U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8570536 PUBLICATION DATE: 08/11/2003
Name: SOUTH POINT
MD
NOAA Chart: 12211 Latitude: 38° 12.9' N ( 38.21500)
USGS Quad: TINGLES ISLAND Longitude: 75° 11.5' W ( -75.19170)
To reach the tidal bench marks from the intersection of U.S. Highway 113 and
State Highway 376 in Berlin, proceed SE on State Highway 376 for 6.6 km (4.1 mi)
to State Highway 611, then turn right and proceed south on State Highway 611 for
5 km (3 mi) to a fork in the road, then bear right at the fork onto South Point
Road and proceed south on South Point Road for 5 km (3 mi) to South Point Boat
Landing. The bench marks are along South Point Road north of the boat landing.
The tide gage and staff were located at the SE end of the wharf.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 0536 A 1985
DESIGNATION: 857 0536 A
MONUMENTATION: Tidal Station disk VM#: 3028
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID#: BBDD30
LATITUDE: 38° 12.9' N ( 38.21500) LONGITUDE: 75° 11.5' W ( -75.19170)
The primary bench mark is a disk located across from the boat ramp, 24 m (80 ft)
SW of a tall pile on the east side of the boat ramp, 17.56 m (57.6 ft) NE of the
west corner of a 1-story dwelling, and 0.67 m (2.2 ft) NW of and in line with
the south face of the wharf. The bench mark is set 0.15 m (0.5 ft) below the
ground, crimped to the top of a stainless steel rod driven 8.5 m (28 ft) 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 2 of 5
Station ID: 8570536 PUBLICATION DATE: 08/11/2003
Name: SOUTH POINT
MD
NOAA Chart: 12211 Latitude: 38° 12.9' N ( 38.21500)
USGS Quad: TINGLES ISLAND Longitude: 75° 11.5' W ( -75.19170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0536 B 1985
DESIGNATION: 857 0536 B
MONUMENTATION: Tidal Station disk VM#: 3029
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 38° 12.9' N ( 38.21500) LONGITUDE: 75° 11.5' W ( -75.19170)
The bench mark is a disk located near the fork at the end of South Point Road,
44.78 m (146.9 ft) WNW of bench mark 0536 A 1985, 14.60 m (47.9 ft) ESE of a
0.52 m (1.7 ft) diameter cedar tree, 7.19 m (23.6 ft) SW of the centerline of
South Point Road, and 1.28 m (4.2 ft) east of power pole #REA CO-OP QS2B with
witness post. The bench mark is set 0.15 m (0.5 ft) below the ground, crimped
to the top of a stainless steel rod driven 11.0 m (36 ft), and encased in a
5-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 0536 C 1985
DESIGNATION: 857 0536 C
MONUMENTATION: Tidal Station disk VM#: 3030
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 38° 12.9' N ( 38.21500) LONGITUDE: 75° 11.5' W ( -75.19170)
The bench mark is a disk located along the east side of South Point Road, 85 m
(280 ft) north of bench mark 0536 B 1985, 4.94 m (16.2 ft) east of the
centerline of South Point Road, and 1.28 m (4.2 ft) west of power pole #REA
CO-OP Q122. The bench mark is set 0.15 m (0.5 ft) below the ground, crimped to
the top of a stainless steel rod driven 9.8 m (32 ft), 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 3 of 5
Station ID: 8570536 PUBLICATION DATE: 08/11/2003
Name: SOUTH POINT
MD
NOAA Chart: 12211 Latitude: 38° 12.9' N ( 38.21500)
USGS Quad: TINGLES ISLAND Longitude: 75° 11.5' W ( -75.19170)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 0536 D 1985
DESIGNATION: 857 0536 D
MONUMENTATION: Tidal Station disk VM#: 3031
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 38° 12.9' N ( 38.21500) LONGITUDE: 75° 11.5' W ( -75.19170)
The bench mark is a disk located along the east side of South Point Road, 164 m
(539 ft) north of bench mark 0536 C 1985, 7.13 m (23.3 ft) east of the
centerline of South Point Road, and 0.64 m (2.1 ft) west of power pole #REA
CO-OP Q120. The bench mark is set 0.15 m (0.5 ft) below the ground, crimped to
the top of a steel rod driven 7.3 m (24 ft), and encased in a 5-inch PVC pipe
and concrete kickblock.
BENCH MARK STAMPING: 0536 E 1985
DESIGNATION: 857 0536 E
MONUMENTATION: Tidal Station disk VM#: 3032
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 38° 12.9' N ( 38.21500) LONGITUDE: 75° 11.5' W ( -75.19170)
The bench mark is a disk located along the east side of South Point Road, 183.03
m (600.5 ft) north of bench mark 0536 D 1985, 54 m (177 ft) south of the
centerline of the driveway to the Mallardmead residence, 8.41 m (27.6 ft) east
of the centerline of South Point Road, and 0.49 m (1.6 ft) west of power pole
#REA CO-OP Q 1181. The bench mark is set 0.15 m (0.5 ft) below the ground,
crimped to the top of a stainless steel rod driven to an unspecified depth.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8570536 PUBLICATION DATE: 08/11/2003
Name: SOUTH POINT
MD
NOAA Chart: 12211 Latitude: 38° 12.9' N ( 38.21500)
USGS Quad: TINGLES ISLAND Longitude: 75° 11.5' W ( -75.19170)
T I D A L D A T U M S
Tidal datums at SOUTH POINT based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: August 1985 - October 1985
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8558690 INDIAN RIVER INLET
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.198
MEAN HIGH WATER MHW = 0.173
MEAN SEA LEVEL MSL = 0.105
MEAN TIDE LEVEL MTL = 0.102
MEAN LOW WATER MLW = 0.032
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
0536 A 1985 0.689 0.516
0536 B 1985 1.172 0.999
0536 C 1985 0.387 0.214
0536 D 1985 0.942 0.769
0536 E 1985 1.768 1.595
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8570536 PUBLICATION DATE: 08/11/2003
Name: SOUTH POINT
MD
NOAA Chart: 12211 Latitude: 38° 12.9' N ( 38.21500)
USGS Quad: TINGLES ISLAND Longitude: 75° 11.5' W ( -75.19170)
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.