U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8638017 PUBLICATION DATE: 01/04/2011
Name: MARAD (FORT EUSTIS)
VA
NOAA Chart: 12248 Latitude: 37° 8.3' N ( 37.13822)
USGS Quad: YORKTOWN Longitude: 76° 37.4' W ( -76.62275)
To reach the station from the Fort Eustis base headquarters, go1.4 km ( 0.9 mi)
SW along Washington boulevard, then 0.4 km (0.25 mi) NW along Taylor avenue,
then 1.4 km (0.9 mi) SW along Mulberry Island Road, then 0.6 km (0.4 mi) NW
along back river road, then 1.4 km (0.9 mi) SW along Harrison Road, to the
station straight ahead. The bench marks are located near the U.S. Maritime
Commision Facilities building.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 8017 B 2010
DESIGNATION: 863 8017 B
MONUMENTATION: Flange-encased Rod VM#: 19810
AGENCY: U.S. Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod in sleeve OPUS PID#: BBBZ69
LATITUDE: 37° 8.3' N ( 37.13903) LONGITUDE: 76° 37.3' W ( -76.62236)
The benchmark is a flange-encased rod located west of the parking area for
building 2612 and south of the perimeter fence, 17.52 m (57.5 ft) NW of the NW
corner of building 2612, 14.11 m (46.3 ft) north of the NW corner of concrete
pad-transformer M2130BK51, 13.80 m (45.3 ft) WSW of the west corner of generator
switch box, and 3.5 m (11.5 ft) south of angle point in perimeter fence. The
datum point being the top of a stainless steel rod driven 17 m (55.8 ft) to
refusal with concrete kick block and a 5-inch logo cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8638017 PUBLICATION DATE: 01/04/2011
Name: MARAD (FORT EUSTIS)
VA
NOAA Chart: 12248 Latitude: 37° 8.3' N ( 37.13822)
USGS Quad: YORKTOWN Longitude: 76° 37.4' W ( -76.62275)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8017 A 2010
DESIGNATION: 863 8017 A
MONUMENTATION: Tidal Station disk VM#: 19809
AGENCY: U.S. Army Corps of Engineers (USACE) IDB PID#:
SETTING CLASSIFICATION: Concrete Wall OPUS PID:
LATITUDE: 37° 8.3' N ( 37.13836) LONGITUDE: 76° 37.4' W ( -76.62292)
The benchmark is a disk set on the top of a 0.22 m (0.7 ft) high concrete wall
on the north edge of the pier on the concrete pier extending from the reserve
fleet administration building number 2606, 26.31 m (86.3 ft) SW of the NW corner
of building 2606, 18.60 m (61.0 ft) west of the SW corner of building 2606, 1.46
m (4.8 ft) south of the south face of a steel bulkhead, and 0.36 m (1.2 ft) east
of an aluminum lamp post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8638017 PUBLICATION DATE: 01/04/2011
Name: MARAD (FORT EUSTIS)
VA
NOAA Chart: 12248 Latitude: 37° 8.3' N ( 37.13822)
USGS Quad: YORKTOWN Longitude: 76° 37.4' W ( -76.62275)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: L 313 1952
DESIGNATION: L 313
MONUMENTATION: Tidal Station disk VM#: 19811
AGENCY: U.S. Corps of Engineers IDB PID#: GV0559
SETTING CLASSIFICATION: Concrete apron OPUS PID:
LATITUDE: 37° 8.3' N ( 37.13793) LONGITUDE: 76° 37.3' W ( -76.62202)
The benchmark is a disk set on the top of the SW corner of a concrete apron on
the west side of a drainage pit, 84.4 m (277 ft) south of the centerline of
Harrison Road, 33.2 m (109 ft) south of the SW corner of the office supply
building, 8.8 m (29 ft) SW of the SW corner of a garage, 12 m (39.5 ft) west of
a 38.1 cm (15 in) pine tree.
BENCH MARK STAMPING: RAD
DESIGNATION: 863 8017 RAD
MONUMENTATION: Bench Mark disk VM#: 19812
AGENCY: U.S. Corps of Engineers (USACOE) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 37° 8.3' N ( 37.13825) LONGITUDE: 76° 37.3' W ( -76.62230)
The benchmark is a disk set in a 1.5 m (4.9 ft) concrete monument, 11.61 m
(38.1 ft) SW of the MW corner of building 2607, 8.90 m (29.2 ft) NW of the SW
corner of building 2607, 7.05 m (23.1 ft) south of the SW corner of building
2614, and 6.96 m (22.8 ft) east of flagpole base.
BENCH MARK STAMPING: W 454 1971
DESIGNATION: W 454
MONUMENTATION: Tidal Station disk VM#: 19813
AGENCY: U.S. Army Corps of Engineer IDB PID#: GV0556
SETTING CLASSIFICATION: Metal rod with a base plate
buried/screwed OPUS PID:
LATITUDE: 37° 8.5' N ( 37.14235) LONGITUDE: 76° 37.1' W ( -76.61855)
The benchmark is a disk located 13.9 m (45.5 ft) SE of the center line of
Harrison Road, 13.7 m (45 ft) SW of the centerline of a dirt road, 17.1 m (56
ft) south of the center of the junction of Harrison Road and a dirt road,7.2 m
(23.5 ft) south of power line pole 26-1 bearing a transformer and breaker box,
3.5 m (11.5 ft) NW of a .30 m (1 ft) box elder tree, and 0.5 m (1.5 ft) SE of a
metal witness post. The bench mark is set 7 cm (0.2 ft)) below grade, crimped to
a 1.2 m (4 ft) copper coated steel rod attached to a metal base plate and
encased in a 6 inch concrete pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8638017 PUBLICATION DATE: 01/04/2011
Name: MARAD (FORT EUSTIS)
VA
NOAA Chart: 12248 Latitude: 37° 8.3' N ( 37.13822)
USGS Quad: YORKTOWN Longitude: 76° 37.4' W ( -76.62275)
T I D A L D A T U M S
Tidal datums at MARAD (FORT EUSTIS) based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: August 2010 - September 2010
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8638610 SEWELLS POINT, HAMPTON ROADS
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.769
MEAN HIGH WATER MHW = 0.715
MEAN SEA LEVEL MSL = 0.390
MEAN TIDE LEVEL MTL = 0.381
MEAN LOW WATER MLW = 0.047
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
8017 B 2010 2.266 1.551
8017 A 2010 1.958 1.243
L 313 1952 1.802 1.087
RAD 2.243 1.528
W 454 1971 2.574 1.859
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8638017 PUBLICATION DATE: 01/04/2011
Name: MARAD (FORT EUSTIS)
VA
NOAA Chart: 12248 Latitude: 37° 8.3' N ( 37.13822)
USGS Quad: YORKTOWN Longitude: 76° 37.4' W ( -76.62275)
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.