USGS Quad: WESTERN ST JOHN Longitude: 64° 43.0' W ( -64.71670)
To reach the tidal bench marks from the US Post Office on King Street (State
Highway 105) in Cruz Bay, proceed NNE on King Street for 0.2 km (0.1 mi) to the
Y-intersection with North Shore Road (State Highway 20), the NE on North Shore
Road for approximately 0.2 km (0.1 mi) to the entrance to the National Park
Service (NPS) Headquarters. The bench marks are on NPS property and near Coral
Bay Fire Department. The tide gauge and staff were on the NPS wharf.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1373 A 1983
DESIGNATION: 975 1373 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 7929
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pier OPUS PID#: BBCB77
LATITUDE: 18° 20.9' N ( 18.34830) LONGITUDE: 64° 43.0' W ( -64.71670)
The primary bench mark is a disk set in the NW corner of the shore end of a
concrete pier immediately south of Redbeards Saloon, 0.27 m (0.9 ft) east of the
west edge of the wharf, and 0.27 m (0.9 ft) south of the north edge of the wharf
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9751373 PUBLICATION DATE: 05/06/2003
Name: ST JOHN'S ISLAND, CORAL HARBOR
NOAA Chart: 25641 Latitude: 18° 20.9' N ( 18.34830)
USGS Quad: WESTERN ST JOHN Longitude: 64° 43.0' W ( -64.71670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1373 B 1983
DESIGNATION: 975 1373 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 7930
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 18° 20.9' N ( 18.34830) LONGITUDE: 64° 43.0' W ( -64.71670)
The bench mark is a disk set in the NE concrete foundation of the US Public
Health Shelter located just east of Coral Bay Fire Department, 10.91 m (35.8 ft)
south of Centerline Road, 0.88 m (2.9 ft) west of the NE corner of the shelter,
and 0.27 m (0.9 ft) east of the steps on the north of the shelter.
BENCH MARK STAMPING: 1373 C 1983
DESIGNATION: 975 1373 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 7931
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete retaining wall OPUS PID:
LATITUDE: 18° 20.9' N ( 18.34830) LONGITUDE: 64° 43.0' W ( -64.71670)
The bench mark is a disk set in the concrete retaining wall of a concrete drain
on the west side of Coral Bay Fire Department, 3.38 m (11.1 ft) east of a chain
link fence around a school yard, and 2.47 m (8.1 ft) SW of the NW corner of the
Fire Department building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9751373 PUBLICATION DATE: 05/06/2003
Name: ST JOHN'S ISLAND, CORAL HARBOR
NOAA Chart: 25641 Latitude: 18° 20.9' N ( 18.34830)
USGS Quad: WESTERN ST JOHN Longitude: 64° 43.0' W ( -64.71670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 975 1373 NO STAMPING 1
MONUMENTATION: Tidal Station disk VM#: 7932
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 18° 20.9' N ( 18.34830) LONGITUDE: 64° 43.0' W ( -64.71670)
The bench mark is a disk set in a rock on the east side of a point about 101 m
(330 ft) west of the wharf, and 1.98 m (6.5 ft) inshore from the approximate
high water line. NOTE: The bench mark is historically known as 2 1924.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9751373 PUBLICATION DATE: 05/06/2003
Name: ST JOHN'S ISLAND, CORAL HARBOR
NOAA Chart: 25641 Latitude: 18° 20.9' N ( 18.34830)
USGS Quad: WESTERN ST JOHN Longitude: 64° 43.0' W ( -64.71670)
T I D A L D A T U M S
Tidal datums at ST JOHN'S ISLAND, CORAL HARBOR based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: March 1983 - May 1983
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 = 0.273
MEAN HIGH WATER MHW = 0.244
MEAN TIDE LEVEL MTL = 0.135
MEAN SEA LEVEL MSL = 0.130
MEAN LOW WATER MLW = 0.025
MEAN LOWER LOW WATER MLLW = 0.000
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1373 A 1983 0.525 0.281
1373 B 1983 4.662 4.418
1373 C 1983 5.550 5.306
975 1373 NO STAMPING 1 0.779 0.535
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9751373 PUBLICATION DATE: 05/06/2003
Name: ST JOHN'S ISLAND, CORAL HARBOR
NOAA Chart: 25641 Latitude: 18° 20.9' N ( 18.34830)
USGS Quad: WESTERN ST JOHN Longitude: 64° 43.0' W ( -64.71670)
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.