U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8574459 PUBLICATION DATE: 04/21/2003
Name: POND POINT (ABERDEEN P.G.), BUSH RIVER
MD
NOAA Chart: 12274 Latitude: 39° 23.3' N ( 39.38830)
USGS Quad: EDGEWOOD Longitude: 76° 15.3' W ( -76.25500)
To reach the tidal bench marks from the intersection of I-95 and Route 22 in
Aberdeen, proceed east on Route 22 for 4.8 km (3.0 mi) to the main gate of
Aberdeen Proving Grounds, continue on Route 22 (Harford Boulevard) for 1.4 km
(0.9 mi), then turn right on Maryland Boulevard and go 0.3 km (0.2 mi), then
turn left on Aberdeen Boulevard and go 2.3 km (1.4 mi) to a firehouse, bear left
at split in the road and continue 0.5 km (0.3 mi) to the AMSAA/ARL building on
the left. Pick up visitor's badges at the visitor's desk and proceed to the
UNDEX test pond with APG escort. The bench marks are located in the vicinity of
the test pond. The tide gage was located at the SW end of the concrete dock at
the barge basin.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4459 A 1995
DESIGNATION: 857 4459 A
MONUMENTATION: Tidal Station disk VM#: 13088
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete deck OPUS PID:
LATITUDE: 39° 23.3' N ( 39.38830) LONGITUDE: 76° 15.3' W ( -76.25500)
The primary bench mark is a disk set in the concrete deck at the west end of the
UNDEX barge basin, 8.56 m (28.1 ft) north of the SW corner of the dock, 1.86 m
(6.1 ft) SSE of the NW corner of the dock, and 0.30 m (1.0 ft) east of the west
face of the outer end of the dock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8574459 PUBLICATION DATE: 04/21/2003
Name: POND POINT (ABERDEEN P.G.), BUSH RIVER
MD
NOAA Chart: 12274 Latitude: 39° 23.3' N ( 39.38830)
USGS Quad: EDGEWOOD Longitude: 76° 15.3' W ( -76.25500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4459 B 1995
DESIGNATION: 857 4459 B
MONUMENTATION: Tidal Station disk VM#: 13089
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete deck OPUS PID:
LATITUDE: 39° 23.3' N ( 39.38830) LONGITUDE: 76° 15.3' W ( -76.25500)
The bench mark is a disk set in the concrete deck at the SE corner of the UNDEX
barge basin, 35 m (114 ft) south of the NE corner of the dock at the boat basin,
11 m (36 ft) north of the south edge of the concrete deck around the basin, and
0.30 m (1.0 ft) east of the west face of the inner end of the dock.
BENCH MARK STAMPING: 4459 C 1995
DESIGNATION: 857 4459 C
MONUMENTATION: Tidal Station disk VM#: 13090
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete deck OPUS PID:
LATITUDE: 39° 23.3' N ( 39.38830) LONGITUDE: 76° 15.3' W ( -76.25500)
The bench mark is a disk set in the concrete deck near the SE corner of the
wheelhouse of the UNDEX facility (between the boat basin and the test pond),
10.27 m (33.7 ft) ESE of the SW corner of the wheelhouse, 1.52 m (5.0 ft) south
of the SE corner of the wheelhouse, and 0.15 m (0.5 ft) south of the south face
of a concrete curb for a steel handrail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 6
Station ID: 8574459 PUBLICATION DATE: 04/21/2003
Name: POND POINT (ABERDEEN P.G.), BUSH RIVER
MD
NOAA Chart: 12274 Latitude: 39° 23.3' N ( 39.38830)
USGS Quad: EDGEWOOD Longitude: 76° 15.3' W ( -76.25500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4459 D 1995
DESIGNATION: 857 4459 D
MONUMENTATION: Tidal Station disk VM#: 13091
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete deck OPUS PID:
LATITUDE: 39° 23.3' N ( 39.38830) LONGITUDE: 76° 15.3' W ( -76.25500)
The bench mark is a disk set in the east end of the concrete deck at the west
end of the test pond, 18.38 m (60.3 ft) south of the inside corner of the
curbing at the NE corner of the deck, 10.09 m (33.1 ft) north of the SE corner
of the deck, and 0.30 m (1.0 ft) west of the east edge of the deck.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8574459 PUBLICATION DATE: 04/21/2003
Name: POND POINT (ABERDEEN P.G.), BUSH RIVER
MD
NOAA Chart: 12274 Latitude: 39° 23.3' N ( 39.38830)
USGS Quad: EDGEWOOD Longitude: 76° 15.3' W ( -76.25500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: M4512 LOT-1-87
DESIGNATION: 857 4459 UNDEX SOUTH
ALIAS: UNDEX SOUTH
MONUMENTATION: Cap-and-Bolt VM#: 13092
AGENCY: Unknown IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 39° 23.3' N ( 39.38830) LONGITUDE: 76° 15.3' W ( -76.25500)
The bench mark is a steel cap set in top of a concrete monument at the east end
of a berm to the south of the barge basin, 28 m (92 ft) south and uphill from
the south edge of a small pond, 20.03 m (65.7 ft) WSW of a power pole, 0.61 m
(2.0 ft) east of a black and white wooden witness post, and 0.03 m (0.1 ft)
above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8574459 PUBLICATION DATE: 04/21/2003
Name: POND POINT (ABERDEEN P.G.), BUSH RIVER
MD
NOAA Chart: 12274 Latitude: 39° 23.3' N ( 39.38830)
USGS Quad: EDGEWOOD Longitude: 76° 15.3' W ( -76.25500)
T I D A L D A T U M S
Tidal datums at POND POINT (ABERDEEN P.G.), BUSH RIVER based on:
LENGTH OF SERIES: 1 Month
TIME PERIOD: August 1995 - August 1995
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8574680 BALTIMORE, FORT MCHENRY, PATAPSCO RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.546
MEAN HIGH WATER MHW = 0.438
MEAN SEA LEVEL MSL = 0.269
MEAN TIDE LEVEL MTL = 0.248
MEAN LOW WATER MLW = 0.058
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4459 A 1995 1.690 1.252
4459 B 1995 1.710 1.272
4459 C 1995 1.595 1.157
4459 D 1995 1.722 1.284
M4512 LOT-1-87 8.951 8.513
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8574459 PUBLICATION DATE: 04/21/2003
Name: POND POINT (ABERDEEN P.G.), BUSH RIVER
MD
NOAA Chart: 12274 Latitude: 39° 23.3' N ( 39.38830)
USGS Quad: EDGEWOOD Longitude: 76° 15.3' W ( -76.25500)
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.