U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
Station ID: 9751381 PUBLICATION DATE: 02/16/2018
Name: LAMESHUR BAY, ST. JOHN
VI
NOAA Chart: 25641 Latitude: 18° 19.1' N ( 18.31825)
USGS Quad: WESTERN ST JOHN Longitude: 64° 43.5' W ( -64.72422)
To reach the benchmarks from the intersection of Highway 10 and Highway 107
South in Coral Bay, St John, USVI, proceed south and west on 107 South for 8.53
km (5.3 miles) to the end of the pavement, then proceed west on Lameshur Bay
Trail for 1.45 km (0.9 miles) to Yawzi Point Trail, turn left (south) and
proceed 0.16 km (0.1 miles) to the Lameshur Bay Research Lab. The water level
sensor is located on the south side of the pier . The benchmark are along the
gravel road and a rock outcropping.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1381 A 2006
DESIGNATION: 975 1381 A
MONUMENTATION: Tidal Station disk VM#: 18179
AGENCY: National Ocean Service (NOS) IDB PID#: DL3636
SETTING CLASSIFICATION: Concrete pad OPUS PID#: DL3636
LATITUDE: 18° 19.1' N ( 18.31828) LONGITUDE: 64° 43.5' W ( -64.72431)
The bench mark is a disk set in the NE corner of the concrete pad for a park
service sign at the foot of a wooden pier, located 26.35 m (86.5 ft) SSE of the
SE corner of the main lab building, 2.50 m (8.2 ft) WSW of the north end of the
pier, 2.40 m ( 7.87 ft) NW of the NOAA shelter, and 2.35 m (7.71 ft) south of a
concrete walkway leading to the pier.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
Station ID: 9751381 PUBLICATION DATE: 02/16/2018
Name: LAMESHUR BAY, ST. JOHN
VI
NOAA Chart: 25641 Latitude: 18° 19.1' N ( 18.31825)
USGS Quad: WESTERN ST JOHN Longitude: 64° 43.5' W ( -64.72422)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: BM 2 1967
DESIGNATION: 975 1381 TIDAL 2
MONUMENTATION: Survey disk VM#: 15008
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: DL3638
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 18° 19.1' N ( 18.31775) LONGITUDE: 64° 43.4' W ( -64.72417)
The bench mark is a disk set on a rocky outcrop to the south of the research
pier, located 60.96 m (200.0 ft) south of the pier, 26.45 m (86.78 ft) south of
BM 1381 C and 1.40 m (4.59 ft) west of the water's edge.
BENCH MARK STAMPING: BM 3 1967
DESIGNATION: 975 1381 TIDAL 3
MONUMENTATION: Survey disk VM#: 15009
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Crevice OPUS PID:
LATITUDE: 18° 19.1' N ( 18.31764) LONGITUDE: 64° 43.4' W ( -64.72414)
The bench mark is a disk set in a crevice on the first point visible from the
pier south of the Viers pier, and 76.20 m (250.0 ft) south of the pier, 10.80 m
(35.43 ft) north of BM 3, and 2.55 (8.37 ft) west of the water's edge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
Station ID: 9751381 PUBLICATION DATE: 02/16/2018
Name: LAMESHUR BAY, ST. JOHN
VI
NOAA Chart: 25641 Latitude: 18° 19.1' N ( 18.31825)
USGS Quad: WESTERN ST JOHN Longitude: 64° 43.5' W ( -64.72422)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1381 C 2007
DESIGNATION: 975 1381 C
MONUMENTATION: Tidal Station disk VM#: 18305
AGENCY: National Ocean Service (NOS) IDB PID#: DL3637
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 18° 19.1' N ( 18.31792) LONGITUDE: 64° 43.5' W ( -64.72428)
The benchmark is a disk set in a rock outcropping south of the pier, 26.10 m
(85.6 ft) south of the centerline of the Viers pier, 26.45 m (86.8 ft) north of
BM 2, 0.30 m (1.0 ft) west of the water's edge, and 0.55 m (1.8 ft) above the
water line.
BENCH MARK STAMPING: 1381 D 2015
DESIGNATION: 975 1381 D
MONUMENTATION: Survey disk VM#: 21468
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 18° 19.2' N ( 18.31942) LONGITUDE: 64° 43.5' W ( -64.72556)
The bench mark is a disk set in a rock outcrop on right hand side of foot path
leading toward Yawzi Point, 14.8m (48.6ft) W of approximate centerline of foot
path leading toward Yawzi Point, 1.0m (3.3ft) S of the edge of rock outcrop,
0.98m (3.2ft) E of W-most edge of rock outcrop on water's edge, and
approximately 0.5m (1.6ft) above ground, being the high point on a standard NOS
survey disk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
Station ID: 9751381 PUBLICATION DATE: 02/16/2018
Name: LAMESHUR BAY, ST. JOHN
VI
NOAA Chart: 25641 Latitude: 18° 19.1' N ( 18.31825)
USGS Quad: WESTERN ST JOHN Longitude: 64° 43.5' W ( -64.72422)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1381 E 2016
DESIGNATION: 975 1381 E
MONUMENTATION: Tidal Station disk VM#: 21872
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 18° 19.2' N ( 18.32019) LONGITUDE: 64° 43.5' W ( -64.72544)
The bench mark is a stainless steel rod set on a rise in the SW corner of dirt
road intersection going to Little Lameshure Bay to the right and Yawzi Point
Trail to the left, 7.2 m (23.6 ft) W of center of road leading to Yawzi Point
Trail, 4.7 m (15.4 ft) S of center of dirt road leading to Little Lamshure Bay
and 1.7 m (5.6 ft) SW of road direction sign. The deep rod is mark encased in 6
inch (15 cm) PVC pipe with logo cap, being 0.1 m (0.3 ft) above ground.
BENCH MARK STAMPING: 1381 F 2016
DESIGNATION: 975 1381 F
MONUMENTATION: Tidal Station disk VM#: 21873
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 18° 19.2' N ( 18.31947) LONGITUDE: 64° 43.5' W ( -64.72506)
The bench mark is a stainless steel rod set on the N side of last stretch of
dirt road leading to the gauge station, 33.5 m (109.9 ft) E of the power pole at
the Yawzi trailhead, 20.4 m (66.9 ft) W of the first power pole on left side of
dirt road leading to our station, 2.7 m (8.9 ft) NE of center of dirt road
leading to our station. The deep rod mark is encased in a 6 inch (15 cm) PVC
pipe with logo cap, being 0.15 m (0.5 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
Station ID: 9751381 PUBLICATION DATE: 02/16/2018
Name: LAMESHUR BAY, ST. JOHN
VI
NOAA Chart: 25641 Latitude: 18° 19.1' N ( 18.31825)
USGS Quad: WESTERN ST JOHN Longitude: 64° 43.5' W ( -64.72422)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1381 G 2016
DESIGNATION: 975 1381 G
MONUMENTATION: Tidal Station disk VM#: 21874
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pad OPUS PID:
LATITUDE: 18° 19.2' N ( 18.32047) LONGITUDE: 64° 43.6' W ( -64.72650)
The bench mark is a disk set in NW corner of a 4'x4' concrete pad, 40.8 m (133.9
ft) W of outhouse for Little Lameshur Bay Beach, 16 m (52.5 ft) N of a sign
bearing beach information and 8 m (26.2 ft) S of the center of dirt road.
BENCH MARK STAMPING: 1381 H 2016
DESIGNATION: 975 1381 H
MONUMENTATION: Survey disk VM#: 21875
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Rock outcrop OPUS PID:
LATITUDE: 18° 19.2' N ( 18.32061) LONGITUDE: 64° 43.6' W ( -64.72728)
The bench mark is a disk set flush in the ground at the end of dirt road leading
to Little Lameshur Bay at the top at the hill at entrance to parking lot, 26.1 m
(85.6 ft) NE of N face of chimney ruins, 16.7 m (54.8 ft) E of Lameshur Bay
trailhead sign, 4 m (13.1 ft) S of N edge of dirt road leading to Lameshur Bay
trail parking lot.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
Station ID: 9751381 PUBLICATION DATE: 02/16/2018
Name: LAMESHUR BAY, ST. JOHN
VI
NOAA Chart: 25641 Latitude: 18° 19.1' N ( 18.31825)
USGS Quad: WESTERN ST JOHN Longitude: 64° 43.5' W ( -64.72422)
T I D A L D A T U M S
Tidal datums at LAMESHUR BAY, ST. JOHN based on:
LENGTH OF SERIES: 9 YEARS
TIME PERIOD: 9/06-8/09, 9/10-8/12, 3/13-2/17
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:
HIGHEST OBSERVED WATER LEVEL (11/08/2017) = 0.639
MEAN HIGHER HIGH WATER MHHW = 0.252
MEAN HIGH WATER MHW = 0.237
MEAN TIDE LEVEL MTL = 0.127
MEAN SEA LEVEL MSL = 0.120
Virgin Islands Vertical Datum of 2009 VIVD09 = 0.114
MEAN LOW WATER MLW = 0.017
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/10/2009) = -0.190
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1381 A 2006 1.193 0.956
BM 2 1967 0.678 0.441
BM 3 1967 1.188 0.951
1381 C 2007 0.753 0.516
1381 D 2015 3.649 3.412
1381 E 2016 2.939 2.702
1381 F 2016 1.642 1.405
1381 G 2016 2.423 2.186
1381 H 2016 9.085 8.848
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
Station ID: 9751381 PUBLICATION DATE: 02/16/2018
Name: LAMESHUR BAY, ST. JOHN
VI
NOAA Chart: 25641 Latitude: 18° 19.1' N ( 18.31825)
USGS Quad: WESTERN ST JOHN Longitude: 64° 43.5' W ( -64.72422)
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.