U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8665257 PUBLICATION DATE: 07/26/2004
Name: EDISTO RIVER, SOUTH OF CANADAY LANDING
SC
NOAA Chart: 11521 Latitude: 32° 48.8' N ( 32.81330)
USGS Quad: JACKSONBORO Longitude: 80° 24.4' W ( -80.40670)
To reach the tidal bench marks from the intersection of U.S. Highway 17 and
State Road S-10-38 in Parkers Ferry, proceed north on State Road S-10-38 for 6.0
km (3.7 mi), then west onto a dirt road, bear left at the fork and continue for
0.3 km (0.2 mi) to a three-way split in the dirt road, bear to the far right and
follow the road to the river. The bench marks are in an open area with small,
sparsely scattered trees. The tide gage and staff were on a small constructed
platform.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5257 A 1982
DESIGNATION: 866 5257 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 4152
AGENCY: National Ocean Survey (NOS) IDB PID#: CK3139
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 48.8' N ( 32.81330) LONGITUDE: 80° 24.3' W ( -80.40500)
The primary bench mark is a disk located near the river on the south side of an
old grassy boat ramp, 46.57 m (152.8 ft) west of bench mark 5257 B 1982, 17.37 m
(57.0 ft) north of the NW corner of a green cookout shed, 16.76 m (55.0 ft) east
of the east bank of Edisto River, 15.82 m (51.9 ft) SW of the southernmost
magnolia tree, 11.67 m (38.3 ft) west of a 0.46 m (1.5 ft) diameter oak tree,
and 0.55 m (1.8 ft) south of an 2 m (8 ft) tall post with light. The bench mark
is set 9 cm (0.3 ft) below ground level, crimped to the top of a stainless steel
rod driven 9.8 m (32 ft) to refusal, and encased in a PVC pipe and concrete
kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8665257 PUBLICATION DATE: 07/26/2004
Name: EDISTO RIVER, SOUTH OF CANADAY LANDING
SC
NOAA Chart: 11521 Latitude: 32° 48.8' N ( 32.81330)
USGS Quad: JACKSONBORO Longitude: 80° 24.4' W ( -80.40670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5257 B 1982
DESIGNATION: 866 5257 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 4153
AGENCY: National Ocean Survey (NOS) IDB PID#: CK3140
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 48.8' N ( 32.81330) LONGITUDE: 80° 24.3' W ( -80.40500)
The bench mark is a disk set flush in a concrete monument located by a utility
pole SE of a boat landing, 53.58 m (175.8 ft) SW of bench mark 5257 C 1982, 6.40
m (21.0 ft) WNW of guy wire anchor, 5.79 m (19.0 ft) SE of a 0.46 m (1.5 ft)
diameter oak tree, 5.15 m (16.9 ft) NNE of the centerline of the dirt drive
leading toward the river, and 0.46 m (1.5 ft) north of power pole #43294.
BENCH MARK STAMPING: 5257 C 1982
DESIGNATION: 866 5257 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 4154
AGENCY: National Ocean Survey (NOS) IDB PID#: CK3141
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 48.8' N ( 32.81330) LONGITUDE: 80° 24.3' W ( -80.40500)
The bench mark is a disk set flush in a concrete monument located just before a
three way split in the road and in between two 0.52 m pine trees (1.7 ft), 73.15
m (240.0 ft) NE of bench mark 5257 D 1982, 10.70 m (35.1 ft) WNW of the dirt
drive leading to the main road, 2.74 m (9.0 ft) NNW of a 0.61 m (2.0 ft)
diameter pine tree with a crook in the trunk, and 2.41 m (7.9 ft) SE of a 0.61 m
(2.0 ft) diameter pine tree with witness sign.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8665257 PUBLICATION DATE: 07/26/2004
Name: EDISTO RIVER, SOUTH OF CANADAY LANDING
SC
NOAA Chart: 11521 Latitude: 32° 48.8' N ( 32.81330)
USGS Quad: JACKSONBORO Longitude: 80° 24.4' W ( -80.40670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5257 D 1982
DESIGNATION: 866 5257 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 4155
AGENCY: National Ocean Survey (NOS) IDB PID#: CK3142
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 48.8' N ( 32.81330) LONGITUDE: 80° 24.2' W ( -80.40330)
The bench mark is a disk located near a triple trunk oak tree, 47.67 m (156.4
ft) east of bench mark 5257 E 1982, 31.24 m (102.5 ft) ENE of power pole
#166584, 4.57 m (15.0 ft) NNW of the centerline of the dirt road, and 2.90 m
(9.5 ft) WNW of a multi-trunk oak tree. The bench mark is set 9 cm (0.3 ft)
below ground level, crimped to the top of a stainless steel rod driven 9.8 m (32
ft) to refusal, and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 5257 E 1982
DESIGNATION: 866 5257 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 4156
AGENCY: National Ocean Survey (NOS) IDB PID#: CK3143
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 48.8' N ( 32.81330) LONGITUDE: 80° 24.3' W ( -80.40500)
The bench mark is a disk set flush in a concrete monument located in the south
angle at the intersection of two sand roads, 62.79 m (206.0 ft) south of bench
mark 5257 A 1982, 35.08 m (115.1 ft) south of the east bank of a small creek
running parallel to Edisto River, 19.20 m (63.0 ft) WNW of power pole #166584,
and 4.57 m (15.0 ft) SE of the centerline of the dirt road running parallel to
the river.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8665257 PUBLICATION DATE: 07/26/2004
Name: EDISTO RIVER, SOUTH OF CANADAY LANDING
SC
NOAA Chart: 11521 Latitude: 32° 48.8' N ( 32.81330)
USGS Quad: JACKSONBORO Longitude: 80° 24.4' W ( -80.40670)
T I D A L D A T U M S
Tidal datums at EDISTO RIVER, SOUTH OF CANADAY LANDING based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: December 1982 - December 1982
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8665530 CHARLESTON, COOPER RIVER ENTRANCE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.308
MEAN HIGH WATER MHW = 0.277
MEAN TIDE LEVEL MTL = 0.149
MEAN SEA LEVEL MSL = 0.148
MEAN LOW WATER MLW = 0.021
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5257 A 1982 3.239 2.962
5257 B 1982 4.016 3.739
5257 C 1982 3.831 3.554
5257 D 1982 4.785 4.508
5257 E 1982 3.410 3.133
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8665257 PUBLICATION DATE: 07/26/2004
Name: EDISTO RIVER, SOUTH OF CANADAY LANDING
SC
NOAA Chart: 11521 Latitude: 32° 48.8' N ( 32.81330)
USGS Quad: JACKSONBORO Longitude: 80° 24.4' W ( -80.40670)
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.