U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
PUBLICATION DATE: 10/26/1987
Station ID: 8667776 SUPERCEDED DATE: 04/21/2003
Name: SALVESBARG LANDING, WEST BRANCH BOYD CREEK
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 28.5' N
USGS Quad: LAUREL BAY Longitude: 80° 51.0' W
To reach the tidal bench marks from Interstate 95 in Jasper County, take exit 28
to the intersection of State Highway 462, proceed south (left) on State Highway
462 for 8.5 miles (13.7 km), turn left onto Salvesbarg Road (a dirt road) and
continue east for 2.8 miles (4.5 km) to Salvesbarg Landing. The bench marks are
along the dirt road leading to the boat landing. The tide gage and staff were
located on a platform just upstream from the boat ramp.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7776 A 1979
MONUMENTATION: Survey Disk VM#: 4390
AGENCY: PID#: CK1913
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is NW of the boat ramp, 48.0 feet (14.6 m) NE of a 2.3-foot (0.7
m) diameter pine tree, 32.2 feet (9.8 m) SE of a concrete property corner, 15.7
feet (4.8 m) SW of the edge of the bluff, 15.0 feet (4.6 m) NW of 2.3-foot (0.7
m) diameter pine tree to the left of the boat ramp, and 2.6 feet (0.8 m) west of
a witness post. The bench mark is 0.1 foot (0.03 m) below ground level, crimped
to a stainless steel rod driven 30 feet (9 m) to refusal, and encased in a
4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7776 C 1979
MONUMENTATION: Survey Disk VM#: 4391
AGENCY: PID#: CK1915
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is near the entrance to a cornfield on the SE side of the road,
83.7 feet (25.5 m) NNW of a utility pole, 41.2 feet (12.6 m) ENE of a 5-foot
(1.5 m) diameter oak tree, 27.0 feet (8.2 m) SE of the centerline of the road
leading to the landing, and 3.6 feet (1.1 m) NW of a witness post. The bench
mark is 0.2 foot (0.1 m) below ground level, crimped to a stainless steel rod
driven 24 feet (7 m) 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 2 of 5
PUBLICATION DATE: 10/26/1987
Station ID: 8667776 SUPERCEDED DATE: 04/21/2003
Name: SALVESBARG LANDING, WEST BRANCH BOYD CREEK
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 28.5' N
USGS Quad: LAUREL BAY Longitude: 80° 51.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7776 E 1979
MONUMENTATION: Survey Disk VM#: 4392
AGENCY: PID#: CK1912
SETTING CLASSIFICATION: Stainless Steel Rod
The bench mark is on the north side of the road leading to the landing, 29.8
feet (9.1 m) ESE of a driveway leading to a private residence and pool, 15.6
feet (4.8 m) NW of the road leading to the boat ramp, 15.2 feet (4.6 m) east of
a 2.5-foot (0.8 m) diameter pine tree, 11.2 feet (3.4 m) SE of telephone cable
junction box #RP 11689, and 5.3 feet (1.6 m) SW of a witness post. The bench
mark is crimped to a stainless steel rod driven to refusal, and encased in
4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7776 F 1981
MONUMENTATION: Survey Disk VM#: 4393
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set flush in a concrete monument, 40.1 feet (12.2 m) NE of the
easternmost wooden support of the RYAN sign, 23.5 feet (7.2 m) NNW of the
centerline of the road leading to the landing, 13.3 feet (4.1 m) NW of the
northern face of a double-trunked oak tree, 2.3 feet (0.7 m) south of a witness
post, and at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
PUBLICATION DATE: 10/26/1987
Station ID: 8667776 SUPERCEDED DATE: 04/21/2003
Name: SALVESBARG LANDING, WEST BRANCH BOYD CREEK
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 28.5' N
USGS Quad: LAUREL BAY Longitude: 80° 51.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7776 G 1981
MONUMENTATION: Survey Disk VM#: 4394
AGENCY: PID:
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set flush in a concrete monument, 203.0 feet (61.9 m) SW of
the centerline of the dirt driveway leading NNE to the Cox residence, 26.0 feet
(7.9 m) SSE of the centerline of the road leading to the landing, 14.7 feet (4.5
m) WNW of a 1.7-foot (0.5 m) diameter pine tree, 7.1 feet (2.2 m) NNE of a
0.9-foot (0.3 m) diameter gum tree, 2.7 feet (0.8 m) NW of a witness post, and
at ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
PUBLICATION DATE: 10/26/1987
Station ID: 8667776 SUPERCEDED DATE: 04/21/2003
Name: SALVESBARG LANDING, WEST BRANCH BOYD CREEK
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 28.5' N
USGS Quad: LAUREL BAY Longitude: 80° 51.0' W
T I D A L D A T U M S
Tidal datums at SALVESBARG LANDING, WEST BRANCH BOYD CREEK based on:
LENGTH OF SERIES: 12 MONTHS
TIME PERIOD: SEPTEMBER 1979-AUGUST 1980
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8667999 BEAUFORT
Elevations of tidal datums referred to Mean High Water (MHW), in FEET:
HIGHEST OBSERVED WATER LEVEL (09/04/1979) = 4.45
MEAN HIGHER HIGH WATER MHHW = 0.36
MEAN HIGH WATER MHW = 0.00
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MHW
7776 A 1979 7.17
7776 C 1979 7.20
7776 E 1979 6.34
7776 F 1981 6.59
7776 G 1981 5.32
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
PUBLICATION DATE: 10/26/1987
Station ID: 8667776 SUPERCEDED DATE: 04/21/2003
Name: SALVESBARG LANDING, WEST BRANCH BOYD CREEK
SOUTH CAROLINA
NOAA Chart: 11513 Latitude: 32° 28.5' N
USGS Quad: LAUREL BAY Longitude: 80° 51.0' 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.