U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 05/13/1992
Station ID: 8665737 SUPERCEDED DATE: 04/21/2003
Name: JACKSONBORO CAMP, EDISTO RIVER
SOUTH CAROLINA
NOAA Chart: 11521 Latitude: 32° 45.2' N
USGS Quad: COTTAGEVILLE Longitude: 80° 27.0' W
To reach the tidal bench marks from the west end of the U.S. Highway 17 bridge
over Edisto River near Jacksonboro, proceed west on U.S. Highway 17 for 0.5 mile
(0.8 km) to State Road S-15-30 in Jacksonboro, turn south onto State Road
S-15-30 and go 1.0 mile (1.6 km) to a dirt road on the left side of the road,
turn left (east) onto the dirt road and go 0.3 mile (0.5 km) to Edisto River.
The bench marks are along the row of cottages on the river. The tide gage and
staff were on the wooden sea wall beside a floating dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5737 A 1977
MONUMENTATION: Survey Disk VM#: 4226
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The primary bench mark is 34.4 feet (10.5 m) SSE of the SE corner of a red house
on stilts, 32.0 feet (9.8 m) NNE of the NE corner of a brown house on stilts,
13.2 feet (4.0 m) SW of the SW corner of a wooden dock, 9.5 feet (2.9 m) west of
the river shoreline, and 2.5 feet (0.8 m) north of the north edge of a homemade
concrete boat landing. The bench mark is 0.1 foot (0.03 m) below ground level,
crimped to a copper-clad steel rod driven 20 feet (6 m) to refusal, and encased
in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 5737 C 1977
MONUMENTATION: Survey Disk VM#: 4228
AGENCY: PID:
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is near the dirt road leading to State Road S-15-30, 168.6 feet
(51.4 m) north of Bench Mark 5737 G 1982, 65.0 feet (19.8 m) SW of the SW corner
of a brown house on stilts, 26.5 feet (8.1 m) west of the metal anchor
supporting the guy wire to power pole #85800, 22.0 feet (6.7 m) ENE of the
centerline of the dirt road from State Road S-15-30, and 4.0 feet (1.2 m) west
of power pole #85800. The bench mark is 0.1 foot (0.03 m) below ground level,
crimped to a copper-clad steel rod driven 20 feet (6 m) 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
PUBLICATION DATE: 05/13/1992
Station ID: 8665737 SUPERCEDED DATE: 04/21/2003
Name: JACKSONBORO CAMP, EDISTO RIVER
SOUTH CAROLINA
NOAA Chart: 11521 Latitude: 32° 45.2' N
USGS Quad: COTTAGEVILLE Longitude: 80° 27.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5737 E 1977
MONUMENTATION: Survey Disk VM#: 4230
AGENCY: PID#: CK3121
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is 97.7 feet (29.8 m) SW of the SW corner of a green house on
stilts, 85.0 feet (25.9 m) north of a tidal canal perpendicular to the river,
50.4 feet (15.4 m) NW of the NW corner of a white cinderblock house, 45.1 feet
(13.7 m) west of the SW corner of a white shingle house, and 5.0 feet (1.5 m) NE
of power pole #175950. The bench mark is 0.1 foot (0.03 m) below ground level,
crimped to a copper-clad steel rod driven 12 feet (4 m) to refusal, and encased
in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 5737 F 1982
MONUMENTATION: Survey Disk VM#: 7482
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a concrete monument 163.2 feet (49.7 m) north of Bench
Mark 5737 C 1977, 114.8 feet (35.0 m) NW of Bench Mark 5737 A 1977, 53.8 feet
(16.4 m) NW of the NW corner of a red house on stilts, 32.6 feet (9.9 m) NNE of
the NE corner of an open boat shed, 10.0 feet (3.0 m) SSW of underground cable
box #A39L1L1, 2.4 feet (0.7 m) SSW of power pole #175952, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 05/13/1992
Station ID: 8665737 SUPERCEDED DATE: 04/21/2003
Name: JACKSONBORO CAMP, EDISTO RIVER
SOUTH CAROLINA
NOAA Chart: 11521 Latitude: 32° 45.2' N
USGS Quad: COTTAGEVILLE Longitude: 80° 27.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5737 G 1982
MONUMENTATION: Survey Disk VM#: 7483
AGENCY: PID#: CK3120
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a concrete monument near a green house on stilts, 135.4
feet (41.3 m) NNE of Bench Mark 5737 E 1977, 51.2 feet (15.6 m) NE of the NE
corner of a green aluminum-sided house, 10.7 feet (3.3 m) east ofthe centerline
of a dirt road, 4.7 feet (1.4 m) north of power pole #175951, and 0.1 foot (0.03
m) below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 05/13/1992
Station ID: 8665737 SUPERCEDED DATE: 04/21/2003
Name: JACKSONBORO CAMP, EDISTO RIVER
SOUTH CAROLINA
NOAA Chart: 11521 Latitude: 32° 45.2' N
USGS Quad: COTTAGEVILLE Longitude: 80° 27.0' W
T I D A L D A T U M S
Tidal datums at JACKSONBORO CAMP, EDISTO RIVER based on:
LENGTH OF SERIES: 13 MONTHS
TIME PERIOD: JULY-DEC 1977, JUNE-DEC 1978
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 (03/21/1983) = 7.18
MEAN HIGHER HIGH WATER MHHW = 4.40
MEAN HIGH WATER MHW = 4.21
MEAN TIDE LEVEL MTL = 2.20
MEAN LOW WATER MLW = 0.19
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (07/09/1977) = -0.80
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
5737 A 1977 5.74 1.53
5737 C 1977 7.05 2.84
5737 E 1977 5.53 1.32
5737 F 1982 6.12 1.91
5737 G 1982 6.00 1.79
Foot Notes:
Because the tide signal is masked during high river stages, these tidal datums
are derived through computations based on 13 months of observations from June to
December (low river stage) during 1977 and 1978.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 05/13/1992
Station ID: 8665737 SUPERCEDED DATE: 04/21/2003
Name: JACKSONBORO CAMP, EDISTO RIVER
SOUTH CAROLINA
NOAA Chart: 11521 Latitude: 32° 45.2' N
USGS Quad: COTTAGEVILLE Longitude: 80° 27.0' 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.