U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 10
Station ID: 8667630 PUBLICATION DATE: 05/06/2003
Name: EDISTO BEACH, EDISTO ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 30.1' N ( 32.50170)
USGS Quad: EDISTO ISLAND Longitude: 80° 17.8' W ( -80.29670)
To reach the tidal bench marks from the intersection of Interstate 26 and U.S.
Highway 17, proceed south on U.S. 17 for approximately 41.8 km (26.0 mi) to
Highway 174, travel south on Highway 174 for approximately 32.2 km (20.0 mi) to
Edisto Beach and the Collins Restaurant at the inshore end of the pier. The
bench marks are located along the road that runs between the Collins Restaurant
to the bath house and the shore. The pressure tide gage was located in the
pavilion next to the Collins Restaurant, with the tubing running along the
pilings of the old pier to the orifice on the piling off shore, and the staff
was attached to a piling.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: PAVILION 1963
DESIGNATION: 866 7630 PAVILION
MONUMENTATION: Triangulation Station disk VM#: 6964
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: CK1806
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 30.3' N ( 32.50500) LONGITUDE: 80° 17.7' W ( -80.29500)
The primary bench mark is a disk set in a concrete post in Edisto Beach State
Park approximately 0.2 km (0.1 mi) north of Collins Edisto Beach Pier on the
ocean side of the old park pavilion and bathhouse, 22.19 m (72.8 ft) south of
the northern corner of bathhouse and Trading Post Building, 21.12 m (69.3 ft)
east of bench mark PAVILION NO 2 1963, 19.05 m (62.5 ft) SW of bench mark
PAVILION 1 1963, bathhouse, 8.53 m (28.0 ft) SE of the center of the bottom
brick step of the bathhouse porch, 3.99 m (13.1 ft) SSE of the east corner of
the building, and is on a 0.3 m (1 ft) square post, approximately 0.15 m (0.5
ft) below ground level.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 10
Station ID: 8667630 PUBLICATION DATE: 05/06/2003
Name: EDISTO BEACH, EDISTO ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 30.1' N ( 32.50170)
USGS Quad: EDISTO ISLAND Longitude: 80° 17.8' W ( -80.29670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PAVILION NO 2 1963
DESIGNATION: PAVILION RM 2
MONUMENTATION: Reference Mark disk VM#: 6965
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: CK1807
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 30.3' N ( 32.50500) LONGITUDE: 80° 17.7' W ( -80.29500)
The bench mark is a disk set in a concrete post in Edisto Beach Park on the
seaward side of the Trading Post/Bathhouse Building, 15.03 m (49.3 ft) SSW of
the southern porch corner post, 13.23 m (43.4 ft) east of aluminum light pole
next to Putt Golf Course, 7.68 m (25.2 ft) NNE of center of shuffle board court,
4.91 m (16.1 ft) SSE of oceanside southern corner of Trading Post/Bathhhouse,
and 0.91 m (3.0 ft) SE of an 8-inch palmetto tree.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 10
Station ID: 8667630 PUBLICATION DATE: 05/06/2003
Name: EDISTO BEACH, EDISTO ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 30.1' N ( 32.50170)
USGS Quad: EDISTO ISLAND Longitude: 80° 17.8' W ( -80.29670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: PAVILION NO 1 1963
DESIGNATION: PAVILION RM 1
MONUMENTATION: Reference Mark disk VM#: 6966
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: CK1805
SETTING CLASSIFICATION: Concrete monument OPUS PID:
LATITUDE: 32° 30.3' N ( 32.50500) LONGITUDE: 80° 17.7' W ( -80.29500)
The bench mark is a disk set in a concrete post in the Edisto Beach Park on the
seaward side of the Trading Post/Bathhouse Building, 19.05 m (62.5 ft) NE of
bench mark PAVILION 1963, 17.28 m (56.7 ft) east of the center of the top step
leading to Trading Post/Bathhouse Building, 12.13 m (39.8 ft) NE of the ESE
corner of brick steps, 4 m (13 ft) south of east corner of Trading
Post/Bathhouse Building, 1.28 m (4.2 ft) west of a 0.30 m (1.0 ft) diameter
palmetto tree which is 4.63 m (15.2 ft) SE of east corner of Trading
Post/Bathhouse Building, and 0.03 m (0.1 ft) below ground level. NOTE: The
bench mark was originally stamped NO 3 1963 and has been restamped with 3
crossed over, and has a 0 next to the cross over.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 10
Station ID: 8667630 PUBLICATION DATE: 05/06/2003
Name: EDISTO BEACH, EDISTO ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 30.1' N ( 32.50170)
USGS Quad: EDISTO ISLAND Longitude: 80° 17.8' W ( -80.29670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 5 1966
DESIGNATION: 866 7630 TIDAL 5
MONUMENTATION: Tidal Station disk VM#: 6967
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: CK1804
SETTING CLASSIFICATION: Brick step OPUS PID:
LATITUDE: 32° 30.3' N ( 32.50500) LONGITUDE: 80° 17.7' W ( -80.29500)
The bench mark is a disk set flush in the SW corner of the brick steps on the
west side of the Trading Post/Bathhouse in Edisto Beach Park, 14.51 m (47.6 ft)
NE of the southern corner of the west side of Trading Post/Bathhouse, 14.02 m
(46.0 ft) SE of telephone booth in the middle of circular driveway, 4.79 m (15.7
ft) SW of steps leading into the west side of Trading Post/Bathhouse, 0.88 m
(2.9 ft) SE of the NW edge of the steps, 0.46 m (1.5 ft) NE of the SW edge of
the steps, and 0.6 m (2 ft) above ground level.
BENCH MARK STAMPING: NO 6 1966
DESIGNATION: 866 7630 TIDAL 6
MONUMENTATION: Tidal Station disk VM#: 6968
AGENCY: US Coast and Geodetic Survey
(USC&GS) IDB PID#: CK1801
SETTING CLASSIFICATION: Brick step OPUS PID:
LATITUDE: 32° 30.2' N ( 32.50330) LONGITUDE: 80° 17.8' W ( -80.29670)
The bench mark is a disk set flush in the bottom brick step of the entrance
walkway to Edisto Beach State Park near the gate house, 25.73 m (84.4 ft) ENE of
the centerline of Highway 174 and centered between the seaward pillar of the
parks gatehouse, 4.33 m (14.2 ft) south of the centerline of the east-leading
entrance road to the park, 0.73 m (2.4 ft) SE of the SE corner post of the
driveway into the park.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 10
Station ID: 8667630 PUBLICATION DATE: 05/06/2003
Name: EDISTO BEACH, EDISTO ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 30.1' N ( 32.50170)
USGS Quad: EDISTO ISLAND Longitude: 80° 17.8' W ( -80.29670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 7 1971
DESIGNATION: 866 7630 TIDAL 7
MONUMENTATION: Tidal Station disk VM#: 6969
AGENCY: National Ocean Survey (NOS) IDB PID#: CK1808
SETTING CLASSIFICATION: Wooden piling OPUS PID:
LATITUDE: 32° 30.2' N ( 32.50330) LONGITUDE: 81° 17.7' W ( -81.29500)
The bench mark is a disk located in the top of a wooden piling on the south side
of the first groin north of Edisto Pier, 109.03 m (357.7 ft) ENE of the east
corner of the Collins Pavilion building, 93.88 m (308.0 ft) SSE of the south
corner of the restroom building at Edisto Beach State Park, and 21.95 m (72.0
ft) from the seaward end of the groin to the north of the fishing pier at
Collins Pavilion.
BENCH MARK STAMPING: NO 9 1973
DESIGNATION: 866 7630 TIDAL 9
MONUMENTATION: Tidal Station disk VM#: 6970
AGENCY: National Ocean Survey (NOS) IDB PID#: CK1803
SETTING CLASSIFICATION: Concrete floor OPUS PID:
LATITUDE: 32° 30.3' N ( 32.50500) LONGITUDE: 80° 17.8' W ( -80.29670)
The bench mark is a disk set flush in the concrete floor in the SW corner of a
covered picnic area, 91 m (300 ft) NW of bench mark NO 7 1971, 77.72 m (255.0
ft) east of bench mark NO 6 1976, 68.58 m (225.0 ft) NE of main entrance gate of
Edisto State Park, 33.53 m (110.0 ft) SE of the women's restrooms in the park,
0.67 m (2.2 ft) east of the west edge of the sheltered floor of the picnic area,
and 0.58 m (1.9 ft) north of the south edge of the sheltered floor of the picnic
area.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 6 of 10
Station ID: 8667630 PUBLICATION DATE: 05/06/2003
Name: EDISTO BEACH, EDISTO ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 30.1' N ( 32.50170)
USGS Quad: EDISTO ISLAND Longitude: 80° 17.8' W ( -80.29670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7630 H 1976
DESIGNATION: 866 7630 H TIDAL
MONUMENTATION: Tidal Station disk VM#: 6971
AGENCY: National Ocean Service (NOS) IDB PID#: CK1810
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 32° 30.2' N ( 32.50330) LONGITUDE: 80° 17.8' W ( -80.29670)
The bench mark is a disk located 16.58 m (54.4 ft) NNE of centerline of Highway
174 at a curve in the highway, 14.84 m (48.7 ft) SSE of power pole #213623, 8.93
m (29.3 ft) north of power pole #122062, 2.80 m (9.2 ft) east of a wire fence
running parallel to the road and 0.3 m (1 ft) above road level. The bench mark
is crimped to a copper-clad steel rod driven 12.2 m (40 ft) to refusal and
encased in 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7630 L 1981
DESIGNATION: 866 7630 L
MONUMENTATION: Tidal Station disk VM#: 6972
AGENCY: National Ocean Service (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 30.2' N ( 32.50330) LONGITUDE: 80° 17.8' W ( -80.29670)
The bench mark is a disk located 42 m (137 ft) east of power pole #252145, 21.61
m (70.9 ft) NW of the south corner of Collins Avenue Pavilion and Restaurant,
19.23 m (63.1 ft) SE of the centerline of Highway 174, and 0.43 m (1.4 ft) west
of the west corner of the restaurant. The bench mark is crimped to a stainless
steel rod driven 12.2 m (40 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 7 of 10
Station ID: 8667630 PUBLICATION DATE: 05/06/2003
Name: EDISTO BEACH, EDISTO ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 30.1' N ( 32.50170)
USGS Quad: EDISTO ISLAND Longitude: 80° 17.8' W ( -80.29670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7630 M 1981
DESIGNATION: 866 7630 M
MONUMENTATION: Tidal Station disk VM#: 6973
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 30.2' N ( 32.50330) LONGITUDE: 80° 17.8' W ( -80.29670)
The bench mark is a disk located 41.30 m (135.5 ft) south of power pole #122062,
14.57 m (47.8) north of the east corner of Collins Pavilion and Restaurant, 7.92
m (26.0 ft) SE of the north corner of the restaurant, 2.38 m (7.8 ft) NE of the
east side of the restaurant, and 0.06 m (0.2 ft) above ground level. The bench
mark is crimped to a stainless steel rod driven 13.4 m (44 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 8 of 10
Station ID: 8667630 PUBLICATION DATE: 05/06/2003
Name: EDISTO BEACH, EDISTO ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 30.1' N ( 32.50170)
USGS Quad: EDISTO ISLAND Longitude: 80° 17.8' W ( -80.29670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: F 137 1979
DESIGNATION: F 137
MONUMENTATION: Flange-encased Rod VM#: 6974
AGENCY: National Geodetic Survey (NGS) IDB PID#: CK1802
SETTING CLASSIFICATION: Stainless steel rod OPUS PID:
LATITUDE: 32° 30.2' N ( 32.50330) LONGITUDE: 80° 17.8' W ( -80.29670)
The bench mark is a flange-encased rod located 18.75 m (61.5 ft) NE of the
centerline of Highway 174, 15.73 m (51.6 ft) SE of the centerline of road
leading into Edisto Beach State Park, 8.35 m (27.4 ft) south of the south corner
of the State Park Office, and 0.40 m (1.3 ft) south of the south post supporting
the State Park sign. The datum point is set at ground level, being the top of a
stainless steel rod driven 17.7 m (58 ft) to refusal, and encased in an NGS logo
cap.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 9 of 10
Station ID: 8667630 PUBLICATION DATE: 05/06/2003
Name: EDISTO BEACH, EDISTO ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 30.1' N ( 32.50170)
USGS Quad: EDISTO ISLAND Longitude: 80° 17.8' W ( -80.29670)
T I D A L D A T U M S
Tidal datums at EDISTO BEACH, EDISTO ISLAND based on:
LENGTH OF SERIES: 24 MONTHS
TIME PERIOD: May 1977 - April 1979
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 (06/01/1977) = 2.544
MEAN HIGHER HIGH WATER MHHW = 1.934
MEAN HIGH WATER MHW = 1.815
North American Vertical Datum NAVD88 = 1.059
MEAN SEA LEVEL MSL = 0.963
MEAN TIDE LEVEL MTL = 0.939
MEAN LOW WATER MLW = 0.064
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (01/09/1978) = -0.968
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
PAVILION 1963 4.043 2.228
PAVILION NO 2 1963 4.190 2.375
PAVILION NO 1 1963 4.243 2.428
NO 5 1966 4.527 2.712
NO 6 1966 3.022 1.207
NO 7 1971 2.831 1.016
NO 9 1973 3.693 1.878
7630 H 1976 3.542 1.727
7630 L 1981 3.493 1.678
7630 M 1981 3.796 1.981
F 137 1979 2.914 1.099
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 10 of 10
Station ID: 8667630 PUBLICATION DATE: 05/06/2003
Name: EDISTO BEACH, EDISTO ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 30.1' N ( 32.50170)
USGS Quad: EDISTO ISLAND Longitude: 80° 17.8' W ( -80.29670)
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.