U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8667199 PUBLICATION DATE: 02/05/2004
Name: WIMBEE CREEK
SC
NOAA Chart: 11519 Latitude: 32° 34.7' N ( 32.57830)
USGS Quad: GREEN POND Longitude: 80° 40.2' W ( -80.67000)
To reach the bench marks from the Post Office in Dale, proceed north on County
Road S-7-43 for 1.6 km (1.0 mi), then east along a sand road for 2.4 km (1.5 mi)
to the Beaufort County boat ramp and adjacent parking lot. The bench marks are
around the perimeter of the parking lot and on the concrete abutment of the
abandoned railroad bridge. The tide station was on the abandoned railroad
bridge presently used as a fishing pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7199 B 1977
DESIGNATION: 866 7199 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 11642
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2260
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 34.7' N ( 32.57830) LONGITUDE: 80° 40.2' W ( -80.67000)
The primary bench mark is a disk located near the concrete steps leading up from
the boat ramp parking lot to the pier, 15.54 m (51.0 ft) south of the centerline
of the boat ramp, 3.90 m (12.8 ft) NNE of the centerline of the concrete steps
and 3.84 m (12.6 ft) NW of a utility pole with a juction box and a witness sign.
The bench mark is set at ground level, crimped to the top of a 5/8-inch
galvanized steel rod driven 11.3 m (37 ft) 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
Station ID: 8667199 PUBLICATION DATE: 02/05/2004
Name: WIMBEE CREEK
SC
NOAA Chart: 11519 Latitude: 32° 34.7' N ( 32.57830)
USGS Quad: GREEN POND Longitude: 80° 40.2' W ( -80.67000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7199 A 1977
DESIGNATION: 866 7199 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 11641
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2261
SETTING CLASSIFICATION: Concrete dock abutment OPUS PID:
LATITUDE: 32° 34.6' N ( 32.57670) LONGITUDE: 80° 40.2' W ( -80.67000)
The bench mark is a disk set in the concrete dock abutement at the north end of
the west side of the pier, 7.59 m (24.9 ft) west of the first metal light pole
on the west side of the pier, 2.44 m (8.0 ft) NNW of the centerline of the
concrete steps, and 0.82 m (2.7 ft) SSW of the north end of the abutment at the
west end of the pier.
BENCH MARK STAMPING: 7199 C 1977
DESIGNATION: 866 7199 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 11643
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2259
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 34.7' N ( 32.57830) LONGITUDE: 80° 40.3' W ( -80.67170)
The bench mark is a disk located in the parking lot for the boat ramp, 47.85 m
(157.0 ft) west of bench mark 7199 B 1977, 30.48 m (100.0 ft) WSW of the west
bank of the river, 5.18 m (17.0 ft) north of the centerline of the dirt road
leading to the boad ramp, and 0.37 m (1.2 ft) SSE of a metal witness post. The
bench mark is set at ground level, crimped to the top of a 5/8-inch galvanized
steel rod driven 11.3 m (37 ft) 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 3 of 5
Station ID: 8667199 PUBLICATION DATE: 02/05/2004
Name: WIMBEE CREEK
SC
NOAA Chart: 11519 Latitude: 32° 34.7' N ( 32.57830)
USGS Quad: GREEN POND Longitude: 80° 40.2' W ( -80.67000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7199 D 1977
DESIGNATION: 866 7199 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 11644
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2262
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 34.7' N ( 32.57830) LONGITUDE: 80° 40.3' W ( -80.67170)
The bench mark is a disk located in the parking lot for the boat ramp and
fishing pier, 18.90 m (62.0 ft) SSE of the centerline of the dirt road leading
to the boat ramp, 2.65 m (8.7 ft) ENE of power pole #185204, and 0.85 m (2.8 ft)
SE of a witness post. The bench mark is set at ground level, crimped to the top
of a 5/8-inch galvanized steel rod driven 7.0 m (23 ft) to refusal, and encased
in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7199 F 1982
DESIGNATION: 866 7199 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 11645
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2258
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 34.6' N ( 32.57670) LONGITUDE: 80° 40.4' W ( -80.67330)
The bench mark is a disk set flush in the top of a concrete monument located
along the dirt road leading to the boat ramp, 5.79 m (19.0 ft) SSE of the
centerline of the dirt road, 4.08 m (13.4 ft) WNW of a 0.15 m (0.5 ft) diameter
pine tree, and 0.79 m (2.6 ft) north of a metal witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8667199 PUBLICATION DATE: 02/05/2004
Name: WIMBEE CREEK
SC
NOAA Chart: 11519 Latitude: 32° 34.7' N ( 32.57830)
USGS Quad: GREEN POND Longitude: 80° 40.2' W ( -80.67000)
T I D A L D A T U M S
Tidal datums at WIMBEE CREEK based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: December 1977 - November 1978
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:
HIGHEST OBSERVED WATER LEVEL (03/09/1978) = 2.431
MEAN HIGHER HIGH WATER MHHW = 2.110
MEAN HIGH WATER MHW = 2.013
MEAN SEA LEVEL MSL = 1.197
North American Vertical Datum NAVD88 = 1.174
MEAN TIDE LEVEL MTL = 1.039
MEAN LOW WATER MLW = 0.065
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/09/1978) = -0.830
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7199 B 1977 3.022 1.009
7199 A 1977 5.843 3.830
7199 C 1977 2.304 0.290
7199 D 1977 2.580 0.567
7199 F 1982 2.364 0.351
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8667199 PUBLICATION DATE: 02/05/2004
Name: WIMBEE CREEK
SC
NOAA Chart: 11519 Latitude: 32° 34.7' N ( 32.57830)
USGS Quad: GREEN POND Longitude: 80° 40.2' W ( -80.67000)
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.