U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 9751389 PUBLICATION DATE: 08/09/2021
Name: SALT RIVER BAY
VI
NOAA Chart: 25641 Latitude: 17° 46.5' N ( 17.77533)
USGS Quad: CHRISTIANSTED Longitude: 64° 45.7' W ( -64.76233)
From the St Croix Marine Center in Christiansted, proceed 0.5 km (0.3 mi)
southwest on Mt Welcome Road to the intersection with East End Road, continue
straight onto Christiansted Bypass and proceed 9.8 km (6.1 mi) west through
several turns to the intersection with Northside Road, turn right and proceed
3.7 km (2.3 mi) north on Northside Road to intersection with North Shore Road
near a bridge over Salt River, turn left and proceed 2.4 km (1.5 mi) North to
Salt River Marina and an unnamed road on the right. The tide station is at the
west end of the marina. The bench marks are along the marina seawall and on the
rock outcrops along the unnamed road to the north and the rocky point 0.6 km
(0.4 mi) northeast of the marina.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: FLOOD MARK
DESIGNATION: 975 1389 Flood Mark
MONUMENTATION: Tidal Station disk VM#: 23723
AGENCY: USGS (Geological Survey) IDB PID:
SETTING CLASSIFICATION: Concrete seawall OPUS PID#: BBHC37
LATITUDE: 17° 46.5' N ( 17.77533) LONGITUDE: 64° 45.7' W ( -64.76233)
The primary bench mark is a disc set flush to the surface of a concrete seawall
that measuring 95 cm (37 inches) wide 50 cm (20 inches) thick and 15.5 cm (6
inches) long, 77.60 m (254.6 ft) SW of the SW most corner of the Leatherback
Brewing Company building, 60.55 m (198.7 ft) east of the centerline of a post
office lock box protected by yellow street bollards at the intersection of North
Shore Road, 15.50 m (50.9 ft) WSW of the NE most corner of the concrete seawall
the bench mark is set in and 1.64 m (5.4 ft) east of the NW most corner of Cane
Bay Dive Shop covered wooden structure.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 9751389 PUBLICATION DATE: 08/09/2021
Name: SALT RIVER BAY
VI
NOAA Chart: 25641 Latitude: 17° 46.5' N ( 17.77533)
USGS Quad: CHRISTIANSTED Longitude: 64° 45.7' W ( -64.76233)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1389 A 2020
DESIGNATION: 975 1389 A
MONUMENTATION: Tidal Station disk VM#: 23724
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete seawall OPUS PID:
LATITUDE: 17° 46.5' N ( 17.77453) LONGITUDE: 64° 45.6' W ( -64.76069)
The bench mark is a disc set flush to the surface of a concrete seawall
measuring 32 cm (13 inches) thick by 42 cm (17 inches) wide, 196 m (643.0 ft)
ESE of the SE most corner of the Cane Bay Dive Shop covered wooden structure,
79.87 m (262.0 ft) west of the Cra Ora canoe rental sign attached to a brown
wooden building, 78.23 m (256.7 ft) SSW of the SW most seaward corner of the
wooden dock in the Salt River Bay Marina and 21.25 m (69.7 ft) east of the
corner of the concrete seawall on the south side of Salt River Marina.
BENCH MARK STAMPING: 1389 B 2020
DESIGNATION: 975 1389 B
MONUMENTATION: Tidal Station disk VM#: 23725
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete seawall OPUS PID#: BBHC36
LATITUDE: 17° 46.5' N ( 17.77474) LONGITUDE: 64° 45.7' W ( -64.76144)
The bench mark is a disc set flush to the surface of a concrete seawall
measuring 32 cm (13 inches) thick by 42 cm (17 inches) wide, 177.1 m (581.0 ft)
ESE of the centerline of post office lockbox protected by yellow painted steel
bollards at the intersection of North Shore Road, 160.40 m (526.2 ft) WNW of Cra
Ora canoe rental sign attached to a brown wooden building, 59.86 m (196.4 ft)
WNW of the corner of a concrete seawall and 10.45 m (34.3 ft) NNE of the chain
link fence line on the south side of Marina Access Road.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 9751389 PUBLICATION DATE: 08/09/2021
Name: SALT RIVER BAY
VI
NOAA Chart: 25641 Latitude: 17° 46.5' N ( 17.77533)
USGS Quad: CHRISTIANSTED Longitude: 64° 45.7' W ( -64.76233)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1389 C 2020
DESIGNATION: 975 1389 C
MONUMENTATION: Tidal Station disk VM#: 23726
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 17° 46.5' N ( 17.77575) LONGITUDE: 64° 45.7' W ( -64.76139)
The bench mark is a disc set flush to the top of a bedrock roadcut on the north
side of the road bed, 55.12 m (180.8 ft) WSW of a wooden utility pole on the
south side of the road, 15.78 m (51.8 ft) NE of a wooden utility pole on the
south side of the road, 7.82 m (25.7 ft) north of the roadward edge of a metal
guardrail on the south side of the road and 1.75 m (5.7 ft) north of the
farthest edge of the pavement on the north side of the road adjacent to the
bench mark.
BENCH MARK STAMPING: 1389 D 2020
DESIGNATION: 975 1389 D
MONUMENTATION: Tidal Station disk VM#: 23727
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: OPUS PID:
LATITUDE: 17° 46.7' N ( 17.77906) LONGITUDE: 64° 45.5' W ( -64.75844)
The bench mark is a disc set in bedrock on the beach at the location of the
Columbus landing site, 360 m (1181.1 ft) ESE of the northernmost tower of a
large white two story building facing seaward on the hill, 304 m (997.4 ft) SE
of a rocky point projecting northward into the ocean, 247 m (810.4 ft) SE of the
NE most corner of a blue roof on a large white building at the toe of a hill and
5.95 m (19.5 ft) south of the approximate ocean water line.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 9751389 PUBLICATION DATE: 08/09/2021
Name: SALT RIVER BAY
VI
NOAA Chart: 25641 Latitude: 17° 46.5' N ( 17.77533)
USGS Quad: CHRISTIANSTED Longitude: 64° 45.7' W ( -64.76233)
T I D A L D A T U M S
Tidal datums at SALT RIVER BAY based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: January 2021 - March 2021
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9751364 CHRISTIANSTED, ST. CROIX ISLAND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.217
MEAN HIGH WATER MHW = 0.212
MEAN TIDE LEVEL MTL = 0.110
MEAN SEA LEVEL MSL = 0.110
Virgin Islands Vertical Datum of 2009 VIVD09 = 0.108
MEAN LOW WATER MLW = 0.009
MEAN LOWER LOW WATER MLLW = 0.000
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
FLOOD MARK 0.861 0.649
1389 A 2020 1.132 0.920
1389 B 2020 0.942 0.730
1389 C 2020 15.729 15.517
1389 D 2020 1.302 1.090
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 9751389 PUBLICATION DATE: 08/09/2021
Name: SALT RIVER BAY
VI
NOAA Chart: 25641 Latitude: 17° 46.5' N ( 17.77533)
USGS Quad: CHRISTIANSTED Longitude: 64° 45.7' W ( -64.76233)
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.