U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8667209 PUBLICATION DATE: 02/05/2004
Name: MUSSELBORO ISLAND, MOSQUITO CREEK
SC
NOAA Chart: 11517 Latitude: 32° 34.7' N ( 32.57830)
USGS Quad: BENNETTS POINT Longitude: 80° 26.9' W ( -80.44830)
To reach the tidal bench marks from Jacksonboro, travel south on U.S. Highway 17
for 8 miles (13 km) to the intersection with State Road S-15-26, then turn left
and proceed SE on State Road S-15-26 for 25.1 km (15.6 mi) to the end of the
pavement where the road turns into a dirt road, then bear left and go 0.3 km
(0.2 mi) to a fork in the road, then take the left fork and immediately cross a
narrow wooden bridge, and proceed along the dirt road for 1.4 km (0.9 mi) to
where the road makes a sharp right turn, then turn left onto a dirt road at the
edge of a field and proceed 1.6 km (1.0 mi), then turn right onto a very dim
track road leading east to the creek bank. The bench marks are in the vicinity
of the dim track road. The tide gage and staff were located on a small pier on
Mosquito Creek.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 7209 A 1977
DESIGNATION: 866 7209 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 6741
AGENCY: National Ocean Survey (NOS) IDB PID#: CK3040
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 32° 34.7' N ( 32.57830) LONGITUDE: 80° 26.9' W ( -80.44830)
The primary bench mark is a disk located at the end of the dim track road near
the east bank of Mosquito Creek, 36.73 m (120.5 ft) NW of bench mark 7209 F
1981, 20.73 m (68.0 ft) NE of the centerline of the dirt road, 10.21 m (33.5 ft)
west of the center of the wooden dock walkway, 4.94 m (16.2 ft) NNW of the
centerline of the dim track road, and 0.64 m (2.1 ft) SW of a witness post. The
bench mark is at ground level, crimped to the top of a galvanized steel rod
driven 6.7 m (22 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 2 of 5
Station ID: 8667209 PUBLICATION DATE: 02/05/2004
Name: MUSSELBORO ISLAND, MOSQUITO CREEK
SC
NOAA Chart: 11517 Latitude: 32° 34.7' N ( 32.57830)
USGS Quad: BENNETTS POINT Longitude: 80° 26.9' W ( -80.44830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7209 C 1977
DESIGNATION: 866 7209 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 6742
AGENCY: National Ocean Survey (NOS) IDB PID#: CK3038
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 32° 34.7' N ( 32.57830) LONGITUDE: 80° 26.9' W ( -80.44830)
The bench mark is a disk located east of the dirt road and south of the dim
track road, 40.17 m (131.8 ft) SSE of bench mark 7209 G 1981, 31.52 m (103.4 ft)
west of bench mark 7209 F 1981, 2.80 m (9.2 ft) east of the centerline of the
dirt road, 1.40 m (4.6 ft) north of a 0.24 m (0.8 ft) diameter pine tree, and
0.64 m (2.1 ft) WSW of a witness post. The bench mark is at ground level,
crimped to the top of a galvanized steel rod driven 12.2 m (40 ft) to refusal,
and encased in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7209 E 1977
DESIGNATION: 866 7209 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 6743
AGENCY: National Ocean Survey (NOS) IDB PID#: CK3041
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 32° 34.7' N ( 32.57830) LONGITUDE: 80° 26.9' W ( -80.44830)
The bench mark is a disk located west of the dirt road, 35.63 m (116.9 ft) NNW
of bench mark 7209 G 1981, 3.26 m (10.7 ft) west of the centerline of the dirt
road, 1.52 m (5.0 ft) south of the center of a twin-trunked pine tree, and 0.73
m (2.4 ft) east of a witness post. The bench mark is set at ground level,
crimped to the top of a galvanized steel rod driven 8.5 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: 8667209 PUBLICATION DATE: 02/05/2004
Name: MUSSELBORO ISLAND, MOSQUITO CREEK
SC
NOAA Chart: 11517 Latitude: 32° 34.7' N ( 32.57830)
USGS Quad: BENNETTS POINT Longitude: 80° 26.9' W ( -80.44830)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 7209 F 1981
DESIGNATION: 866 7209 F TIDAL
MONUMENTATION: Tidal Station disk VM#: 6744
AGENCY: National Ocean Survey (NOS) IDB PID#: CK3039
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 32° 34.7' N ( 32.57830) LONGITUDE: 80° 26.9' W ( -80.44830)
The bench mark is a disk located along Mosquito Creek, 36.73 m (120.5 ft) SE of
bench mark 7209 A 1977, 31.52 m (103.4 ft) east of bench mark 7209 C 1977, 1.92
m (6.3 ft) NNE of a 0.24 m (0.8 ft) diameter pine tree, and 1.07 m (3.5 ft) ESE
of a witness post. The bench mark is set 0.06 m (0.2 ft) below ground level,
crimped to the top of a galvanized steel rod driven 14.6 m (48 ft), and encased
in a PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 7209 G 1981
DESIGNATION: 866 7209 G TIDAL
MONUMENTATION: Tidal Station disk VM#: 6745
AGENCY: National Ocean Survey (NOS) IDB PID#: CK3037
SETTING CLASSIFICATION: Galvanized steel rod OPUS PID:
LATITUDE: 32° 34.7' N ( 32.57830) LONGITUDE: 80° 26.9' W ( -80.44830)
The bench mark is a disk located near the road leading to Bennetts Point, 40.17
m (131.8 ft) NNW of bench mark 7209 C 1977, 35.63 m (116.9 ft) SSE of bench mark
7209 E 1977, 26.27 m (86.2 ft) WNW of bench mark 7209 A 1977, 3.14 m (10.3 ft)
WNW of the centerline of the dirt road, and 1.46 m (4.8 ft) east of a metal
witness post. The bench mark is set 0.12 m (0.4 ft) below ground level, crimped
to the top of a galvanized steel rod driven 12.2 m (40 ft) 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 4 of 5
Station ID: 8667209 PUBLICATION DATE: 02/05/2004
Name: MUSSELBORO ISLAND, MOSQUITO CREEK
SC
NOAA Chart: 11517 Latitude: 32° 34.7' N ( 32.57830)
USGS Quad: BENNETTS POINT Longitude: 80° 26.9' W ( -80.44830)
T I D A L D A T U M S
Tidal datums at MUSSELBORO ISLAND, MOSQUITO CREEK based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: March 1978 - February 1979
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8667630 EDISTO BEACH, EDISTO ISLAND
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
HIGHEST OBSERVED WATER LEVEL (07/19/1978) = 2.396
MEAN HIGHER HIGH WATER MHHW = 2.051
MEAN HIGH WATER MHW = 1.958
MEAN SEA LEVEL MSL = 1.144
North American Vertical Datum NAVD88 = 1.132
MEAN TIDE LEVEL MTL = 1.009
MEAN LOW WATER MLW = 0.061
MEAN LOWER LOW WATER MLLW = 0.000
LOWEST OBSERVED WATER LEVEL (02/22/1978) = -0.481
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
7209 A 1977 2.948 0.990
7209 C 1977 2.917 0.959
7209 E 1977 2.639 0.681
7209 F 1981 2.660 0.702
7209 G 1981 2.837 0.879
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8667209 PUBLICATION DATE: 02/05/2004
Name: MUSSELBORO ISLAND, MOSQUITO CREEK
SC
NOAA Chart: 11517 Latitude: 32° 34.7' N ( 32.57830)
USGS Quad: BENNETTS POINT Longitude: 80° 26.9' W ( -80.44830)
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.