U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 12/04/1985
Station ID: 8668482 SUPERCEDED DATE: 04/21/2003
Name: BAILEYS LANDING, OKATEE RIVER
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 20.8' N
USGS Quad: RIDGELAND Longitude: 80° 53.4' W
To reach the tidal bench marks from the south end of Broad River Bridge, proceed
5.4 miles (8.7 km) south on State Highway 170 to County Road S-7-18, turn left
and continue south on County Road S-7-18 for 1.7 miles (2.7 km) to a dirt
driveway leading to the Nimmer residence, turn left and proceed 0.1 mile (0.2
km) to the Nimmer residence. The bench marks are located on the river bluff
behind the house, and along the county road. The tide gage and staff were
located on the dock behind the house.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 3
MONUMENTATION: Survey Disk VM#: 4490
AGENCY: PID#: CK0820
SETTING CLASSIFICATION: Concrete Monument
The bench mark is near the river bluff, 79.0 feet (24.1 m) east of Bench Mark O
5 1973, 58.7 feet (17.9 m) SE of the SE corner of the Nimmer residence, 48.3
feet (14.7 m) SW of the NW corner of the Hightown residence, 39.0 feet (11.9 m)
NE of the river bluff, and 34.0 feet (10.4 m) west of the SW corner of the
Hightown residence. The bench mark is at ground level, set flush in a tile pipe
surrounded by concrete.
BENCH MARK STAMPING: O 5 1973
MONUMENTATION: Survey Disk VM#: 4491
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is near the dock, 79.0 feet (24.1 m) west of Bench Mark No 3,
68.0 feet (20.7 m) SE of the brick support stairway of the Nimmer residence,
46.9 feet (14.3 m) SW of the SE corner of the residence, 7.6 feet (2.3 m) east
of the concrete walkway to the dock, and 2.0 feet (0.6 m) north of the river
bluff. The bench mark is set flush in concrete at ground level. Note: The mark
is badly scarred and the N is obliterated from the original stamping.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
PUBLICATION DATE: 12/04/1985
Station ID: 8668482 SUPERCEDED DATE: 04/21/2003
Name: BAILEYS LANDING, OKATEE RIVER
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 20.8' N
USGS Quad: RIDGELAND Longitude: 80° 53.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8482 D 1978
MONUMENTATION: Survey Disk VM#: 4492
AGENCY: PID#: CK2144
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is beside the dirt driveway just west of the Nimmer driveway,
337.0 feet (102.7 m) NNW of Bench Mark No 3, 276.0 feet (84.1 m) SE of Bench
Mark 8482 E 1978, 34.5 feet (10.5 m) south of the centerline of County Road
S-7-18, 28.0 feet (8.5 m) north of a 2-foot (0.6 m) diameter oak tree, and 12.0
feet (3.7 m) east of the centerline of a dirt driveway. The bench mark is at
ground level, crimped to a galvanized steel rod driven 23 feet (7 m) to refusal,
and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 8482 E 1978
MONUMENTATION: Survey Disk VM#: 4493
AGENCY: PID#: CK2143
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is along the county road west of Bench Mark 8482 D 1978 near a
white concrete driveway marker, 300.0 feet (91.4 m) north of Bench Mark Pinckney
No 4 1957, 78.0 feet (23.8 m) north of a multi-trunk oak tree, 30.5 feet (9.3 m)
north of telephone junction box #RP6R3, 27.5 feet (8.4 m) west of the centerline
of the road, 17.0 feet (5.2 m) east of the corner of a wire mesh fence, and 17.0
feet (5.2 m) south of a dirt driveway to the Okatee River Estates. The bench
mark is at ground level, crimped to a galvanized steel rod driven 32 feet (10 m)
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 5
PUBLICATION DATE: 12/04/1985
Station ID: 8668482 SUPERCEDED DATE: 04/21/2003
Name: BAILEYS LANDING, OKATEE RIVER
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 20.8' N
USGS Quad: RIDGELAND Longitude: 80° 53.4' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 8482 F 1978
MONUMENTATION: Survey Disk VM#: 4494
AGENCY: PID#: CK2142
SETTING CLASSIFICATION: Galvanized Steel Rod
The bench mark is near an old pecan orchard 0.1 mile (0.2 km) west of the Nimmer
driveway, 314.0 feet (95.7 m) north of Bench Mark 8482 E 1978, 33.0 feet (10.1
m) south of the centerline of a dirt driveway, 32.0 feet (9.8 m) west of the
centerline of the county road, and 8.0 feet (2.4 m) south of a 2-foot (0.6 m)
diameter pecan tree. The bench mark is at ground level, crimped to a galvanized
steel rod driven 23 feet (7 m) to refusal, and encased in a PVC pipe and
concrete kickblock.
BENCH MARK STAMPING: PINCKNEY NO 4 1957
MONUMENTATION: Survey Disk VM#: 4495
AGENCY: PID#: CK0816
SETTING CLASSIFICATION: Concrete Monument
The bench mark is 300.0 feet (91.4 m) south of Bench Mark 8482 E 1978, 40.0 feet
(12.2 m) east of the centerline of a dirt driveway leading to a pond dike, 14.0
feet (4.3 m) west of a wire mesh fence, and 4.2 feet (1.3 m) north of a 4-foot
(1.2 m) diameter live oak tree. The bench mark is 0.2 foot (0.1 m) above ground
level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 12/04/1985
Station ID: 8668482 SUPERCEDED DATE: 04/21/2003
Name: BAILEYS LANDING, OKATEE RIVER
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 20.8' N
USGS Quad: RIDGELAND Longitude: 80° 53.4' W
T I D A L D A T U M S
Tidal datums at BAILEYS LANDING, OKATEE RIVER based on:
LENGTH OF SERIES: 12 MONTHS
TIME PERIOD: MARCH 1978-FEBRUARY 1979
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8667999 BEAUFORT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (07/19/1978) = 10.97
MEAN HIGHER HIGH WATER MHHW = 8.77
MEAN HIGH WATER MHW = 8.37
MEAN TIDE LEVEL MTL = 4.30
MEAN LOW WATER MLW = 0.22
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (01/29/1979) = -2.80
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 3 25.97 17.60
O 5 1973 26.14 17.77
8482 D 1978 25.93 17.56
8482 E 1978 26.27 17.90
8482 F 1978 25.83 17.46
PINCKNEY NO 4 1957 25.05 16.68
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 12/04/1985
Station ID: 8668482 SUPERCEDED DATE: 04/21/2003
Name: BAILEYS LANDING, OKATEE RIVER
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 20.8' N
USGS Quad: RIDGELAND Longitude: 80° 53.4' W
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 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.