U.S. DEPARTMENT OF COMMERCE
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National Ocean Service
Datums Page Page 1 of 10
Station ID: 8637624 PUBLICATION DATE: 04/21/2003
Name: GLOUCESTER POINT, YORK RIVER
VA
NOAA Chart: 12241 Latitude: 37° 14.8' N ( 37.24670)
USGS Quad: POQUOSON WEST Longitude: 76° 30.0' W ( -76.50000)
To reach the tidal bench marks from the intersection of U.S. Highway 17 and
State Road 1206 in Gloucester Point, proceed east on State Road 1206 for 0.08 km
(0.05 mi) to State Road 1208, continue south on State Road 1208 for 0.5 km (0.3
mi) to the Virginia Institute of Marine Science (VIMS). The bench marks are on
the VIMS property. The tide gages and staff are located on the VIMS Laboratory
Pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7624 F 1979
DESIGNATION: 863 7624 F
MONUMENTATION: Tidal Station disk VM#: 502
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 37° 14.8' N ( 37.24670) LONGITUDE: 76° 30.1' W ( -76.50170)
The primary bench mark is a disk set in the SW corner of the concrete foundation
for a transformer located on the west side of Byrd Hall, 26.64 m (87.4 ft) north
of the sea wall, 3.08 m (10.1 ft) north of the entrance to the transformer unit
enclosure, 2.90 m (9.5 ft) west of the west face of the building, 0.46 m (1.5
ft) south of the SW corner of the transformer unit, and 0.12 m (0.4 ft) above
ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 10
Station ID: 8637624 PUBLICATION DATE: 04/21/2003
Name: GLOUCESTER POINT, YORK RIVER
VA
NOAA Chart: 12241 Latitude: 37° 14.8' N ( 37.24670)
USGS Quad: POQUOSON WEST Longitude: 76° 30.0' W ( -76.50000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1918
DESIGNATION: TIDAL 4 STA 54
MONUMENTATION: Tidal Station disk VM#: 504
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: GV0598
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 37° 14.9' N ( 37.24830) LONGITUDE: 76° 30.1' W ( -76.50170)
The bench mark is a disk set in the top of a concrete block located near Hoxton
Hall at the intersection of State Route1208 and Bank Street, 15.33 m (50.3 ft)
SE of utility pole number T580-1, 8.99 m (29.5 ft) NW of utility pole number
T6434, 8.10 m (26.6 ft) SW of the centerline of Bank Street, 4.94 m (16.2 ft)
north of the east corner of Hoxton Hall, 0.87 m (2.9 ft) NE of the NE face of
Hoxton Hall, and 0.03 m (0.10 ft) above ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 10
Station ID: 8637624 PUBLICATION DATE: 04/21/2003
Name: GLOUCESTER POINT, YORK RIVER
VA
NOAA Chart: 12241 Latitude: 37° 14.8' N ( 37.24670)
USGS Quad: POQUOSON WEST Longitude: 76° 30.0' W ( -76.50000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 9 1959
DESIGNATION: TIDAL 9 STA 54
MONUMENTATION: Tidal Station disk VM#: 505
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: GV0596
SETTING CLASSIFICATION: Flagpole foundation OPUS PID:
LATITUDE: 37° 14.9' N ( 37.24830) LONGITUDE: 76° 30.0' W ( -76.50000)
The bench mark is a disk set in the SW corner of the flagpole base near Maury
Hall, 20.40 m (66.93 ft) SE of the east corner of Brooke Hall, 16.50 m (54.13
ft) south of the center of the bay window on the SE side of Maury Hall, and 8.45
m (27.72 ft) west of the center of the top step leading to the marine culture
lab.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 10
Station ID: 8637624 PUBLICATION DATE: 04/21/2003
Name: GLOUCESTER POINT, YORK RIVER
VA
NOAA Chart: 12241 Latitude: 37° 14.8' N ( 37.24670)
USGS Quad: POQUOSON WEST Longitude: 76° 30.0' W ( -76.50000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: D 457 1971
DESIGNATION: D 457
MONUMENTATION: Bench Mark disk VM#: 506
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: GV0597
SETTING CLASSIFICATION: Building OPUS PID:
LATITUDE: 37° 14.9' N ( 37.24830) LONGITUDE: 76° 30.0' W ( -76.50000)
The bench mark is a disk set vertically in the NE face of the concrete and brick
wall of Byrd Hall, 89.9 m (295 ft) SE of the centerline of State Road 1208, 6.10
m (20.0 ft) NW of a concrete retaining wall along the NW bank of York River,
0.24 m (0.8 ft) NW of the SE corner of the building, and 1 m (4 ft) above the
sidewalk.
BENCH MARK STAMPING: NO 8 1950 RESET 1973
DESIGNATION: 863 7624 TIDAL 8 RESET
MONUMENTATION: Tidal Station disk VM#: 507
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#:
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 37° 14.9' N ( 37.24830) LONGITUDE: 76° 30.0' W ( -76.50000)
The bench mark is a disk set in top of concrete curbing which is part of the sea
wall near the VIMS Laboratory Pier, 15.80 m (51.8 ft) east of the SE corner of
Davis Hall, 7.13 m (23.4 ft) SW of the SW corner of the Marine Culture
Laboratory, 0.61 m (2.0 ft) west of NW end of the pier, and 0.21 m (0.7 ft)
above the driveway.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 10
Station ID: 8637624 PUBLICATION DATE: 04/21/2003
Name: GLOUCESTER POINT, YORK RIVER
VA
NOAA Chart: 12241 Latitude: 37° 14.8' N ( 37.24670)
USGS Quad: POQUOSON WEST Longitude: 76° 30.0' W ( -76.50000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7624 G 1979
DESIGNATION: 863 7624 G
MONUMENTATION: Tidal Station disk VM#: 508
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete step OPUS PID:
LATITUDE: 37° 14.8' N ( 37.24670) LONGITUDE: 76° 30.2' W ( -76.50330)
The bench mark is a disk set flush in the west corner of a concrete step at
Maury Hall, 17.31 m (56.8 ft) SW of the flagpole at Watermans Hall, 15.42 m
(50.6 ft) east of the NW corner of the building, 9.02 m (29.6 ft) west of the NE
corner of the building, and 0.15 m (0.5 ft) above ground.
BENCH MARK STAMPING: 7624 K 1980
DESIGNATION: 863 7624 K
MONUMENTATION: Tidal Station disk VM#: 509
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 37° 14.8' N ( 37.24670) LONGITUDE: 76° 30.0' W ( -76.50000)
The bench mark is a disk located in the median between State Road 1208 and State
Road 1203, 19.48 m (63.9 ft) SW of VEPCO brace pole #80630, 8.93 m (29.3 ft) SSE
of the centerline of State Road 1208, 6.28 m (20.6 ft) north of the centerline
of State Road 1203, and 0.94 m (3.1 ft) SSW of a fire hydrant. The bench mark
is 0.06 m (0.2 ft) below the ground, crimped to a galvanized steel rod driven
14.6 m (48 ft) to refusal, and is encased in a 4-inch PVC pipe with concrete
kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 10
Station ID: 8637624 PUBLICATION DATE: 04/21/2003
Name: GLOUCESTER POINT, YORK RIVER
VA
NOAA Chart: 12241 Latitude: 37° 14.8' N ( 37.24670)
USGS Quad: POQUOSON WEST Longitude: 76° 30.0' W ( -76.50000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: G 298 RESET 1981
DESIGNATION: G 298 RESET 1981
MONUMENTATION: Bench Mark disk VM#: 510
AGENCY: National Geodetic Survey (NGS) IDB PID#: GV3523
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 37° 14.8' N ( 37.24670) LONGITUDE: 76° 30.2' W ( -76.50330)
The bench mark is a disk set in a concrete monument located near the center of a
sand parking area at the south end of 1208 near the Coleman bridge, 58.00 m
(190.3 ft) NE of the north side of a metal fence along the river, 27.95 m (91.7
ft) SSW of the fourth support of the bridge, and 18.5 m (60.7 ft) SE of the SE
side of the third support for the bridge.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 10
Station ID: 8637624 PUBLICATION DATE: 04/21/2003
Name: GLOUCESTER POINT, YORK RIVER
VA
NOAA Chart: 12241 Latitude: 37° 14.8' N ( 37.24670)
USGS Quad: POQUOSON WEST Longitude: 76° 30.0' W ( -76.50000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: C 457 1971
DESIGNATION: C 457
MONUMENTATION: Bench Mark disk VM#: 16006
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: GV0595
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 37° 14.9' N ( 37.24830) LONGITUDE: 76° 30.0' W ( -76.50000)
The bench mark is a disk located between Chesapeake Bay Hall and Brooke Hall
near the center of a small grassy area bordered by a brick sidewalk and a paved
drive, 24.38 m (80.0 ft) west of the west corner of the Maury Hall Building,
20.70 m (67.9 ft) SE of the SE outside corner of the Chesapeake Bay Hall, 15.2 m
(50.0 ft) NNW of the north corner of Brooke Hall, 3.35 m (11.0 ft) SW of the SW
concrete curb of a narrow drive that leads to the VIMS Laboratory pier, 3.0 m
(10.0 ft) SE of the SE concrete curb of a paved parking area, and 1.22 m (4.0
ft) north of a tree with a triple trunk. The bench mark is 0.10 m (0.3 ft) below
ground, crimped to a copper-clad steel rod driven to a depth of 36.6 m (120 ft),
and encased by a 5-inch iron pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 10
Station ID: 8637624 PUBLICATION DATE: 04/21/2003
Name: GLOUCESTER POINT, YORK RIVER
VA
NOAA Chart: 12241 Latitude: 37° 14.8' N ( 37.24670)
USGS Quad: POQUOSON WEST Longitude: 76° 30.0' W ( -76.50000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7624 L 2001
DESIGNATION: 863 7624 L
MONUMENTATION: Tidal Station disk VM#: 16418
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Retaining wall OPUS PID#: BBDN48
LATITUDE: 37° 14.9' N ( 37.24830) LONGITUDE: 76° 30.0' W ( -76.50000)
The bench mark is a disk set in the return wing of a retaining wall east of
Watermans Hall, 36.70 m (120.4 ft) ENE of the south corner of the SE face of
Watermans Hall, 15.97 m (52.4 ft) SE of the NE corner of the SE face of
Watermans Hall, 15.05 m (49.4 ft) SW of the centerline of the brick steps that
lead to the beach, and 1.03 m (3.4 ft) NW of the south corner of the retaining
wall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 10
Station ID: 8637624 PUBLICATION DATE: 04/21/2003
Name: GLOUCESTER POINT, YORK RIVER
VA
NOAA Chart: 12241 Latitude: 37° 14.8' N ( 37.24670)
USGS Quad: POQUOSON WEST Longitude: 76° 30.0' W ( -76.50000)
T I D A L D A T U M S
Tidal datums at GLOUCESTER POINT, YORK RIVER based on:
LENGTH OF SERIES: 19 Years
TIME PERIOD: January 1983 - December 2001
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (03/07/1962) = 1.908
MEAN HIGHER HIGH WATER MHHW = 0.820
MEAN HIGH WATER MHW = 0.760
North American Vertical Datum NAVD88 = 0.487
MEAN TIDE LEVEL MTL = 0.398
MEAN SEA LEVEL MSL = 0.394
MEAN LOW WATER MLW = 0.035
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/31/1966) = -0.957
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7624 F 1979 3.417 2.657
NO 4 1918 10.160 9.400
NO 9 1959 9.305 8.546
D 457 1971 4.310 3.550
NO 8 1950 RESET 1973 3.637 2.877
7624 G 1979 10.004 9.244
7624 K 1980 10.657 9.897
G 298 RESET 1981 1.704 0.944
C 457 1971 8.732 7.972
7624 L 2001 3.722 2.963
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 10 of 10
Station ID: 8637624 PUBLICATION DATE: 04/21/2003
Name: GLOUCESTER POINT, YORK RIVER
VA
NOAA Chart: 12241 Latitude: 37° 14.8' N ( 37.24670)
USGS Quad: POQUOSON WEST Longitude: 76° 30.0' W ( -76.50000)
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 the fixed datums of North American Vertical Datum of 1988 (NAVD88).
NAVD88 is a fixed datum derived from a simultaneous, least squares, minimum
constraint adjustment of Canadian/Mexican/United States leveling observations.
Local mean sea level observed at Father Point/Rimouski, Canada was held fixed as
the single initial constraint. NAVD88 replaces NGVD29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD29 was originally derived from a general
adjustment of the first-order leveling networks of the U.S. and Canada after
holding mean sea level observed at 26 long term tide stations as fixed.
Numerous local and wide-spread adjustments have been made since establishment in
1929. Bench mark elevations relative to NGVD29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD88 and NGVD29 are fixed geodetic datums whose elevation relationships to
local MSL and other tidal datums may not be consistent from one location to
another.
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 NAVD88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD88 elevations.
The NAVD88 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, NAVD88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD88 elevations listed for
each bench mark in the NGS database.