U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8667999 PUBLICATION DATE: 05/01/2003
Name: BEAUFORT
SC
NOAA Chart: 11519 Latitude: 32° 25.8' N ( 32.43000)
USGS Quad: BEAUFORT Longitude: 80° 40.5' W ( -80.67500)
To reach the tidal bench marks from the junction of U.S. 21 Business (Boundary
Street), U.S. Highway 21 (Ribaut Road) and State Road 167 at the NW edge of
Beaufort, go ESE on Highway 21 Business for 2.49 km (1.55 mi) to the junction of
Bay Street, then turn right on Bay Street and proceed for 0.3 km (0.2 mi) to the
junction of State Road 133 (Charles Street) and the Downtown Marina along the
waterfront. The bench marks are located in downtown Beaufort and along the
waterfront. The gage and staff were located on the seawall near the ramp to the
floating docks.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7999 G 1980
DESIGNATION: 866 7999 G TIDAL
MONUMENTATION: Tidal Station disk VM#: 4433
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2243
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 32° 25.8' N ( 32.43000) LONGITUDE: 80° 40.4' W ( -80.67330)
The primary bench mark is a disk located in the Beaufort City Park between the
Pavilion and the covered walkway, just east of the downtown marina office, 26 m
(85.0 ft) NE of the angle in the sea wall, 25.39 m (83.3 ft) NW of the most NW
corner of the Pavilion, 7.99 m (26.2 ft) SE of the covered walkway, and 1.95 m
(6.4 ft) SW of the SW face of the concrete block of the Thomas Heyward, Jr.
monument/memorial. The bench mark is set 9 cm (0.3 ft) below ground level,
crimped to a copper-clad steel rod driven 9.1 m (30 ft) to refusal, and encased
in 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: 8667999 PUBLICATION DATE: 05/01/2003
Name: BEAUFORT
SC
NOAA Chart: 11519 Latitude: 32° 25.8' N ( 32.43000)
USGS Quad: BEAUFORT Longitude: 80° 40.5' W ( -80.67500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 4 1933
DESIGNATION: 866 7999 TIDAL 4
MONUMENTATION: Tidal Station disk VM#: 4430
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: CK0882
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 32° 25.8' N ( 32.43000) LONGITUDE: 80° 40.2' W ( -80.67000)
The bench mark is a disk set flush in the top of the west end of the concrete
and shell composite sea wall on the north side of the Beaufort river and on the
east side of Carteret St. (U.S. Highway 21) , NNE of the north end of the
Richard V. Woods memorial bridge, 36 m (117.0 ft) north of the NE end of the
bridge, 26 m (86.0 ft) south of the centerline of Bay Street, 16.12 m (52.9 ft)
south of a brick monument (WWII memorial), and 12.89 m (42.3 ft) east of the
centerline of Carteret Street.
BENCH MARK STAMPING: NO 7 1973
DESIGNATION: 866 7999 TIDAL 7
MONUMENTATION: Tidal Station disk VM#: 4431
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2244
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 32° 25.8' N ( 32.43000) LONGITUDE: 80° 40.2' W ( -80.67000)
The bench mark is a disk set flush in the top of the concrete and shell
composite sea wall on the north side of teh Beaufort river, on the east side of
Carteret St.(U.S. Highway 21), 47.73 m (156.6 ft) east of the centerline of
Carteret Street, 34.84 m (114.3 ft) ENE of bench mark NO 4 1933, 18 m (58.0 ft)
south of the centerline of Bay Street, 9.57 m (31.4 ft) SW of the most easterly
of two cannons.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8667999 PUBLICATION DATE: 05/01/2003
Name: BEAUFORT
SC
NOAA Chart: 11519 Latitude: 32° 25.8' N ( 32.43000)
USGS Quad: BEAUFORT Longitude: 80° 40.5' W ( -80.67500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 8 1973
DESIGNATION: 866 7999 TIDAL 8
MONUMENTATION: Tidal Station disk VM#: 4432
AGENCY: National Ocean Survey (NOS) IDB PID#: CK2245
SETTING CLASSIFICATION: Concrete sea wall OPUS PID:
LATITUDE: 32° 25.8' N ( 32.43000) LONGITUDE: 80° 40.1' W ( -80.66830)
The bench mark is a disk set flush in the top of the concrete and shell
composite sea wall on the north side of the Beaufort river,on the east side
Carteret St., 84.31 m (276.6 ft) east of the centerline of Carteret Street, 40 m
(131 ft) east of bench mark NO 4 1933, 36.15 m (118.6 ft) ENE of bench mark NO 7
1973, 10.64 m (34.9 ft) south of the centerline of the intersection of Bay
St.and New St., and 5.55 m (18.2 ft) west of the south end of a white picket
fence.
BENCH MARK STAMPING: NO 6
DESIGNATION: 866 7999 TIDAL 6
MONUMENTATION: Bench Mark disk VM#: 4435
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: CK0886
SETTING CLASSIFICATION: Concrete footing OPUS PID:
LATITUDE: 32° 25.9' N ( 32.43170) LONGITUDE: 80° 40.2' W ( -80.67000)
The bench mark is a disk set flush in the concrete footing at the NE corner of
the Micheal Rainey antiques store (old library) on the corner of Carteret and
Craven St., 19.11 m (62.7 ft) west of the centerline of Carteret Street, 8.87 m
(29.1 ft) south of the centerline of Craven Street, and 1.16 m (3.8 ft) west of
the NE corner of the antique store.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8667999 PUBLICATION DATE: 05/01/2003
Name: BEAUFORT
SC
NOAA Chart: 11519 Latitude: 32° 25.8' N ( 32.43000)
USGS Quad: BEAUFORT Longitude: 80° 40.5' W ( -80.67500)
T I D A L D A T U M S
Tidal datums at BEAUFORT based on:
LENGTH OF SERIES: 7 YEARS
TIME PERIOD: January 1978 - December 1984
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 (09/04/1979) = 3.487
MEAN HIGHER HIGH WATER MHHW = 2.432
MEAN HIGH WATER MHW = 2.315
North American Vertical Datum NAVD88 = 1.350
MEAN SEA LEVEL MSL = 1.317
MEAN TIDE LEVEL MTL = 1.190
MEAN LOW WATER MLW = 0.065
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (12/24/1983) = -0.723
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7999 G 1980 3.325 1.010
NO 4 1933 4.281 1.966
NO 7 1973 4.170 1.855
NO 8 1973 4.112 1.797
NO 6 4.039 1.724
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8667999 PUBLICATION DATE: 05/01/2003
Name: BEAUFORT
SC
NOAA Chart: 11519 Latitude: 32° 25.8' N ( 32.43000)
USGS Quad: BEAUFORT Longitude: 80° 40.5' W ( -80.67500)
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.