U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8666167 PUBLICATION DATE: 04/01/2004
Name: HOPE CREEK
SC
NOAA Chart: 11517 Latitude: 32° 42.0' N ( 32.70000)
USGS Quad: FENWICK Longitude: 80° 25.6' W ( -80.42670)
To reach the tidal bench marks from the intersection of U.S. Highway 17 and
State Highway 162, proceed south on State Highway 162 for 17.8 km (11.1 mi) to
State Highway 164, then bear left onto State Highway 164 and travel 3.9 km (2.4
mi) to State Highway 174, then continue through the intersection and continue on
State Highway 174 for 5.1 km (3.2 mi) to the end of the paved road, then
continue on the dirt road for 1.6 km (1.0 mi) to State Road S-10-38, then bear
left past the entrance to Hutton Plantation and travel for 0.5 km (0.3 mi) to
the entrance to Willtown Bluff, then turn left and proceed 0.8 m (0.5 mi) to
Willtown Bluff Boat Landing. By boat, continue 1.4 km (0.9 mi) north on Edisto
River, then 1.0 km (0.6 mi) north on Hope Creek, the more easterly of two small
creeks that enter Edisto River, 1.4 km (0.9 mi) north of the boat landing. The
bench marks are located on an old rice dike. The tide gage and staff were on a
platform 30 m (100 ft) offshore of the west bank of Hope Creek.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6167 A 1978
DESIGNATION: 866 6167 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 4278
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 42.0' N ( 32.70000) LONGITUDE: 80° 25.6' W ( -80.42670)
The primary bench mark is a disk set flush in the top of a concrete monument
located in the center of an old rice field dike at the west end of a 90 degree
bend in the dike where Hope Creek splits into a "T", between two steel witness
posts on either side of the dike, 2.56 m (8.4 ft) south of a witness post, and
2.07 m (6.8 ft) north of a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8666167 PUBLICATION DATE: 04/01/2004
Name: HOPE CREEK
SC
NOAA Chart: 11517 Latitude: 32° 42.0' N ( 32.70000)
USGS Quad: FENWICK Longitude: 80° 25.6' W ( -80.42670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6167 B 1978
DESIGNATION: 866 6167 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 4279
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 42.0' N ( 32.70000) LONGITUDE: 80° 25.6' W ( -80.42670)
The bench mark is a disk set flush in the top of a concrete monument located in
the center of the old rice dike, 57.42 m (188.4 ft) west of bench mark 6167 A
1978, 1.98 m (6.5 ft) north of a witness post, and 1.98 m (6.5 ft) south of a
witness post.
BENCH MARK STAMPING: 6167 C 1978
DESIGNATION: 866 6167 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 4280
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 42.0' N ( 32.70000) LONGITUDE: 80° 25.6' W ( -80.42670)
The bench mark is a disk set flush in the top of a concrete monument located in
hte centr of the old rice dike, 49.04 m (160.9 ft) west of bench mark 6167 B
1978, 2.41 m (7.9 ft) SE of a witness post, and 1.83 m (6.0 ft) NW of a witness
post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8666167 PUBLICATION DATE: 04/01/2004
Name: HOPE CREEK
SC
NOAA Chart: 11517 Latitude: 32° 42.0' N ( 32.70000)
USGS Quad: FENWICK Longitude: 80° 25.6' W ( -80.42670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6167 D 1978
DESIGNATION: 866 6167 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 4281
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 42.0' N ( 32.70000) LONGITUDE: 80° 25.6' W ( -80.42670)
The bench mark is a disk located 57 m (186 ft) SSE of bench mark 6167 A 1978,
42.21 m (138.5 ft) north of bench mark 6167 E 1978, 2.77 m (9.1 ft) west of the
east side of the dike, 2.44 m (8.0 ft) east of the west side of the dike, and
1.86 m (6.1 ft) east of a witness post on the west side of the dike. 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 PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 6167 E 1978
DESIGNATION: 866 6167 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 4282
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 42.0' N ( 32.70000) LONGITUDE: 80° 25.6' W ( -80.42670)
The bench mark is a disk, 3.05 m (10.0 ft) west of the east side of the dike,
2.44 m (8.0 ft) east of the west side of the dike, 2.35 m (7.7 ft) west of a
witness post on the east side of the dike, and 1.77 m (5.8 ft) east of a witness
post on the west side of the dike. 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 PVC pipe
and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8666167 PUBLICATION DATE: 04/01/2004
Name: HOPE CREEK
SC
NOAA Chart: 11517 Latitude: 32° 42.0' N ( 32.70000)
USGS Quad: FENWICK Longitude: 80° 25.6' W ( -80.42670)
T I D A L D A T U M S
Tidal datums at HOPE 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 = 1.864
MEAN HIGH WATER MHW = 1.782
MEAN SEA LEVEL MSL = 1.051
MEAN TIDE LEVEL MTL = 0.926
MEAN LOW WATER MLW = 0.069
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6167 A 1978 2.326 0.544
6167 B 1978 2.435 0.653
6167 C 1978 2.331 0.549
6167 D 1978 1.937 0.155
6167 E 1978 2.194 0.412
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8666167 PUBLICATION DATE: 04/01/2004
Name: HOPE CREEK
SC
NOAA Chart: 11517 Latitude: 32° 42.0' N ( 32.70000)
USGS Quad: FENWICK Longitude: 80° 25.6' W ( -80.42670)
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.