U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8662953 PUBLICATION DATE: 10/30/2003
Name: WINDSOR PLANTATION, BLACK RIVER
SC
NOAA Chart: 11534 Latitude: 33° 24.9' N ( 33.41500)
USGS Quad: WAVERLY MILLS Longitude: 79° 15.0' W ( -79.25000)
To reach the tidal bench marks from the junction of U.S. Highways 701, 17 and 17
Alternate (Church Street) in Georgetown, proceed north on U.S. Highway 701
(North Fraser Street) for 4.8 km (3.0 mi) to State Road 325 (Wedgefield Road),
then turn right and go ENE on State Road 325 for 2.01 km (1.25 mi) to State Road
489 (Windsor Ave), then SE on State Road 489 for 1.53 km (0.95 mi) to State Road
512 (Roberts Road). The bench marks are along State Road 512 east of State Road
489. The tide gage and staff were on a dock at Dr. Tillers residence, about 91
m (300 ft) south of State Road 512.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: WINDSOR NO 2 1934
DESIGNATION: 866 2953 WINDSOR TIDAL 2
MONUMENTATION: Reference Mark disk VM#: 3968
AGENCY: U.S. Coastal and Geodetic Survey
(USC&GS) IDB PID#: DD4410
SETTING CLASSIFICATION: Concete monument OPUS PID:
LATITUDE: 32° 24.9' N ( 32.41500) LONGITUDE: 79° 15.0' W ( -79.25000)
The primary bench mark is a disk set in a concrete monument near an L-shaped
dock, about 0.40 km (0.25 mi) east of State Road 489 (Windsor Avenue), 61 m (200
ft) SE of State Road 512 (Roberts Road), 32 m (105 ft) SW of a boat ramp, 15 m
(50 ft) NW of the end of the L shaped dock, 5 m (18 ft) NW of the approximate
high water line, and 0.06 m (0.2 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8662953 PUBLICATION DATE: 10/30/2003
Name: WINDSOR PLANTATION, BLACK RIVER
SC
NOAA Chart: 11534 Latitude: 33° 24.9' N ( 33.41500)
USGS Quad: WAVERLY MILLS Longitude: 79° 15.0' W ( -79.25000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: WINDSOR NO 3 1934
DESIGNATION: WINDSOR RM 3
MONUMENTATION: Reference Mark disk VM#: 3969
AGENCY: U.S. Coastal and Geodetic Survey
(USC&GS) IDB PID#: DD2195
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 33° 25.0' N ( 33.41670) LONGITUDE: 79° 15.0' W ( -79.25000)
The bench mark is a disk set in a concrete monument along State Road 512
(Roberts Road), about 0.32 km (0.20 mi) east of the intersection with State Road
489 (Windsor Avenue), 12.59 m (41.3 ft) SW of the SE corner of a large barn, 12
m (40 ft) NNW of State Road 512, 3.32 m (10.9 ft) of a fence, 2.19 m (7.2 ft)
south of the south side of the barn, 0.30 m (1.0 ft) SW of a metal witness post
with sign, and 0.12 m (0.4 ft) above the ground.
BENCH MARK STAMPING: 2953 C 1977
DESIGNATION: 866 2953 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 3970
AGENCY: National Ocean Survey (NOS) IDB PID#: DD2192
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 33° 25.0' N ( 33.41670) LONGITUDE: 79° 15.1' W ( -79.25170)
The bench mark is a disk located in a vacant lot along State Road 512 (Roberts
Road), about 0.08 km (0.05 mi) east of the intersection with State Road 489,
37.49 m (123.0 ft) WSW of utility pole #3365, M 35.30 m (115.8 ft) SW of the SW
corner of a house, 14.51 m (47.6 ft) west of the centerline of a driveway, and
7.32 m (24.0 ft) north of the centerline of State Road 512. The bench mark is
at ground level, crimped to the top of a copper-clad steel rod driven 9 m (28
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: 8662953 PUBLICATION DATE: 10/30/2003
Name: WINDSOR PLANTATION, BLACK RIVER
SC
NOAA Chart: 11534 Latitude: 33° 24.9' N ( 33.41500)
USGS Quad: WAVERLY MILLS Longitude: 79° 15.0' W ( -79.25000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 2953 D 1977
DESIGNATION: 866 2953 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 3971
AGENCY: National Ocean Survey (NOS) IDB PID#: DD2193
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 33° 25.0' N ( 33.41670) LONGITUDE: 79° 15.0' W ( -79.25000)
The bench mark is a disk located along State Road 512 (Roberts Road), about 0.24
km (0.15 mi) east of the intersection with State Road 489, 10.00 m (32.8 ft) NNW
of the centerline of State Road 512, 5.09 m (16.7 ft) ENE of the centerline of a
dirt road leading NW, 2.32 m (7.6 ft) NW of a wooden post with sign CAUTION
CHILDREN PLAYING, 1.58 m (5.2 ft) NW of utility pole #FL-65 2-6573, and 1.55 m
(5.1 ft) west of a wooden fence corner post with gate. The bench mark is at
ground level, crimped to the top of a copper-clad steel rod driven 11.0 m (36
ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 2953 E 1977
DESIGNATION: 866 2953 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 3972
AGENCY: National Ocean Survey (NOS) IDB PID#: DD2196
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 33° 25.0' N ( 33.41670) LONGITUDE: 79° 14.9' W ( -79.24830)
The bench mark is a disk located along State Road 512 (Roberts Road), about 0.40
m (0.25 mi) east of the intersection with State Road 489 (Windsor Avenue), 19.99
m (65.6 ft) WNW of the west corner of the garage of a house, 18.35 m (60.2 ft)
ESE of a 1.28 m (4.2 ft) diameter live oak tree, 6.74 m (22.1 ft) SE of the
centerline of State Road 512, and 5.30 m (17.4 ft) WSW of the WSW edge of the
concrete drive leading to a house. The bench mark is at ground level, crimped
to the top of a copper-clad steel rod driven 9.1 m (30 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 4 of 5
Station ID: 8662953 PUBLICATION DATE: 10/30/2003
Name: WINDSOR PLANTATION, BLACK RIVER
SC
NOAA Chart: 11534 Latitude: 33° 24.9' N ( 33.41500)
USGS Quad: WAVERLY MILLS Longitude: 79° 15.0' W ( -79.25000)
T I D A L D A T U M S
Tidal datums at WINDSOR PLANTATION, BLACK RIVER based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: October 1975 - September 1976
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 (08/20/1976) = 1.448
MEAN HIGHER HIGH WATER MHHW = 1.159
MEAN HIGH WATER MHW = 1.092
MEAN SEA LEVEL MSL = 0.596
North American Vertical Datum NAVD88 = 0.596
MEAN TIDE LEVEL MTL = 0.568
MEAN LOW WATER MLW = 0.043
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/01/1976) = -0.482
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
WINDSOR NO 2 1934 1.673 0.581
WINDSOR NO 3 1934 3.021 1.929
2953 C 1977 2.702 1.610
2953 D 1977 3.275 2.183
2953 E 1977 2.001 0.909
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8662953 PUBLICATION DATE: 10/30/2003
Name: WINDSOR PLANTATION, BLACK RIVER
SC
NOAA Chart: 11534 Latitude: 33° 24.9' N ( 33.41500)
USGS Quad: WAVERLY MILLS Longitude: 79° 15.0' W ( -79.25000)
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.