Published Bench Mark Sheet for 8570255 9TH STREET, OCEAN CITY, ISLE OF WIGHT BAY MARYLAND
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 06/22/1982
Station ID: 8570255 SUPERCEDED DATE: 04/21/2003
Name: 9TH STREET, OCEAN CITY, ISLE OF WIGHT BAY
MARYLAND
NOAA Chart: 12211 Latitude: 38° 20.5' N
USGS Quad: OCEAN CITY Longitude: 75° 5.1' W
To reach the tidal bench marks in Ocean City from the intersection of Route 50
and Philadelphia Avenue, proceed north on Philadelphia Avenue to the
intersection of Philadelphia Avenue and 9th Street, turn left (east) onto 9th
Street to the intersection of 9th Street and Edgewater Avenue. The tide gage
and staff were located on the most southerly wooden pier on the western edge of
the property at 901 Edgewater Avenue, just north of 9th Street.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: C 104 RESET 1976
MONUMENTATION: Survey Disk VM#: 3020
AGENCY: PID#: HU1172
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set flush on the concrete foundation of the center support of
the water tower between 14th Street and 15 Streets and between St. Louis Avenue
and Philadelphia Avenue, and 1 foot (0.3 m) west of the eastern corner of the
foundation.
BENCH MARK STAMPING: 0255 A
MONUMENTATION: Survey Disk VM#: 3015
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Storm Drain
The bench mark is set flush in the east side of a concrete storm drain, 45 feet
(13.7 m) southeast of the southeastern corner of the wooden 2-story house at 901
Edgewater Avenue, 29 feet (8.8 m) northwest of the intersection of 9th Street
and Edgewater Avenue, 13 feet (4.0 m) north of the centerline of 9th Street, 10
feet (3.0 m) north of the wooden city pier and 8 feet (2.4 m) east of the
bulkhead.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 06/22/1982
Station ID: 8570255 SUPERCEDED DATE: 04/21/2003
Name: 9TH STREET, OCEAN CITY, ISLE OF WIGHT BAY
MARYLAND
NOAA Chart: 12211 Latitude: 38° 20.5' N
USGS Quad: OCEAN CITY Longitude: 75° 5.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0255 C 1978
MONUMENTATION: Survey Disk VM#: 3016
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Floor
The bench mark is set in concrete on the east side of the Ocean City Volunteer
Fire Company Headquarters between the 1st and 2nd doors from the north side of
the building, 72.0 feet ((21.9 m) south of 15th Street, 67.5 feet (20.6 m) west
of the centerline of Philadelphia Avenue, and 11.5 feet (3.51 m) north of the
centerline of the center door of Volunteer Fire Company Headquarters.
BENCH MARK STAMPING: 0255 D 1978
MONUMENTATION: Survey Disk VM#: 3017
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Porch
The bench mark is set in a concrete porch on the west side of pumping station N0
2, on 15th Street, 81.6 feet (24.9 m) east of the centerline of St. Louis
Avenue, 44.0 feet (13.4 m) south of the centerline of 15th Street and 1.9 feet
(0.58 m) above ground level.
BENCH MARK STAMPING: 0255 E 1978
MONUMENTATION: Survey Disk VM#: 3018
AGENCY: PID:
SETTING CLASSIFICATION: Concrete
The bench mark is set in concrete at the west entrance to the Water Department
Filtration Plant, 145.0 feet (44.2 m) north of the centerline of 14th Street,
51.4 feet (15.7 m) south of the westernmost water tower support, 16.5 feet (5.0
m) east of the centerline of Dayton Lane and at street level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 06/22/1982
Station ID: 8570255 SUPERCEDED DATE: 04/21/2003
Name: 9TH STREET, OCEAN CITY, ISLE OF WIGHT BAY
MARYLAND
NOAA Chart: 12211 Latitude: 38° 20.5' N
USGS Quad: OCEAN CITY Longitude: 75° 5.1' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: C 104 1962
MONUMENTATION: Survey Disk VM#: 3019
AGENCY: PID#: HU0369
SETTING CLASSIFICATION: Concrete Foundation
The bench mark is set in a drill hole in the northeast corner of the concrete
foundation of the northeast leg of a water tank, between 15th Street and 16
Street, 32 feet (9.8 m) west of the west curb of Philadelphia Avenue and about
level with the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 06/22/1982
Station ID: 8570255 SUPERCEDED DATE: 04/21/2003
Name: 9TH STREET, OCEAN CITY, ISLE OF WIGHT BAY
MARYLAND
NOAA Chart: 12211 Latitude: 38° 20.5' N
USGS Quad: OCEAN CITY Longitude: 75° 5.1' W
T I D A L D A T U M S
Tidal datums at 9TH STREET, OCEAN CITY, ISLE OF WIGHT BAY based on:
LENGTH OF SERIES: 22 MONTHS
TIME PERIOD: JUNE 1977-MAY 1979
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8638610 HAMPTON ROADS
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (10/14/1977) = 4.05
MEAN HIGHER HIGH WATER (MHHW) = 1.86
MEAN HIGH WATER (MHW) = 1.68
MEAN TIDE LEVEL (MTL) = 0.91
MEAN LOW WATER (MLW) = 0.13
MEAN LOWER LOW WATER (MLLW) = 0.00
LOWEST OBSERVED WATER LEVEL (01/11/1978) = -3.52
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
C 104 RESET 1976 8.50 6.82
0255 A 2.86 1.18
0255 C 1978 6.64 4.96
0255 D 1978 8.37 6.69
0255 E 1978 6.72 5.04
C 104 1962 6.64 4.96
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 06/22/1982
Station ID: 8570255 SUPERCEDED DATE: 04/21/2003
Name: 9TH STREET, OCEAN CITY, ISLE OF WIGHT BAY
MARYLAND
NOAA Chart: 12211 Latitude: 38° 20.5' N
USGS Quad: OCEAN CITY Longitude: 75° 5.1' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.
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