U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8571559 PUBLICATION DATE: 08/08/2011
Name: MCCREADYS CREEK, FISHING BAY
MD
NOAA Chart: 12261 Latitude: 38° 18.0' N ( 38.30000)
USGS Quad: WINGATE Longitude: 76° 0.3' W ( -76.00500)
To reach the tidal bench marks from the intersection of US Highway 50 and State
Highway 331 in Vienna, at the west end of the US 50 bridge over the Nanticoke
River, proceed south on State Highway 331 for 0.9 km (0.6 mi) to Gay Street,
then continue south on Gay Street to Linden Lane, then turn left on Linden Lane
and go one block, then right onto Market Street (Market Street turns into
Elliott Island Road at Henrys Crossroads) and proceed SW for 29.0 km (18.0 mi)
to a fork in the road at the village of Elliot, bear left at the fork on Wnarf
Rd and proceed 1.1 km (0.7 mi) to the end of road at the county dock. The bench
marks are along the road and around the picnic area. The tide gage is located
on the wooden bulkhead along the south end of the parking lot for the dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 1559 B 1981
DESIGNATION: 857 1559 B
MONUMENTATION: Tidal Station disk VM#: 3066
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 38° 18.1' N ( 38.30131) LONGITUDE: 76° 0.4' W ( -76.00619)
The primary bench mark is a disk located near the picnic area, 4.25 m (13.94 ft)
west of the NE corner of the concrete slab for the shaded picnic area, and 3.80
m (12.46 ft) NNE of the NW corner of the concrete slab for the picnic area, and
3.80 m (12.46 ft) NNE of the NW corner of the conrete slab for the picnic area.
The bench mark is crimped to the top of a stainless steel rod driven 17.1 m (56
ft) 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 5
Station ID: 8571559 PUBLICATION DATE: 08/08/2011
Name: MCCREADYS CREEK, FISHING BAY
MD
NOAA Chart: 12261 Latitude: 38° 18.0' N ( 38.30000)
USGS Quad: WINGATE Longitude: 76° 0.3' W ( -76.00500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 1559 D 1981
DESIGNATION: 857 1559 D
MONUMENTATION: Tidal Station disk VM#: 3068
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 38° 18.1' N ( 38.30239) LONGITUDE: 76° 0.4' W ( -76.00636)
The bench mark is a disk located along the road leading to the county dock, 63.4
m (208 ft) NNW of bench mark 1559 C 1981, and 3.77 m (12.36 ft) east of the
centerline of the road along the edge of the marsh reeds. The bench mark is
crimped to the top of a stainless steel rod driven 16.2 m (53 ft) to refusal,
and encased in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 1559 E 1981
DESIGNATION: 857 1559 E
MONUMENTATION: Tidal Station disk VM#: 3069
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 38° 18.2' N ( 38.30297) LONGITUDE: 76° 0.4' W ( -76.00658)
The bench mark is a disk located along the road leading to the county dock,
62.85 m (206.2 ft) NNW of bench mark 1559 D 1981, and 4.70 m (15.41 ft) east of
the centerline of the road along the edge of the marsh reeds. The bench mark is
crimped to the top of a stainless steel rod driven 15.8 m (52 ft) 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 3 of 5
Station ID: 8571559 PUBLICATION DATE: 08/08/2011
Name: MCCREADYS CREEK, FISHING BAY
MD
NOAA Chart: 12261 Latitude: 38° 18.0' N ( 38.30000)
USGS Quad: WINGATE Longitude: 76° 0.3' W ( -76.00500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 033MC03A 1992 BALTO DIST
DESIGNATION: 857 1559 033MC03A
MONUMENTATION: Survey disk VM#: 17321
AGENCY: US Army Corps of Engineers (USE) IDB PID#:
SETTING CLASSIFICATION: Asphalt OPUS PID#: BBCF65
LATITUDE: 38° 18.0' N ( 38.30058) LONGITUDE: 76° 0.3' W ( -76.00569)
The bench mark is a disk set in the asphalt parking lot at the county dock,
50.13 m (164.5 ft) SSE of a utility pole with electric meter 29.44 m (96.58 ft)
west of center of the utility pole with tackle and boom attached, perpendicular
to the entrance channel bulkhead, and 11.08 m (36.35 ft) north of the north end
of the bulkhead running perpendicular to the entrance channel bulkhead.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8571559 PUBLICATION DATE: 08/08/2011
Name: MCCREADYS CREEK, FISHING BAY
MD
NOAA Chart: 12261 Latitude: 38° 18.0' N ( 38.30000)
USGS Quad: WINGATE Longitude: 76° 0.3' W ( -76.00500)
T I D A L D A T U M S
Tidal datums at MCCREADYS CREEK, FISHING BAY based on:
LENGTH OF SERIES: 3 YEARS
TIME PERIOD: Feb. 2005 - Jan. 2007 & Jan. 2009 - Dec. 2009
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8577330 SOLOMONS ISLAND, PATUXENT RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (05/12/2008) = 1.378
MEAN HIGHER HIGH WATER MHHW = 0.729
MEAN HIGH WATER MHW = 0.678
MEAN TIDE LEVEL MTL = 0.358
MEAN SEA LEVEL MSL = 0.357
MEAN LOW WATER MLW = 0.039
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/15/2006) = -0.505
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
1559 B 1981 1.106 0.428
1559 D 1981 0.944 0.266
1559 E 1981 0.869 0.191
033MC03A 1992 BALTO DIST 1.022 0.344
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8571559 PUBLICATION DATE: 08/08/2011
Name: MCCREADYS CREEK, FISHING BAY
MD
NOAA Chart: 12261 Latitude: 38° 18.0' N ( 38.30000)
USGS Quad: WINGATE Longitude: 76° 0.3' W ( -76.00500)
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.