NOAA Web Site Link Tides and Currents Home Page Transparent placeholder image

Bench Mark Sheet for 8570283, Ocean City Inlet MD

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  8

                                                                                
Station ID: 8570283                                PUBLICATION DATE:  12/20/2012
Name:       OCEAN CITY INLET                                  
            MD
NOAA Chart: 12211                                  Latitude:         38° 19.7' N
USGS Quad:  OCEAN CITY                             Longitude:        75°  5.5' W


To reach the tidal bench marks from the east end of the US Highway 50 bridge and
Philadelphia Avenue in Ocean City, proceed south on Philadelphia Avenue for 0.5
km (0.3 mi) to the intersection with Worchester Street, turn right on Worchester
Street, then left into the US Coast Guard Station.  The bench marks are located
on the grounds of the station.  The tide gage was located on the westernmost
pier at the boat basin.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  0280 J 1982
                         DESIGNATION:          857 0283 J TIDAL

MONUMENTATION:           Tidal Station disk                        VM#:    13880
AGENCY:                  National Ocean Service (NOS)              PID#:  DL8731
SETTING CLASSIFICATION:  Stainless steel rod


The primary bench mark is a disk located in the SE corner of the U.S. Coast
Guard station, on the south side of the U.S. Coast Guard Station, 28.47 m (93.4
ft) SE of the east leg of a steel radio tower, 18.99 m (62.3 ft) SSW of the SW
corner of the Coast Guard barracks, 4.63 m (15.2 ft) NNE of the SE corner of a
chain link fence, and 1.31 m (4.3 ft) WSW of the chain link fence.  The bench
mark is set 9 cm (0.3 ft) below ground level, crimped to the top of a stainless
steel rod driven an unspecified depth, 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  8

                                                                                
Station ID: 8570283                                PUBLICATION DATE:  12/20/2012
Name:       OCEAN CITY INLET                                  
            MD
NOAA Chart: 12211                                  Latitude:         38° 19.7' N
USGS Quad:  OCEAN CITY                             Longitude:        75°  5.5' W


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  OC 1 1997
                         DESIGNATION:          857 0283 OC 1

MONUMENTATION:           Survey disk                               VM#:    13877
AGENCY:                  National Ocean Service (NOS)              PID#:  DL8733
SETTING CLASSIFICATION:  Concrete retaining wall


The bench mark is a disk set flush in the NE corner of a 0.6 m (2 ft) high
concrete knee wall surrounding the fuel storage tanks, 21.50 m (70.5 ft) south
of the north side of a 2.0 m (6.6 ft) black chain link fence, 20.10 m (65.9 ft)
NNE of the SW face of the concrete bulkhead, and 12.83 m (42.1 ft) north of the
center of a paved road leading to the docks.



                         BENCH MARK STAMPING:  0280 H 1980
                         DESIGNATION:          857 0283 H

MONUMENTATION:           Tidal Station disk                        VM#:    13879
AGENCY:                  National Ocean Service (NOS)              PID:         
SETTING CLASSIFICATION:  Stainless steel rod


The bench mark is located on the north side of the coast guard station at
Worchester street and Philadelphia avenue near the entrance to the base, 21.27 m
(69.78 ft) ESE of a white hydrant, 8.75 M (28.71 ft) SW of the centerline of
Worchester st, 5.51 m (18.08 ft) WNW of the NE corner of a white knee wall at
the entrance of the base, 2.50 m (8.20 ft) WNW of the NE corner of a fence, the
bench mark is set at ground level, crimped to the top of a stainless steel rod
driven an unspecified depth, and encased in a 4-inch PVC pipe and concrete kick
block.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  8

                                                                                
Station ID: 8570283                                PUBLICATION DATE:  12/20/2012
Name:       OCEAN CITY INLET                                  
            MD
NOAA Chart: 12211                                  Latitude:         38° 19.7' N
USGS Quad:  OCEAN CITY                             Longitude:        75°  5.5' W


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  11/11 RESET 2000 BALTIMORE
                         DESIGNATION:          857 0283 11/11 RESET

MONUMENTATION:           Survey disk                               VM#:    16830
AGENCY:                  US Army Corps of Engineers (USE)          PID#:  DL8735
SETTING CLASSIFICATION:  Bulkhead


The bench mark is a disk set in the bulkhead cap along the boat basin, 9.65 m
(31.66 ft) SW of the NW corner of the dock shack, 8.68 M (28.48 ft) NW of a
metal light pole, 0.85 m (2.79 ft) east of the NW corner of the dock, and set
flush in the concrete dock.



                         BENCH MARK STAMPING:  OCM 1B 99
                         DESIGNATION:          857 0283 OCM 1B

MONUMENTATION:           Survey disk                               VM#:    16831
AGENCY:                  US Army Corps of Engineers (USE)          PID#:  DL8736
SETTING CLASSIFICATION:  Sidewalk


The bench mark is a disk set flush in the sidewalk at the SE corner of the
intersection of Baltimore Avenue and South 1st Street, 9.75 m (32.0 ft) east of
the center median of Baltimore Street, 8.45 m (27.7 ft) south of the centerline
of South First Street, and 2.43 m (7.97 ft) NNW of the center of a sign for the
inlet lodge.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  8

                                                                                
Station ID: 8570283                                PUBLICATION DATE:  12/20/2012
Name:       OCEAN CITY INLET                                  
            MD
NOAA Chart: 12211                                  Latitude:         38° 19.7' N
USGS Quad:  OCEAN CITY                             Longitude:        75°  5.5' W


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  SPEICHER 1956
                         DESIGNATION:          SPEICHER

MONUMENTATION:           Survey disk                               VM#:    16832
AGENCY:                  US Army Corps of Engineers (USE)          PID#:  HU0266
SETTING CLASSIFICATION:  Sea wall


The bench mark is a disk set in the sea wall on the north side of the inlet
located near the intersection of Boardwalk Street and Baltimore Street, 14.72 m
(48.3 ft) SSW of the centerline of Baltimore Street, 7.53 m (24.7 ft) ESE of the
west corner of a metal handrail, and 0.42 m (1.4 ft) north of the south edge of
the sea wall. 

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  8

                                                                                
Station ID: 8570283                                PUBLICATION DATE:  12/20/2012
Name:       OCEAN CITY INLET                                  
            MD
NOAA Chart: 12211                                  Latitude:         38° 19.7' N
USGS Quad:  OCEAN CITY                             Longitude:        75°  5.5' W


                         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#:    17700
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  HU0267
SETTING CLASSIFICATION:  Brick chimmey


The bench mark is a disk set flush in the concrete foundation of the brick
chimney at the NW corner of the Hotel Atlantic, near the intersection of
Baltimore Avenue and Somerset Street, 35.69 m (117.1 ft) east of the east curb
of Baltimore Avenue, 6.40 m (21.0 ft) south of the south curb of Somerset
Street, 0.24 m (0.79 ft) north of the north edge, 0.20 m (0.66 ft) west of the
west edge, and 0.25 m (0.8 ft) above the level of the ground.



                         BENCH MARK STAMPING:  INLET BALTO DIST 1994
                         DESIGNATION:          857 0283 11/11 INLET

MONUMENTATION:           Survey disk                               VM#:    18664
AGENCY:                  US Corp of Engineers (USE)                PID:         
SETTING CLASSIFICATION:  Concrete monument


The bench mark is set flush in a concrete monument, 25.78 m (84.6 ft) west of
the north leg of a three legged tower, 17.84 m (58.5 ft) south of a metal light
pole, 4.36 m (14.3 ft) SSW of the SW corner of a metal building, and 0.3 m (1.0
ft) above the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  8

                                                                                
Station ID: 8570283                                PUBLICATION DATE:  12/20/2012
Name:       OCEAN CITY INLET                                  
            MD
NOAA Chart: 12211                                  Latitude:         38° 19.7' N
USGS Quad:  OCEAN CITY                             Longitude:        75°  5.5' W


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  F 104 RESET
                         DESIGNATION:          F 104 RESET

MONUMENTATION:           Tidal Station disk                        VM#:    19241
AGENCY:                  National Ocean Survey/Service (NOS)       PID#:  DL8738
SETTING CLASSIFICATION:  Concrete drive way


The mark is 29.25 m (96.0 ft) north of the centerline of Dorchester Street, 7.08
m (23.2 ft) northwest of the center of the fire hydrant at the southwest corner
of the intersection of Baltimore Avenue and Dorchester Street, and 6.25 m (20.5
ft) southeast of the southwest corner of the fire company building.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  8

                                                                                
Station ID: 8570283                                PUBLICATION DATE:  12/20/2012
Name:       OCEAN CITY INLET                                  
            MD
NOAA Chart: 12211                                  Latitude:         38° 19.7' N
USGS Quad:  OCEAN CITY                             Longitude:        75°  5.5' W


                            T I D A L   D A T U M S 


Tidal datums at OCEAN CITY INLET based on:

     LENGTH OF SERIES:      9 YEARS
     TIME PERIOD:           Aug 02 - July 08 & April 09 - March 12
     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 (02/05/1998)         =  1.852
     MEAN HIGHER HIGH WATER                     MHHW   =  0.751
     MEAN HIGH WATER                            MHW    =  0.690
     North American Vertical Datum              NAVD88 =  0.499
     MEAN SEA LEVEL                             MSL    =  0.390
     MEAN TIDE LEVEL                            MTL    =  0.369
     MEAN LOW WATER                             MLW    =  0.049
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (02/17/2007)         = -0.732

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     0280 J 1982                                 2.530    1.840
     OC 1 1997                                   2.672    1.982
     0280 H 1980                                 2.066    1.376
     11/11 RESET 2000 BALTIMORE                  2.286    1.596
     OCM 1B 99                                   1.907    1.217
     SPEICHER 1956                               3.484    2.794
     6 1931                                      2.682    1.992
     INLET BALTO DIST 1994                       2.024    1.334
     F 104 RESET                                 1.568    0.878


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  8

                                                                                
Station ID: 8570283                                PUBLICATION DATE:  12/20/2012
Name:       OCEAN CITY INLET                                  
            MD
NOAA Chart: 12211                                  Latitude:         38° 19.7' N
USGS Quad:  OCEAN CITY                             Longitude:        75°  5.5' 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.

Return to Top
Products available at 8570283 Ocean City Inlet, MD

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services