U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9751472 PUBLICATION DATE: 08/06/2021
Name: ST. JOHN'S ISLAND, LITTLE CRUZ BAY
VI
NOAA Chart: 25647 Latitude: 18° 20.0' N ( 18.33292)
USGS Quad: Western St. John Longitude: 64° 47.6' W ( -64.79414)
To reach from the Virgin Islands National Park Visitor Center, on Cruz Bay, St.
John proceed west approximately 60 meters to the SE corner of the Caneel Bay
Fuel Dock and the station. The benchmarks are on the NPS seawall, the fuel dock,
and along Route 10 on the way out of Cruz Bay. The tide gauge is located near
the SE corner of the fuel dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1972
DESIGNATION: 975 1472 1
MONUMENTATION: Tidal Station disk VM#: 15017
AGENCY: National Ocean Survey (NOS) IDB PID#: DL3598
SETTING CLASSIFICATION: Concrete sea wall OPUS PID#: DL3598
LATITUDE: 18° 20.0' N ( 18.33258) LONGITUDE: 64° 47.6' W ( -64.79392)
The bench mark is a disk set in a massive seawall on the south side of the
visitor center, 67.72 m (222.2 ft) W of bench mark JACOB on the NE seawall at
Little Cruz Bay, 25.52 m (83.70 ft) WSW of the southwest corner of the steps to
the visitor center, 8.50 m (27.90 ft) SE of the southwest corner of the visitor
center, 0.40 m (1.30 ft) E of a bollard, and 0.26 m (0.90 ft) N of the south
edge of the seawall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9751472 PUBLICATION DATE: 08/06/2021
Name: ST. JOHN'S ISLAND, LITTLE CRUZ BAY
VI
NOAA Chart: 25647 Latitude: 18° 20.0' N ( 18.33292)
USGS Quad: Western St. John Longitude: 64° 47.6' W ( -64.79414)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1972
DESIGNATION: 975 1472 2
MONUMENTATION: Tidal Station disk VM#: 15018
AGENCY: National Ocean Survey (NOS) IDB PID#: DL3600
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 18° 20.0' N ( 18.33267) LONGITUDE: 64° 47.6' W ( -64.79333)
The bench mark is a disk set on the top of a massive seawall southeast of the
visitor center, 26.50 m (86.90 ft) NNW of the southeast corner of the seawall,
17.00 m (55.80 ft) SSE of the north angle of the seawall, 12.40 m (40.70 ft) NNW
of bench mark JACOB, 12.10 m (39.70 ft) NW of a flagpole, 0.40 m (1.30 ft) NNW
of the north edge of a concrete dock and 0.30 m (1.00 ft) NE of the west edge of
the seawall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9751472 PUBLICATION DATE: 08/06/2021
Name: ST. JOHN'S ISLAND, LITTLE CRUZ BAY
VI
NOAA Chart: 25647 Latitude: 18° 20.0' N ( 18.33292)
USGS Quad: Western St. John Longitude: 64° 47.6' W ( -64.79414)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: JACOB 2007
DESIGNATION: JACOB
MONUMENTATION: Horizontal Station disk VM#: 23547
AGENCY: National Geodetic Survey IDB PID#: DL3595
SETTING CLASSIFICATION: Seawall OPUS PID#: DL3595
LATITUDE: 18° 20.0' N ( 18.33253) LONGITUDE: 64° 47.6' W ( -64.79328)
The bench mark is a disk set in the top of the east seawall of the small boat
basin, 45.00 m (147.6 ft) SE of the most easterly corner of the visitor center,
14.63 m (48.00 ft) NNW of the SE corner of the seawall, 12.40 m (40.70 ft) SSE
of bench mark 975 1472 2, 9.25 m (30.30 ft) WSW of a flagpole, and 8.75 m (28.70
ft) W of the SW corner of the Virgin Islands National Park sign.
BENCH MARK STAMPING: 1472 A 2020
DESIGNATION: 975 1472 A
ALIAS: 1472 A
MONUMENTATION: Tidal Station disk VM#: 23548
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Pier OPUS PID:
LATITUDE: 18° 20.0' N ( 18.33294) LONGITUDE: 64° 47.7' W ( -64.79439)
The bench mark is a disk set at the SW corner of the Caneel Bay fuel dock, 54.10
m (177.5 ft) NW of the southeast corner of the Virgin Islands National Park
visitor center, 33.52 m (110.0 ft) WNW of the most NW angle point on the seawall
surrounding the visitor center, 1.70 m (5.60 ft) SW of the SW corner of a wooden
shed center, and 0.22 m (0.70 ft) NNE of the SW corner of the dock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9751472 PUBLICATION DATE: 08/06/2021
Name: ST. JOHN'S ISLAND, LITTLE CRUZ BAY
VI
NOAA Chart: 25647 Latitude: 18° 20.0' N ( 18.33292)
USGS Quad: Western St. John Longitude: 64° 47.6' W ( -64.79414)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: ALLEN
DESIGNATION: ALLEN 2007
MONUMENTATION: Vertical Control disk VM#: 23549
AGENCY: National Geodetic Survey IDB PID#: DL3602
SETTING CLASSIFICATION: Rock ledge OPUS PID#: DL3602
LATITUDE: 18° 19.9' N ( 18.33092) LONGITUDE: 64° 47.4' W ( -64.79022)
The bench mark is a disk set in a 0.6 m (2.0 ft) x 1.2 m (3.9 ft) rock outcrop,
24.00 m (78.70 ft) N of the centerline of the highway, 18.20 m (59.70 ft) NNW of
a utility pole, 16.60 m (54.50 ft) NW of a utility pole, 8.20 m (26.90 ft) S of
the center of a driveway, and 0.15 m (0.50 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9751472 PUBLICATION DATE: 08/06/2021
Name: ST. JOHN'S ISLAND, LITTLE CRUZ BAY
VI
NOAA Chart: 25647 Latitude: 18° 20.0' N ( 18.33292)
USGS Quad: Western St. John Longitude: 64° 47.6' W ( -64.79414)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: WALL
MONUMENTATION: Bench Mark disk VM#: 23550
AGENCY: US Coast Guard & Geodetic Survey IDB PID:
SETTING CLASSIFICATION: Wall OPUS PID:
LATITUDE: 18° 19.9' N ( 18.33192) LONGITUDE: 64° 47.7' W ( -64.79486)
The bench mark is a disk set on the top of a 1 m (3.3 ft) x 0.15 m (0.5 ft) wide
concrete wall surrounding government house, 18.65 m (61.20 ft) N of the
intersection of Henry Samuel Street and Strand Street, 4.75 m (15.60 ft) W of
the NW corner of a concrete building housing public bathrooms, 3.72 m (12.20 ft)
E of the centerline of Entrance Drive, 2.63 m (8.60 ft) W of a power pole, and
0.83 m (2.70 ft) E of the pillar on the east side of the entrance gate.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9751472 PUBLICATION DATE: 08/06/2021
Name: ST. JOHN'S ISLAND, LITTLE CRUZ BAY
VI
NOAA Chart: 25647 Latitude: 18° 20.0' N ( 18.33292)
USGS Quad: Western St. John Longitude: 64° 47.6' W ( -64.79414)
T I D A L D A T U M S
Tidal datums at ST. JOHN'S ISLAND, LITTLE CRUZ BAY based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: January 2021 - April 2021
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9752235 CULEBRA
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.295
MEAN HIGH WATER MHW = 0.254
Virgin Islands Vertical Datum of 2009 VIVD09 = 0.145
MEAN TIDE LEVEL MTL = 0.144
MEAN SEA LEVEL MSL = 0.141
MEAN LOW WATER MLW = 0.034
MEAN LOWER LOW WATER MLLW = 0.000
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 1 1972 1.005 0.751
NO 2 1972 0.941 0.687
JACOB 2007 0.959 0.705
1472 A 2020 1.301 1.047
ALLEN 45.004 44.750
WALL 3.182 2.928
Foot Notes:
Bench mark ALLEN is based on one differential leveling connection and does not
meet the quality control standards of the NOS. Therefore, caution should be used
when deriving elevations for this mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9751472 PUBLICATION DATE: 08/06/2021
Name: ST. JOHN'S ISLAND, LITTLE CRUZ BAY
VI
NOAA Chart: 25647 Latitude: 18° 20.0' N ( 18.33292)
USGS Quad: Western St. John Longitude: 64° 47.6' W ( -64.79414)
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.