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National Ocean Service
Datums Page Page 1 of 8
Station ID: 9751364 PUBLICATION DATE: 11/06/2020
Name: CHRISTIANSTED, ST. CROIX ISLAND
VI
NOAA Chart: 25645 Latitude: 17° 44.9' N ( 17.74769)
USGS Quad: CHRISTIANSTED Longitude: 64° 41.9' W ( -64.69839)
To reach the station from downtown Christiansted take Northdside road east for
1.2 miles to Fort Street turn left and proceed to the docks in Gallows Bay.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1364 A 2006
DESIGNATION: 975 1364 A
MONUMENTATION: Tidal Station disk VM#: 18060
AGENCY: National Ocean Service (NOS) IDB PID#: DK7162
SETTING CLASSIFICATION: Concrete pier deck OPUS PID#: DK7162
LATITUDE: 17° 44.9' N ( 17.74772) LONGITUDE: 64° 41.9' W ( -64.69836)
The primary bench mark is set in a concrete pier deck of Gallows Bay Dock,
located 13.13 m (43.08 ft) NE of the first cleat west of the NE corner of the
dock, 5.95 m (19.52 ft) west of the Aquatrak well, 1.51 m (4.95 ft) SE of the
north face of the wharf, 0.50 m (1.64 ft) south of the northernmost bollard, and
0.31 m (1.02 ft) above wharf deck.
BENCH MARK STAMPING: 1364 F 2007
DESIGNATION: 975 1364 F
MONUMENTATION: Tidal Station disk VM#: 15046
AGENCY: National Ocean Survey (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete sidewalk OPUS PID#: BBGK47
LATITUDE: 17° 44.8' N ( 17.74586) LONGITUDE: 64° 41.9' W ( -64.69778)
The bench mark is a disk set flush in top of a concrete median strip, located at
the corner of Lobster Street and Green Street, 37.80 m (124.02 ft) west of the
centerline of Fort Street, 31.0 m (101.7 ft) SE of the most eastern entrance of
the parking lot along the shoreline, and 8.70 m (28.54 ft) north of the
centerline of Green Street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 9751364 PUBLICATION DATE: 11/06/2020
Name: CHRISTIANSTED, ST. CROIX ISLAND
VI
NOAA Chart: 25645 Latitude: 17° 44.9' N ( 17.74769)
USGS Quad: CHRISTIANSTED Longitude: 64° 41.9' W ( -64.69839)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1364 B 2006
DESIGNATION: 975 1364 B
MONUMENTATION: Tidal Station disk VM#: 18061
AGENCY: National Ocean Service (NOS) IDB PID#: DK7161
SETTING CLASSIFICATION: Concrete pier deck OPUS PID:
LATITUDE: 17° 44.8' N ( 17.74733) LONGITUDE: 64° 41.9' W ( -64.69892)
The bench mark is set near the north end of the Gallows Bay Dock, 8.79 m (28.84
ft) NE of the fifth cleat on the north side of the wharf, 8.60 m (28.22 ft) SW
of the fourth cleat from the NE corner of the wharf, 7.00 m (22.97 ft) NW of the
centerline of the northernmost pier, 0.36 m (1.18 ft) SE of the north face of
the wharf, and 0.31 m (1.02 ft) above the wharf deck.
BENCH MARK STAMPING: 1364 C 2006
DESIGNATION: 975 1364 C
MONUMENTATION: Tidal Station disk VM#: 18062
AGENCY: National Ocean Service (NOS) IDB PID#: DK7160
SETTING CLASSIFICATION: Concrete pier deck OPUS PID:
LATITUDE: 17° 44.8' N ( 17.74694) LONGITUDE: 64° 42.0' W ( -64.69925)
The bench mark is set in concrete near the west end of the northernmost pier at
the Gallows Bay Dock, 7.30 m (23.95 ft) SE of the centerline of the northernmost
pier, 5.13 m (16.83 ft) SW of the westernmost light pole near the SW corner of
the north pier, 2.15 m (7.05 ft) NE of the west end of the north pier, 1.07 m
(3.51 ft) east of bollard on SW corner of the north pier, 0.31 m (1.02 ft) above
the wharf deck.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 9751364 PUBLICATION DATE: 11/06/2020
Name: CHRISTIANSTED, ST. CROIX ISLAND
VI
NOAA Chart: 25645 Latitude: 17° 44.9' N ( 17.74769)
USGS Quad: CHRISTIANSTED Longitude: 64° 41.9' W ( -64.69839)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1364 D 2006
DESIGNATION: 975 1364 D
MONUMENTATION: Tidal Station disk VM#: 18063
AGENCY: National Ocean Service (NOS) IDB PID#: DK7163
SETTING CLASSIFICATION: Concrete pier deck OPUS PID:
LATITUDE: 17° 44.8' N ( 17.74714) LONGITUDE: 64° 41.9' W ( -64.69825)
The bench mark is set in a concrete pier deck located on the west side of the
Gallows Bay Dock, 23.65 m (77.59 ft) SW of the west face of the ware house just
inside the security gate, 4.46 m (14.63 ft) NNW of the centerline of a concrete
loading ramp along the west side of the wharf, 3.24 m (10.63 ft) south of a
bollard on the north side of the loading ramp, and 0.30 m (1.0 ft) NE of the
west face of the wharf.
BENCH MARK STAMPING: 1364 E 2006
DESIGNATION: 975 1364 E
MONUMENTATION: Tidal Station disk VM#: 18064
AGENCY: National Ocean Service (NOS) IDB PID#: DK7157
SETTING CLASSIFICATION: Concrete block OPUS PID#: DK7157
LATITUDE: 17° 44.8' N ( 17.74647) LONGITUDE: 64° 41.9' W ( -64.69800)
The bench mark is set in a concrete block near the SW corner of the Gallows Bay
Dock, 28.44 m (93.31 ft) WSW of the fence on the east side of the property, 0.65
m (2.13 ft) NE from the fence on the west side of the property, 0.50 m (1.64 ft)
NW of a light pole with the security camera near the SE corner of the property,
and 0.40 m (1.31 ft) above the wharf deck.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 9751364 PUBLICATION DATE: 11/06/2020
Name: CHRISTIANSTED, ST. CROIX ISLAND
VI
NOAA Chart: 25645 Latitude: 17° 44.9' N ( 17.74769)
USGS Quad: CHRISTIANSTED Longitude: 64° 41.9' W ( -64.69839)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1364 H 2012
DESIGNATION: 975 1364 H
MONUMENTATION: Survey disk VM#: 20355
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete base for building support OPUS PID:
LATITUDE: 17° 44.8' N ( 17.74633) LONGITUDE: 64° 41.8' W ( -64.69740)
Bench mark is set in a 0.6 m (2.0 ft) x 0.6 m (2.0 ft) concrete corner post,
22.34 m (73.3 ft) west-southwest of the northeast corner of the Marshall and
Sterling insurance building, 21.24 m (69.7 ft) east-northeast of the centerline
of Port Street, 15.56 m (51.0 ft) southeast of the southwest corner of a pink
concrete office building, 0.24 m (0.8 ft) above ground, being the high point of
a standard NOS survey disk.
BENCH MARK STAMPING: 1364 J 2012
DESIGNATION: 975 1364 J
MONUMENTATION: Survey disk VM#: 20356
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 17° 44.8' N ( 17.74650) LONGITUDE: 64° 41.8' W ( -64.69694)
Bench mark is 27.25 m (89.4 ft) east-northeast of the northeast corner of the
Marshall and Starling insurance building, 12.95 m (42.5 ft) southeast of a green
3 m (9.8 ft) x 1 m (3.3 ft) electrical box, 3.63 m (11.9 ft) west-northwest of
the northwest corner of the Bank of St Croix building, 0.36 m (1.2 ft) southeast
of the corner of the concrete pad/foundation, 0.41 m (1.3 ft) above ground,
being the high point of a standard NOS survey disk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 9751364 PUBLICATION DATE: 11/06/2020
Name: CHRISTIANSTED, ST. CROIX ISLAND
VI
NOAA Chart: 25645 Latitude: 17° 44.9' N ( 17.74769)
USGS Quad: CHRISTIANSTED Longitude: 64° 41.9' W ( -64.69839)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1364 K 2014
DESIGNATION: 975 1364 K
MONUMENTATION: Tidal Station disk VM#: 21251
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: concrete walkway OPUS PID:
LATITUDE: 17° 44.7' N ( 17.74553) LONGITUDE: 64° 41.8' W ( -64.69722)
The bench mark is a disk set in a concrete building foundation, 33.27m (109.2
ft) south of the northwest corner of the hardware store building, 8.99m (29.5
ft) east of the centerline of Fort Street, 3.0m (9.8 ft) north of southwest
corner of hardware building, and 0.35m (1.1 ft) west of western most wall of
building.
BENCH MARK STAMPING: 1364 M 2015
DESIGNATION: 975 1364 M
MONUMENTATION: Metal Rod VM#: 21330
AGENCY: National Ocean Service (NOS) IDB PID:
SETTING CLASSIFICATION: Flange encased rod OPUS PID:
LATITUDE: 17° 44.7' N ( 17.74583) LONGITUDE: 64° 41.9' W ( -64.69783)
The bench mark is a rod located 51.54 m (169.1 ft) west of the westerly corner
of hardware store concrete footing, 28.75 m (94.3 ft) east of the center of
access entry of asphalt parking lot bordering southwest corner of vipa port
authority gallows bay facility, and 17.8 m (58.4 ft) north of the westerly
corner of a 1.5 m (4.9 ft) tall concrete fence along the northern face of pink
concrete dwelling, driven 37 ft (11.3 m) to refusal, encased in a protective pvc
sleeve, surrounded by a concrete kick block, with an aluminum access tidal lid
with a witness post directly adjacent to the mark.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 9751364 PUBLICATION DATE: 11/06/2020
Name: CHRISTIANSTED, ST. CROIX ISLAND
VI
NOAA Chart: 25645 Latitude: 17° 44.9' N ( 17.74769)
USGS Quad: CHRISTIANSTED Longitude: 64° 41.9' W ( -64.69839)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1364 N 2017
DESIGNATION: 975 1364 N
MONUMENTATION: Metal Rod VM#: 22283
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 17° 44.7' N ( 17.74533) LONGITUDE: 64° 41.8' W ( -64.69622)
The bench mark is a stainless steel rod located 32.30 m (106.0 ft) west of a
telephone pole (1297 with three round transformers at the top, 5.65 m (18.5 ft)
south of the SW corner of a parking lot, and 1.55 m (5.1 ft) east of the east of
Midship Drive. The bench mark is driven 7.74 m (25.4 ft) into the ground to
refusal, encased in a protective PVC sleeve, surrounded by a concrete kick
block, with an aluminum access tidal lid.
BENCH MARK STAMPING: 1364 P 2017
DESIGNATION: 975 1364 P
MONUMENTATION: Metal Rod VM#: 22284
AGENCY: National Ocean Service IDB PID:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 17° 44.8' N ( 17.74722) LONGITUDE: 64° 41.9' W ( -64.69792)
The bench mark is located 21.07 m (69.1 ft) NE from the door of a guard shack,
1.62 m (5.3 ft) south from power meters on the side of a building, and 1.05 m
(3.4 ft) north of a black rail fence. The mark is a stainless steel rod driven
approximately 10.06 m (33.0 ft) to refusal, encased in a sleeve inside of a 5
inch PVC pipe with a logo cap located approximately 15 cm (6 inches) above the
ground, and surrounded by a concrete kick block.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 9751364 PUBLICATION DATE: 11/06/2020
Name: CHRISTIANSTED, ST. CROIX ISLAND
VI
NOAA Chart: 25645 Latitude: 17° 44.9' N ( 17.74769)
USGS Quad: CHRISTIANSTED Longitude: 64° 41.9' W ( -64.69839)
T I D A L D A T U M S
Tidal datums at CHRISTIANSTED, ST. CROIX ISLAND based on:
LENGTH OF SERIES: 10 YEARS
TIME PERIOD: 11/06-10/07,8/08-7/09,3/10-2/16,4/16-3/17,4/18-319
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 9751401 LIME TREE BAY, ST CROIX
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/20/2017) = 0.788
MEAN HIGHER HIGH WATER MHHW = 0.227
MEAN HIGH WATER MHW = 0.220
Virgin Islands Vertical Datum of 2009 VIVD09 = 0.121
MEAN SEA LEVEL MSL = 0.115
MEAN TIDE LEVEL MTL = 0.115
MEAN LOW WATER MLW = 0.011
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (04/28/2009) = -0.221
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1364 A 2006 1.748 1.528
1364 F 2007 1.356 1.136
1364 B 2006 1.740 1.520
1364 C 2006 1.774 1.554
1364 D 2006 0.842 0.622
1364 E 2006 1.002 0.782
1364 H 2012 1.695 1.475
1364 J 2012 2.087 1.867
1364 K 2014 2.091 1.871
1364 M 2015 1.086 0.866
1364 N 2017 2.279 2.059
1364 P 2017 1.121 0.901
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 9751364 PUBLICATION DATE: 11/06/2020
Name: CHRISTIANSTED, ST. CROIX ISLAND
VI
NOAA Chart: 25645 Latitude: 17° 44.9' N ( 17.74769)
USGS Quad: CHRISTIANSTED Longitude: 64° 41.9' W ( -64.69839)
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.