U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 03/28/1989
Station ID: 8667101 SUPERCEDED DATE: 04/21/2003
Name: WINDSOR PLANTATION, RUSSEL CREEK
SOUTH CAROLINA
NOAA Chart: 11517 Latitude: 32° 35.9' N
USGS Quad: EDISTO ISLAND Longitude: 80° 20.7' W
To reach the tidal bench marks from the intersection of U.S. Highway 17 South
and Route 162, bear left onto Route 162 and travel for 11.0 miles (17.7 km),
bear left onto Route 164 and travel 2.4 miles (3.9 km), then turn left onto
Route 174 and proceed 7.7 miles (12.4 km), turn left onto the paved road right
before bridge, (paved road turns into dirt road), travel 0.2 miles (0.3 km) to a
dock located on Russel Creek. The bench marks are located along Route 174 and
the grounds of Windsor Plantation, and the gage and staff were located on the
dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7101 B 1982
MONUMENTATION: Survey Disk VM#: 6722
AGENCY: PID#: CK2501
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is 155.7 feet (47.5 m) east of the center of the bottom step of
the house, 49.0 feet (14.9 m) NNW of the center of the dock entrance, 23.0 feet
(7.0 m) SSE of the south face of a 4.0 foot (1.2 m) diameter live oak tree, and
9.8 feet (3.0 m) NNE of the north face of a 4.0 feet (1.2 m) diameter live oak
tree. The bench mark is 0.6 foot (0.2 m) below ground, crimped to a galvanized
steel rod driven 42 feet (13 m) to refusal, encased in a PVC pipe and concrete
kickblock.
BENCH MARK STAMPING: X 109 1962
MONUMENTATION: Survey Disk VM#: 6721
AGENCY: PID#: CK1769
SETTING CLASSIFICATION: Concrete Bridge Abutment
The bench mark is set flush in the NE corner of a concrete bridge abutment,
359.9 feet (109.7 m) NNE of Bench Mark 7101 E 1982, 18.0 feet (5.5 m) east of
the centerline of Route 174, 6.0 feet (1.8 m) SSW of an unnumbered telephone
junction box, and 2.0 feet (0.6 m) east of the NE bridge railing corner.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 03/28/1989
Station ID: 8667101 SUPERCEDED DATE: 04/21/2003
Name: WINDSOR PLANTATION, RUSSEL CREEK
SOUTH CAROLINA
NOAA Chart: 11517 Latitude: 32° 35.9' N
USGS Quad: EDISTO ISLAND Longitude: 80° 20.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7101 C 1982
MONUMENTATION: Survey Disk VM#: 6723
AGENCY: PID#: CK2500
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is 89.0 feet (27.1 m) west of the NW corner of the brick house
foundation, 88.0 feet (26.8 m) north of the centerline of a dirt road, 17.5 feet
(5.3 m) ENE of the fence tree line, and 3.0 feet (0.9 m) WSW of power pole
#236862. The bench mark is 0.4 foot (0.1 m) below ground, crimped to a
galvanized steel rod driven 32 feet (10 m) to refusal, encased in a PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: 7101 D 1982
MONUMENTATION: Survey Disk VM#: 6724
AGENCY: PID#: CK2499
SETTING CLASSIFICATION: Concrete Monument
The bench mark is 66.4 feet (20.2 m) east of the centerline of Route 174, 12.0
feet (3.7 m) north of the centerline of the paved road which turns into a dirt
road, 4.5 feet (1.4 m) west of the west face of a palmetto tree without a
witness sign, and 4.0 feet (1.2 m) east of the east face of a palmetto tree with
a witness sign, and set in a concrete monument at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 03/28/1989
Station ID: 8667101 SUPERCEDED DATE: 04/21/2003
Name: WINDSOR PLANTATION, RUSSEL CREEK
SOUTH CAROLINA
NOAA Chart: 11517 Latitude: 32° 35.9' N
USGS Quad: EDISTO ISLAND Longitude: 80° 20.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7101 E 1982
MONUMENTATION: Survey Disk VM#: 6725
AGENCY: PID#: CK2502
SETTING CLASSIFICATION: Bridge Abutment
The bench mark is set flush in the SW bridge abutment of the Route 174 bridge
across Russel Creek, 16.5 feet (5.0 m) west of the centerline of Route 174, 2.0
feet (0.6 m) NW of the 4.0 feet (1.2 m) x 4.0 feet (1.2 m) reflecting bridge
sign, 1.9 feet (0.6 m) west of the SW corner of the bridge railing, and 1.0 foot
(0.3 m) east of the west side of the corner of the bridge abutment.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 03/28/1989
Station ID: 8667101 SUPERCEDED DATE: 04/21/2003
Name: WINDSOR PLANTATION, RUSSEL CREEK
SOUTH CAROLINA
NOAA Chart: 11517 Latitude: 32° 35.9' N
USGS Quad: EDISTO ISLAND Longitude: 80° 20.7' W
T I D A L D A T U M S
Tidal datums at WINDSOR PLANTATION, RUSSEL CREEK based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: OCTOBER 1982-FEBRUARY 1983
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 (02/28/1983) = 9.01
MEAN HIGHER HIGH WATER MHHW = 6.94
MEAN HIGH WATER MHW = 6.61
MEAN TIDE LEVEL MTL = 3.41
MEAN LOW WATER MLW = 0.21
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (12/30/1982) = -0.94
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
7101 B 1982 9.83 3.22
X 109 1962 18.79 12.18
7101 C 1982 9.72 3.11
7101 D 1982 9.40 2.79
7101 E 1982 17.18 10.57
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 03/28/1989
Station ID: 8667101 SUPERCEDED DATE: 04/21/2003
Name: WINDSOR PLANTATION, RUSSEL CREEK
SOUTH CAROLINA
NOAA Chart: 11517 Latitude: 32° 35.9' N
USGS Quad: EDISTO ISLAND Longitude: 80° 20.7' 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.