U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 8
Station ID: 8570282 PUBLICATION DATE: 11/07/2003
Name: OCEAN CITY, ISLE OF WIGHT
MD
NOAA Chart: 12211 Latitude: 38° 19.9' N ( 38.33170)
USGS Quad: OCEAN CITY Longitude: 75° 5.4' W ( -75.09000)
To reach the tidal bench marks from the intersection of the Route 50 Bridge
(continued) and Philadelphia Avenue proceed south along Philadelphia Avenue to
Talbot Street then east (turn right) along Talbot Street to Isle of Wright Bay.
The bench marks are located in the vacinity of Talbot Bunting Marina. The tide
gage and staff were located at the Talbot Bunting Marina on the pier closest to
the south side of Talbot Street on Isle of Wright Bay.
T I D A L B E N C H M A R K S
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 8
Station ID: 8570282 PUBLICATION DATE: 11/07/2003
Name: OCEAN CITY, ISLE OF WIGHT
MD
NOAA Chart: 12211 Latitude: 38° 19.9' N ( 38.33170)
USGS Quad: OCEAN CITY Longitude: 75° 5.4' W ( -75.09000)
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 4 1929
DESIGNATION: TIDAL 4 STA 1
MONUMENTATION: Tidal Station disk VM#: 3024
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HU0268
SETTING CLASSIFICATION: Concrete curb OPUS PID:
LATITUDE: 38° 19.7' N ( 38.32830) LONGITUDE: 75° 5.3' W ( -75.08830)
The primary bench mark is a disk set near the inner edge of the SE corner of the
intersection of Somerset Street and Baltimore Avenue, and is slightly elevated
above the level of the sidewalk.
BENCH MARK STAMPING: NO 1 1975
DESIGNATION: 857 0282 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 3021
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pavement OPUS PID:
LATITUDE: 38° 19.8' N ( 38.33000) LONGITUDE: 75° 5.4' W ( -75.09000)
The bench mark is a disk set flush in a concrete pavement located at the east
end of Wicomico Street at the junction of the concrete amusement area and a
wooden fishing pier, 19.48 m (63.9 ft) south of the NE corner of the amusement
area, 10.30 m (33.8 ft) north of the SE corner of the concrete amusement area,
and 0.24 m (0.8 ft) west of the junction of the pier and the amusement area.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 8
Station ID: 8570282 PUBLICATION DATE: 11/07/2003
Name: OCEAN CITY, ISLE OF WIGHT
MD
NOAA Chart: 12211 Latitude: 38° 19.9' N ( 38.33170)
USGS Quad: OCEAN CITY Longitude: 75° 5.4' W ( -75.09000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 2 1975
DESIGNATION: 857 0282 TIDAL 2
MONUMENTATION: Tidal Station disk VM#: 3022
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete pavement OPUS PID:
LATITUDE: 38° 19.8' N ( 38.33000) LONGITUDE: 75° 5.4' W ( -75.09000)
The bench mark is a disk set flush in the sidewalk at the south side of Wicomico
Street, 41.15 m (135.0 ft) east of the centerline of Baltimore Avenue, 7.32 m
(24.0 ft) south of the centerline of Wicomico Street, 1.52 m (5.0 ft) east of
the NE corner of the Laff-In Lounge and Bar, and 0.21 m (0.7 ft) north of the
south edge of the sidewalk.
BENCH MARK STAMPING: NO 3 1975
DESIGNATION: 857 0282 TIDAL 3
MONUMENTATION: Tidal Station disk VM#: 3023
AGENCY: National Ocean Survey (NOS) IDB PID#: HU2732
SETTING CLASSIFICATION: Concrete pavement OPUS PID:
LATITUDE: 38° 19.8' N ( 38.33000) LONGITUDE: 75° 5.4' W ( -75.09000)
The bench mark is a disk set flush in the sidewalk at the intersection of St.
Louis Avenue and Dorchester Street, 9 m (30 ft) east of the centerline of St.
Louis Avenue, and 7.32 m (24 ft) north of the centerline of Dorchester Street.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 8
Station ID: 8570282 PUBLICATION DATE: 11/07/2003
Name: OCEAN CITY, ISLE OF WIGHT
MD
NOAA Chart: 12211 Latitude: 38° 19.9' N ( 38.33170)
USGS Quad: OCEAN CITY Longitude: 75° 5.4' W ( -75.09000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6 1931
DESIGNATION: TIDAL 6 STA 1
MONUMENTATION: Tidal Station disk VM#: 3025
AGENCY: National Ocean Survey (NOS) IDB PID#: HU0267
SETTING CLASSIFICATION: Concrete foundation OPUS PID:
LATITUDE: 38° 19.7' N ( 38.32830) LONGITUDE: 75° 5.2' W ( -75.08670)
The bench mark is a disk in a ledge of the concrete foundation of the brick
chimney near the NW corner of a four story frame building located on the south
side of Somerset Street, 36 m (118 ft) east of the east curb of Baltimore
Avenue, 6 m (20 ft) south of the south curb of Somerset Street, 0.23 m (0.8 ft)
from the north edge of the foundation, and 0.18 m (0.6 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 8
Station ID: 8570282 PUBLICATION DATE: 11/07/2003
Name: OCEAN CITY, ISLE OF WIGHT
MD
NOAA Chart: 12211 Latitude: 38° 19.9' N ( 38.33170)
USGS Quad: OCEAN CITY Longitude: 75° 5.4' W ( -75.09000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: E 104 1962
DESIGNATION: E 104
MONUMENTATION: Tidal Station disk VM#: 3026
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HU0367
SETTING CLASSIFICATION: Concrete banister OPUS PID:
LATITUDE: 38° 19.9' N ( 38.33170) LONGITUDE: 75° 5.3' W ( -75.08830)
The bench mark is a disk set vertically in the SE end of the SW concrete
banister of the approach to the U.S. Highway 50 bridge over the Sinepuxent Bay,
27 m (89 ft) NW of the centerline of Philadelphia Avenue, and 0.3 m (1 ft) above
ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 8
Station ID: 8570282 PUBLICATION DATE: 11/07/2003
Name: OCEAN CITY, ISLE OF WIGHT
MD
NOAA Chart: 12211 Latitude: 38° 19.9' N ( 38.33170)
USGS Quad: OCEAN CITY Longitude: 75° 5.4' W ( -75.09000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: F 104 1962
DESIGNATION: F 104
MONUMENTATION: Bench Mark disk VM#: 3027
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: HU0366
SETTING CLASSIFICATION: Building OPUS PID:
LATITUDE: 38° 19.8' N ( 38.33000) LONGITUDE: 75° 5.3' W ( -75.08830)
The bench mark is a disk set vertically in the NE brick wall at the north corner
of the Police Department building on the south side of Dorchester Street between
Baltimore Avenue and Philadelphia Avenue, 32 m (105 ft) SE of the SE curb of
Philadelphia Avenue, 2.29 m (7.5 ft) SW of the SW curb of Dorchester Street, and
0.61 m (2.0 ft) above the sidewalk.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 7 of 8
Station ID: 8570282 PUBLICATION DATE: 11/07/2003
Name: OCEAN CITY, ISLE OF WIGHT
MD
NOAA Chart: 12211 Latitude: 38° 19.9' N ( 38.33170)
USGS Quad: OCEAN CITY Longitude: 75° 5.4' W ( -75.09000)
T I D A L D A T U M S
Tidal datums at OCEAN CITY, ISLE OF WIGHT based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: January 1976 - December 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8557380 LEWES, FT. MILES
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (03/16/1976) = 1.113
MEAN HIGHER HIGH WATER MHHW = 0.784
MEAN HIGH WATER MHW = 0.716
North American Vertical Datum NAVD88 = 0.521
MEAN SEA LEVEL MSL = 0.395
MEAN TIDE LEVEL MTL = 0.381
MEAN LOW WATER MLW = 0.046
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/11/1977) = -0.847
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
NO 4 1929 1.863 1.147
NO 1 1975 5.290 4.574
NO 2 1975 2.354 1.638
NO 3 1975 1.215 0.499
6 1931 2.705 1.989
E 104 1962 1.901 1.185
F 104 1962 2.251 1.535
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 8 of 8
Station ID: 8570282 PUBLICATION DATE: 11/07/2003
Name: OCEAN CITY, ISLE OF WIGHT
MD
NOAA Chart: 12211 Latitude: 38° 19.9' N ( 38.33170)
USGS Quad: OCEAN CITY Longitude: 75° 5.4' W ( -75.09000)
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.