U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 7
PUBLICATION DATE: 10/28/1985
Station ID: 8577330 SUPERCEDED DATE: 04/21/2003
Name: SOLOMONS ISLAND, PATUXENT RIVER
MARYLAND
NOAA Chart: 12230 Latitude: 38° 19.0' N
USGS Quad: SOLOMONS ISLAND Longitude: 76° 27.2' W
To reach the tidal bench marks from State Highway 214 in Calvert County, proceed
south towards Solomons, bear left at the highway split, continue south on
Highway 2 for 1.4 miles (2.3 km) to the Chesapeake Biological Laboratory Pier on
the left. The bench marks are within 1 mile (1.6 km) radius of the tide gage.
The tide gage and staff are located on the pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7330 E 1980
MONUMENTATION: Survey Disk VM#: 455
AGENCY: PID#: AJ8036
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is located near the entrance of Solomons Marina, 35.0 feet (10.7
m) SE of the centerline of the entrance to the marina, 21.1 feet (6.4 m) NNE of
the centerline of Charles Street, 3.6 feet (1.1 m) south of Solomons Marina
sign, and 3.3 feet (1.0 m) NW of the chain-link fence around the boat storage
yard. The bench mark is 0.1 foot (0.03 m) below ground level, crimped to a
galvanized steel rod driven 40 feet (12 m) to refusal, and encased in a 5-inch
PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7330 A 1978
MONUMENTATION: Survey Disk VM#: 447
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is located in the Chesapeake Biological Laboratory compound near
the NW wall of R.V. Truitt Controlled Environment Laboratory, 42.6 feet (13.0 m)
SE of the centerline of Williams Street, 22.0 feet (6.7 m) NNE of the SW corner
of the Environmental Laboratory, 5.6 feet (1.7 m) south of the SW corner of the
main entrance to the laboratory, and 4.1 feet (1.2 m) NW of the NW wall of the
laboratory. The bench mark is 0.3 foot (0.1 m) below ground level, crimped to a
stainless steel rod driven 54 feet (16 m) to refusal, and encased in a 4-inch
PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 7
PUBLICATION DATE: 10/28/1985
Station ID: 8577330 SUPERCEDED DATE: 04/21/2003
Name: SOLOMONS ISLAND, PATUXENT RIVER
MARYLAND
NOAA Chart: 12230 Latitude: 38° 19.0' N
USGS Quad: SOLOMONS ISLAND Longitude: 76° 27.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1937
MONUMENTATION: Survey Disk VM#: 448
AGENCY: PID#: HV0365
SETTING CLASSIFICATION: Concrete Step
The bench mark is located at the front entrance of the Chesapeake Biological
Laboratory, 80.8 feet (26.6 m) east of the SW corner of the building, 80.4 feet
(24.5 m) south of the SE corner of the building, and 18.6 feet (5.7 m) NW of the
centerline of Farren Avenue. The bench mark is set in the lowest concrete step
of the walk leading to the entrance, 0.2 foot (0.1 m) above ground level.
BENCH MARK STAMPING: NO 5 1937
MONUMENTATION: Survey Disk VM#: 449
AGENCY: PID#: HV0367
SETTING CLASSIFICATION: Concrete Step
The bench mark is located at the NW side of the Chesapeake Biological Labo-
ratory, approximately 30.5 feet (9.3 m) SW of the north corner of the building,
6.8 feet (2.0 m) NE of the NE edge of the concrete steps, and 3 feet (1 m) NW of
the NW wall of the building. The bench mark is set flush in the north corner of
the top step leading to the basement.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 7
PUBLICATION DATE: 10/28/1985
Station ID: 8577330 SUPERCEDED DATE: 04/21/2003
Name: SOLOMONS ISLAND, PATUXENT RIVER
MARYLAND
NOAA Chart: 12230 Latitude: 38° 19.0' N
USGS Quad: SOLOMONS ISLAND Longitude: 76° 27.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 10 1946
MONUMENTATION: Survey Disk VM#: 450
AGENCY: PID#: HV0371
SETTING CLASSIFICATION: Concrete Step
The bench mark is located in the Chesapeake Biological Laboratory compound at
the north entrance to Nice Hall, 38.4 feet (11.7 m) WNW of the west corner of
1960 Biological Laboratory, 22.0 feet (6.7 m) ESE of the NW corner of Nice Hall,
9.2 feet (2.8 m) SW of NE edge of the sidewalk leading to the NE entrance of
Nice Hall, and 0.6 foot (0.2 m) above ground level, and set flush at the east
end of the second step of the entrance.
BENCH MARK STAMPING: NO 11 1963
MONUMENTATION: Survey Disk VM#: 451
AGENCY: PID#: HV0369
SETTING CLASSIFICATION: Concrete Apron
The bench mark is located in the Chesapeake Biological Laboratory compound at
the SW entrance of the Biological Laboratory (1960) building between Nice Hall
and the main building, 82.5 feet (25.1 m) east of Bench Mark 10 1946, 56.6 (17.3
m) NE of the center of the walkway surrounded by the laboratories, 45.3 feet
(13.8 m) SE of the west corner of the 1960 Biological Research Laboratory, 35.2
feet (10.7 m) NW of the SE corner of the 1960 Biological Laboratory, 5.8 feet
(1.7 m) ESE of the SW edge of steps leading to Research Laboratory, 0.7 foot
(0.2 m) above ground level. The bench mark is set flush in the NE corner of the
concrete apron that forms steps and entrance to the building.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 7
PUBLICATION DATE: 10/28/1985
Station ID: 8577330 SUPERCEDED DATE: 04/21/2003
Name: SOLOMONS ISLAND, PATUXENT RIVER
MARYLAND
NOAA Chart: 12230 Latitude: 38° 19.0' N
USGS Quad: SOLOMONS ISLAND Longitude: 76° 27.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7330 B 1978
MONUMENTATION: Survey Disk VM#: 452
AGENCY: PID:
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is located at the SW corner of the intersection of Charles Street
and Williams Street, 150.9 feet (46.0 m) SE of the centerline of Maltby Street,
46.1 feet (15.4 m) NE of the east corner of the CBL Center for En- vironmental &
Esturine Studies, University of Maryland, 20.1 feet (6.1 m) SW of the centerline
of Charles Street, 30.0 feet (9.1 m) WSW of the intersection of Charles and
Williams Streets, and 20.0 feet (6.1 m) NW of the centerline of Williams Street.
The bench mark is 0.1 foot (0.03 m) below ground level, crimped to a stainless
steel rod driven 33 feet (10 m) to refusal, and encased in a 4-inch PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: 7330 C 1979
MONUMENTATION: Survey Disk VM#: 453
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Wall
The bench mark is located at the north entrance to the Harbor Island Marina
Inc., 93.0 feet (28.3 m) SSE of the bulkhead at the Marina, 32.5 feet (9.9 m)
north of the entrance to the store, and 15.8 feet (4.8 m) south of the
centerline of Charles Street. The bench mark is on the east side of the step
leading to the marina, set flush with the wall, 1.4 feet (0.4 m) above ground
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 7
PUBLICATION DATE: 10/28/1985
Station ID: 8577330 SUPERCEDED DATE: 04/21/2003
Name: SOLOMONS ISLAND, PATUXENT RIVER
MARYLAND
NOAA Chart: 12230 Latitude: 38° 19.0' N
USGS Quad: SOLOMONS ISLAND Longitude: 76° 27.2' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7330 D 1980
MONUMENTATION: Survey Disk VM#: 454
AGENCY: PID:
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is located at the intersection of Charles Street and Patuxent
Avenue, 157.4 feet (48.0 m) NNE of power pole #44, 30.7 feet (9.4 m) east of the
centerline of Patuxent Avenue, 3.9 feet (1.2 m) west of the bulkhead, and 2.0
feet (0.6 m) east of the galvanized guard rail. The bench mark is 0.1 foot
(0.03 m) below ground level, crimped to a galvanized steel rod driven 30 feet (9
m) to refusal, and encased in a 5-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 7
PUBLICATION DATE: 10/28/1985
Station ID: 8577330 SUPERCEDED DATE: 04/21/2003
Name: SOLOMONS ISLAND, PATUXENT RIVER
MARYLAND
NOAA Chart: 12230 Latitude: 38° 19.0' N
USGS Quad: SOLOMONS ISLAND Longitude: 76° 27.2' W
T I D A L D A T U M S
Tidal datums at SOLOMONS ISLAND, PATUXENT RIVER based on:
LENGTH OF SERIES: 17 YEARS
TIME PERIOD: 1960-1978
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION:
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (08/13/1955) = 4.53
MEAN HIGHER HIGH WATER MHHW = 1.51
MEAN HIGH WATER MHW = 1.35
MEAN TIDE LEVEL MTL = 0.76
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 0.35
MEAN LOW WATER MLW = 0.17
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (12/31/1962) = -3.47
* NGVD reference based on elevations published in Quad 380762, 1982, and NOS
leveling of 1984.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
7330 E 1980 11.20 9.85
7330 A 1978 13.55 12.20
NO 4 1937 10.40 9.05
NO 5 1937 15.09 13.74
10 1946 14.61 13.26
NO 11 1963 15.54 14.19
7330 B 1978 13.16 11.81
7330 C 1979 7.95 6.60
7330 D 1980 7.82 6.47
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 7
PUBLICATION DATE: 10/28/1985
Station ID: 8577330 SUPERCEDED DATE: 04/21/2003
Name: SOLOMONS ISLAND, PATUXENT RIVER
MARYLAND
NOAA Chart: 12230 Latitude: 38° 19.0' N
USGS Quad: SOLOMONS ISLAND Longitude: 76° 27.2' W
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 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.