U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8666017 PUBLICATION DATE: 03/09/2004
Name: EDISTO RIVER, SOUTH OF PENNY CREEK
SC
NOAA Chart: 11521 Latitude: 32° 42.9' N ( 32.71500)
USGS Quad: FENWICK Longitude: 80° 26.2' W ( -80.43670)
To reach the tidal bench marks from U.S. Highway 17 Bridge over Edisto River,
travel 0.5 mile (0.8 km) west on U.S. Highway 17 to State Road S-15-30, then
turn left and proceed south on State Road S-15-30 for 4.2 km (2.6 mi) to the end
of the paved road, then continue on the dirt road for 1.8 km (1.1 mi) to the
entrance to Hope Plantation, then continue for 0.8 km (0.5 mi) to a bend in the
road, then turn left onto a dim track road and proceed 0.6 km (0.4 mi) through
the woods to a small turn around area, then walk east along a path to the west
bank of Edisto River. The bench marks are located along the dim track road.
The tide gage and staff were located on a platform 2 m (8 ft) from the shore.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6017 A 1978
DESIGNATION: 866 6017 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 4240
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 42.9' N ( 32.71500) LONGITUDE: 80° 26.2' W ( -80.43670)
The primary bench mark is a disk set flush in the top of a concrete monument
located between the river and the turn-around area, 20 m (66 ft) NE of a 0.40 m
(1.3 ft) diameter oak tree in the center of the turn around area, 2.77 m (9.1
ft) south of a 0.46 m (1.5 ft) diameter pine tree, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8666017 PUBLICATION DATE: 03/09/2004
Name: EDISTO RIVER, SOUTH OF PENNY CREEK
SC
NOAA Chart: 11521 Latitude: 32° 42.9' N ( 32.71500)
USGS Quad: FENWICK Longitude: 80° 26.2' W ( -80.43670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6017 B 1978
DESIGNATION: 866 6017 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 4241
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 42.9' N ( 32.71500) LONGITUDE: 80° 26.2' W ( -80.43670)
The bench mark is a disk set flush in the top of a concrete monument on the
south side of the track road west of the turn-around area, 80 m (261 ft) WSW of
bench mark 6017 A 1978, 3.72 m (12.2 ft) SSE of the centerline of the road, 0.85
m (2.8 ft) west of a witness post, and at ground level.
BENCH MARK STAMPING: 6017 D 1978
DESIGNATION: 866 6017 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 4243
AGENCY: National Ocean Survey (NOS) IDB PID#: CK3127
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 42.8' N ( 32.71330) LONGITUDE: 80° 26.5' W ( -80.44170)
The bench mark is a disk located on the south side of the track road, 128 m (420
ft) east of bench mark 6017 E 1978, 7.47 m (24.5 ft) south of the centerline of
the road, 4.48 m (14.7 ft) west of a 1.22 m (4.0 ft) diameter oak tree, 4.15 m
(13.6 ft) east of a 0.91 m (3.0 ft) diameter oak tree, and 0.46 m (1.5 ft) SW of
a witness post. The bench mark is set 6 cm (0.2 ft) below ground level, crimped
to the top of a stainless steel rod driven 9.1 m (30 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 3 of 6
Station ID: 8666017 PUBLICATION DATE: 03/09/2004
Name: EDISTO RIVER, SOUTH OF PENNY CREEK
SC
NOAA Chart: 11521 Latitude: 32° 42.9' N ( 32.71500)
USGS Quad: FENWICK Longitude: 80° 26.2' W ( -80.43670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6017 E 1978
DESIGNATION: 866 6017 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 4244
AGENCY: National Ocean Survey (NOS) IDB PID#: CK3126
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 42.8' N ( 32.71330) LONGITUDE: 80° 26.5' W ( -80.44170)
The bench mark is a disk located at the intersection of the main dirt road and
the track road, 26.82 m (88.0 ft) east of the centerline of the dirt road, 10.36
m (34.0 ft) NNW of the centerline of the track road, 6.74 m (22.1 ft) east of a
1.22 m (4.0 ft) diameter oak tree, 2.62 m (8.6 ft) SW of a 0.46 m (1.5 ft)
diameter oak tree, and 0.40 m (1.3 ft) ENE of a witness post. The bench mark is
set 6 cm (0.2 ft) below ground level, crimped to the top of a stainless steel
rod driven 12.8 m (42 ft) to refusal, and encased in a PVC pipe and concrete
kickblock.
BENCH MARK STAMPING: 6017 F 1984
DESIGNATION: 866 6017 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 17294
AGENCY: National Ocean Service (NOS) IDB PID#: CK3128
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 42.8' N ( 32.71330) LONGITUDE: 80° 26.5' W ( -80.44170)
The bench mark is a disk located 0.6 km (0.4 mi) SE along U.S Highway 17 from
the junction of State Highway 64 in Jacksonboro, 13.25 m (43.5 ft) NNW of the
approximate center of the grassy road that runs east and west, 13.11 m (43.0 ft)
WSW of the approximate center of the grassy road that runs north and south, 7.32
m (24.0 ft) NNE of a lone 100 inch oak tree, and 2.26 m (7.4 ft) east of the
cedar tree. The bench mark is crimped to the top of a stainless steel rod
driven 14.6 m (47.9 ft) to substantial resistance.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8666017 PUBLICATION DATE: 03/09/2004
Name: EDISTO RIVER, SOUTH OF PENNY CREEK
SC
NOAA Chart: 11521 Latitude: 32° 42.9' N ( 32.71500)
USGS Quad: FENWICK Longitude: 80° 26.2' W ( -80.43670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6017 H 1984
DESIGNATION: 866 6017 H TIDAL
MONUMENTATION: Tidal Station disk VM#: 17295
AGENCY: National Ocean Service (NOS) IDB PID#: CK3129
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 42.9' N ( 32.71500) LONGITUDE: 80° 26.3' W ( -80.43830)
The benchmark is a disk set into the top of a concrete post, near a lone 24-inch
pine tree just past the lone 24-inch oak tree in the center of the road, 52.1 m
(171 ft) WSW of the approximate edge of the rover, 20.27 m (66.5 ft) ENE of the
lone 24-inch oat tree, 6.7 m (22 ft) NNW of the approximate edge of the marsh,
and 2.7 m (9 ft) south of the lone pine tree.
BENCH MARK STAMPING: 6017 G 1984
DESIGNATION: 866 6017 G TIDAL
MONUMENTATION: Tidal Station disk VM#: 17296
AGENCY: National Ocean Service (NOS) IDB PID#: CK3130
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 42.9' N ( 32.71500) LONGITUDE: 80° 26.3' W ( -80.43830)
The bench mark is a disk set into the top of a concrete post flush with the
ground, 2.6 km (1.6 mi) southerly along a sand road, set near a lone 24-inch oak
tree in the center of the road, 24.08 m (79.0 ft) WSW of bench mark 6017 H 1984,
8.23 m (27.0 ft) NW of the approximate edge of the marsh, 6.70 m (22.0 ft) SE of
the approximate edge of the marsh, and 3.81 m (12.5 ft) WSW of the lone oak
tree.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8666017 PUBLICATION DATE: 03/09/2004
Name: EDISTO RIVER, SOUTH OF PENNY CREEK
SC
NOAA Chart: 11521 Latitude: 32° 42.9' N ( 32.71500)
USGS Quad: FENWICK Longitude: 80° 26.2' W ( -80.43670)
T I D A L D A T U M S
Tidal datums at EDISTO RIVER, SOUTH OF PENNY CREEK based on:
LENGTH OF SERIES: 4 MONTHS
TIME PERIOD: October 1978 - January 1979
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8666367 WILLTOWN BLUFF
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.669
MEAN HIGH WATER MHW = 1.595
MEAN SEA LEVEL MSL = 0.974
MEAN TIDE LEVEL MTL = 0.838
North American Vertical Datum NAVD88 = 0.704
MEAN LOW WATER MLW = 0.080
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6017 A 1978 2.167 0.572
6017 B 1978 1.713 0.118
6017 D 1978 2.706 1.111
6017 E 1978 2.572 0.977
6017 F 1984 2.472 0.877
6017 H 1984 2.181 0.586
6017 G 1984 2.165 0.570
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8666017 PUBLICATION DATE: 03/09/2004
Name: EDISTO RIVER, SOUTH OF PENNY CREEK
SC
NOAA Chart: 11521 Latitude: 32° 42.9' N ( 32.71500)
USGS Quad: FENWICK Longitude: 80° 26.2' W ( -80.43670)
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.