U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 09/14/1987
Station ID: 8667901 SUPERCEDED DATE: 04/21/2003
Name: LADIES ISLAND, LUCY POINT CREEK
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 27.1' N
USGS Quad: FROGMORE Longitude: 80° 36.6' W
To reach the tidal bench marks from the Richard V. Woods Memorial Bridge at U.S.
Highway 21, travel SE on U.S. Highway 21 for 1.9 miles (3.1 km) to the
intersection of U.S. Highway 21 and SC Highway 802 (Sams Point Road) proceed
north on SC Highway 802 for 2.4 miles (3.9 km) to State Road S-7-112, turn right
onto S-7-112 and travel 1.8 miles (2.9 km) to a fork in the road, bear left onto
S-7-245 and travel 0.5 mile (0.8 km) to a T, turn left onto Magnolia River
Drive, 0.1 mile (0.2 km) to a dirt path leading to the boat landing and pier.
The bench marks are located along Morgan River Drive and the tide gage and staff
were located on the Housing Authority Pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7901 A 1977
MONUMENTATION: Survey Disk VM#: 4405
AGENCY: PID#: CK2374
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is located at the land end of the pier, just north of the path,
381.6 feet (116.3 m) east of the centerline of Morgan River Drive, 25.0 feet
(7.6 m) SSE of the center of a multi-base maple tree, 22.0 feet (6.7 m) NE of
the centerline of a paved drive leading toward the river and 7.8 feet (2.4 m) NW
of the center of the dock entrance. The bench mark is level with the ground,
crimped to a galvanized steel rod, driven to refusal and encased in a 5-inch PVC
pipe and concrete kickblock.
BENCH MARK STAMPING: 7901 E 1977
MONUMENTATION: Survey Disk VM#: 4407
AGENCY: PID#: CK2371
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is located on the west side of Morgan River Drive, 373.7 feet
(113.9 m) NNE of Bench Mark 7901 C 1977, 79.0 feet (24.1 m) WSW of telephone
cable junction box #RP 555614, 37.5 feet (11.4 m) SSW of telephone cable
junction box #RP 551623, 34.2 feet (10.4 m) WNW of the centerline of Morgan
River Drive, and 1.5 feet (0.5 m) ENE of a metal witness post. The bench mark
is level with the ground, crimped to galvanized steel rod driven 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 4
PUBLICATION DATE: 09/14/1987
Station ID: 8667901 SUPERCEDED DATE: 04/21/2003
Name: LADIES ISLAND, LUCY POINT CREEK
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 27.1' N
USGS Quad: FROGMORE Longitude: 80° 36.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7901 F 1981
MONUMENTATION: Survey Disk VM#: 4408
AGENCY: PID#: CK2370
SETTING CLASSIFICATION: Concrete Monument
The bench mark is 131.6 feet (40.1 m) NW of the NW corner of a white brick
house, 33.9 feet (10.3 m) ESE of the centerline of Morgan River Drive, 30.3 feet
(9.2 m) north of the centerline of the north end of a circular drive leading to
the white brick house, 9.9 feet (3.0 m) SSE of telephone cable junction box #RP
555670, and 0.1 foot (0.03 m) below ground level, set in a concrete monument.
BENCH MARK STAMPING: 7901 G 1981
MONUMENTATION: Survey Disk VM#: 4409
AGENCY: PID#: CK2372
SETTING CLASSIFICATION: Concrete Monument
The bench mark is 263.4 feet (80.3 m) NE of Bench Mark 7901 E 1977, 65.1 feet
(19.8 m) SE of a black lamp post with light, 44.0 feet (13.4 m) ENE of a triple
trunked oak tree, 21.0 feet (6.4 m) ENE of the centerline of the circular end of
Morgan River Drive, 11.0 feet (3.4 m) WNW of telephone cable, junction box #RP
555615, 0.1 foot (0.03 m) below ground level, and set in a concrete monument.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 09/14/1987
Station ID: 8667901 SUPERCEDED DATE: 04/21/2003
Name: LADIES ISLAND, LUCY POINT CREEK
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 27.1' N
USGS Quad: FROGMORE Longitude: 80° 36.6' W
T I D A L D A T U M S
Tidal datums at LADIES ISLAND, LUCY POINT CREEK based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: AUGUST-SEPTEMBER 1980
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8665530 CHARLESTON
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (05/05/1981) = 8.69
MEAN HIGHER HIGH WATER MHHW = 6.72
MEAN HIGH WATER MHW = 6.37
MEAN TIDE LEVEL MTL = 3.21
MEAN LOW WATER MLW = 0.05
MEAN LOWER LOW WATER MLLW = 0.00
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
7901 A 1977 10.80 4.43
7901 E 1977 20.23 13.86
7901 F 1981 17.77 11.40
7901 G 1981 19.85 13.48
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 09/14/1987
Station ID: 8667901 SUPERCEDED DATE: 04/21/2003
Name: LADIES ISLAND, LUCY POINT CREEK
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 27.1' N
USGS Quad: FROGMORE Longitude: 80° 36.6' 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.