U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 6
Station ID: 8669691 PUBLICATION DATE: 03/09/2004
Name: DAUFUSKIE LANDING, NEW RIVER
SC
NOAA Chart: 11513 Latitude: 32° 6.2' N ( 32.10330)
USGS Quad: FORT PULASKI Longitude: 80° 53.7' W ( -80.89500)
To reach the tidal bench marks from the east end of the James Byrnes Bridge over
Skull Creek, proceed east and then SW on US Route 278 for 18.5 km (11.5 mi) to a
traffic circle, then 180 degrees around the circle and exit on Greenwood Drive,
proceed 0.5 km (0.3 mi) to Sea Pines Plantation gatehouse, proceed 4.3 km (2.7
mi) SW on Greenwood Drive, enter the traffic circle and proceed around 180
degrees, exit onto Greenwood Drive, proceed 1.8 km (1.1 mi) to South Sea Pines
Drive, travel 2.6 km (1.6 mi) on South Sea Pines Drive to the South Beach
Village, turn right at the marina and proceed to the boat ramp, travel by boat
across Calibogue Cay Sound and then SW to the Cooper River, travel approximately
8 km (4 nm) to Ramshorn Creek, proceed SW 2 km (1 nm) to New River, then travel
1.0 km (0.5 nm) to the public boat dock at Daufuskie Landing. The bench marks
are located along the dirt roads leading from the dock to the store. The tide
gage and staff were located on the SE side of the dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 9691 F 1979
DESIGNATION: 866 9691 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 4684
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2128
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 6.2' N ( 32.10330) LONGITUDE: 80° 53.7' W ( -80.89500)
The primary bench mark is a disk located west of the general store and SW of the
dirt road leading to the dock, 62.79 m (206.0 ft) ESE the east end of the dock,
18.90 m (62.0 ft) WSW of a double trunk oak tree, 7.01 m (23.0 ft) SSW of the
centerline of the dirt road leading to the dock, 5.49 m (18.0 ft) NNE of a wire
fence line, and 3.04 m (10.0 ft) east of the most northeasterly of twin
palmettos. The bench mark is crimped to the top of a stainless steel rod driven
12.8 m (42 ft) to refusal encased in 4-inch PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 6
Station ID: 8669691 PUBLICATION DATE: 03/09/2004
Name: DAUFUSKIE LANDING, NEW RIVER
SC
NOAA Chart: 11513 Latitude: 32° 6.2' N ( 32.10330)
USGS Quad: FORT PULASKI Longitude: 80° 53.7' W ( -80.89500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9691 D 1979
DESIGNATION: 866 9691 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 4682
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2126
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 6.3' N ( 32.10500) LONGITUDE: 80° 53.5' W ( -80.89170)
The bench mark is a disk located on the south side of the NE/SW running dirt
road SE of the general store, 35.97 (118.0 ft) SW of the center of a fence gate,
5.33 m (17.5 ft) SE of the centerline of the sand road, 1.31 m (4.3 ft) south of
powerpole #32477 with a witness sign attached, and 0.15 m (0.5 ft) NW of a wire
fence. The bench mark is crimped to the top of a stainless steel rod driven
11.0 m (36 ft) to refusal and encased in 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 9691 E 1979
DESIGNATION: 866 9691 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 4683
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2125
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 6.4' N ( 32.10670) LONGITUDE: 80° 53.5' W ( -80.89170)
The bench mark is a disk located on the north side of a dirt road running NE/SW,
141.12 m (463.0 ft) SW of a sand road leading SE, 50.29 m (165.0 ft) NNE and
across the road from the center of a metal gate, 12.56 m (41.2 ft) ESE of the
center of a twin oak tree, 6.86 m (22.5 ft) NW of the centerline of the dirt
road, 3.87 m (12.7 ft) SSW of the center of a 1 m (4 ft) diameter live oak tree,
and 0.55 m (1.8 ft) south of a steel witness post. The bench mark is crimped to
the top of a stainless steel rod driven 11.0 m (36 ft) 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 3 of 6
Station ID: 8669691 PUBLICATION DATE: 03/09/2004
Name: DAUFUSKIE LANDING, NEW RIVER
SC
NOAA Chart: 11513 Latitude: 32° 6.2' N ( 32.10330)
USGS Quad: FORT PULASKI Longitude: 80° 53.7' W ( -80.89500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 9691 G 1981
DESIGNATION: 866 9691 G TIDAL
MONUMENTATION: Tidal Station disk VM#: 4685
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2127
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 6.3' N ( 32.10500) LONGITUDE: 80° 53.6' W ( -80.89330)
The bench mark is a disk set flush in a concrete monument located near a
powerpole, 160.02 m (525.0 ft) SE of the landing dock, 24.08 m (79.0 ft) SSE of
the SE corner of the Daufuskie Island co-op general store, 7.01 m (23.0 ft) NNW
of the approximate centerline of the road at a fork in the road, 2.96 m (9.7 ft)
NNW of a power pole with a transformer and a metal witness sign attatched, and
1.49 m (4.9 ft) WSW of a metal fence line, and 0.09 m (0.3 ft) above ground
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 6
Station ID: 8669691 PUBLICATION DATE: 03/09/2004
Name: DAUFUSKIE LANDING, NEW RIVER
SC
NOAA Chart: 11513 Latitude: 32° 6.2' N ( 32.10330)
USGS Quad: FORT PULASKI Longitude: 80° 53.7' W ( -80.89500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING:
DESIGNATION: 866 9691 TIDAL 1
ALIAS: NO STAMPING 1
MONUMENTATION: Tidal Station disk VM#: 4686
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: CK0665
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 6.3' N ( 32.10500) LONGITUDE: 80° 53.6' W ( -80.89330)
The bench mark is set flush in a concrete monument located SE of the dock behind
an abandoned oyster shack, with the designation "NO 1" written in the concrete
which surrounds the disk, 94.49 m (310.0 ft) south of the east end of the
Beaufort County Landing Dock, 21.79 m (71.5 ft) NNW of power pole #S-30, 17.98 m
(59.0 ft) east of a steel retaining wall at the river's edge, 15.64 m (51.3 ft)
SSW of the SE corner of a yellow stucco house, 6.40 m (21.0 ft) east of the SE
corner of a concrete block foundation of a building that has been torn down,
5.79 m (19.0 ft) north of the edge of a clearing, and 0.76 m (2.5 ft) west of a
large 2 m (6 ft) diameter oak tree.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 6
Station ID: 8669691 PUBLICATION DATE: 03/09/2004
Name: DAUFUSKIE LANDING, NEW RIVER
SC
NOAA Chart: 11513 Latitude: 32° 6.2' N ( 32.10330)
USGS Quad: FORT PULASKI Longitude: 80° 53.7' W ( -80.89500)
T I D A L D A T U M S
Tidal datums at DAUFUSKIE LANDING, NEW RIVER based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: September 1979 - August 1980
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8670870 FORT PULASKI, SAVANNAH RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (09/04/1979) = 3.093
MEAN HIGHER HIGH WATER MHHW = 2.316
MEAN HIGH WATER MHW = 2.203
North American Vertical Datum NAVD88 = 1.276
MEAN SEA LEVEL MSL = 1.214
MEAN TIDE LEVEL MTL = 1.134
MEAN LOW WATER MLW = 0.064
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (04/12/1980) = -0.747
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
9691 F 1979 4.724 2.521
9691 D 1979 4.306 2.103
9691 E 1979 4.457 2.254
9691 G 1981 5.066 2.863
866 9691 TIDAL 1 4.736 2.533
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 6
Station ID: 8669691 PUBLICATION DATE: 03/09/2004
Name: DAUFUSKIE LANDING, NEW RIVER
SC
NOAA Chart: 11513 Latitude: 32° 6.2' N ( 32.10330)
USGS Quad: FORT PULASKI Longitude: 80° 53.7' W ( -80.89500)
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.