U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8666433 PUBLICATION DATE: 02/05/2004
Name: TOOGOODOO CREEK
SOUTH CAROLINA
NOAA Chart: 11522 Latitude: 32° 40.1' N
USGS Quad: ADAMS RUN Longitude: 80° 17.6' W
To reach the tidal bench marks from the intersection of U.S. Highway 17 and
State Highway 162, proceed SSW on State Highway 162 for 17.9 km (11.1 mi) to
State Highway 164, then veer left and proceed SW of State Highway 164 for about
3.9 km (2.4 mi) to State Highway 174, then turn left and proceed south on State
Highway 174 for 3.2 km (2.0 mi) to State Highway S-10-89, then turn left and
proceed east on State Highway S-10-89 for 4.5 km (2.8 mi) until the pavement
ends, then continue on the dirt road through two gates for 1.8 km (1.1 mi) to
the pier on Toogoodoo Creek at Little Britton Island. The bench marks are along
the creek and in the vicinity of a wooden house. The tide gauge was on a
platform adjacent to the pier and the tide staff was affixed to the pier.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6433 B 1977
DESIGNATION: 866 6433 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 4308
AGENCY: National Ocean Survey (NOS) PID#: CK1752
SETTING CLASSIFICATION: Galvanized steel rod
The primary bench mark is a disk located near a concrete block building, 15.97 m
(52.4 ft) WSW of the NE corner of the building, 6.46 m (21.2 ft) NNW of the SW
corner of the building, and 1.83 m (6.0 ft) west of the NW corner of the
building. The bench mark is set at ground level, crimped to the top of a
galvanized steel rod driven 9.1m (30 ft) to refusal, and encased in a PVC pipe
and concrete kickblock.
BENCH MARK STAMPING: NO 1 1934
DESIGNATION: 866 6433 TIDAL 1
MONUMENTATION: Tidal Station disk VM#: 4307
AGENCY: US Coast and Geodetic Survey (USC&GS) PID#: CK1753
SETTING CLASSIFICATION: Concrete-filled tile pipe
The bench mark is a disk set in a concrete-filled tile pipe between the front
steps of the wooden summer house and the pier, 14.84 m (48.7 ft) NNE of the SE
corner of the wooden house, 10 m (34 ft) NE of the NE corner of the same wooden
house, 4.24 m (13.9 ft) SW of the southernmost piling at the landward end of the
pier, and about 6 cm (0.2 ft) above the ground.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8666433 PUBLICATION DATE: 02/05/2004
Name: TOOGOODOO CREEK
SOUTH CAROLINA
NOAA Chart: 11522 Latitude: 32° 40.1' N
USGS Quad: ADAMS RUN Longitude: 80° 17.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6433 C 1977
DESIGNATION: 866 6433 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 4309
AGENCY: National Ocean Survey (NOS) PID#: CK1751
SETTING CLASSIFICATION: Concrete monument
The bench mark is a disk set in the top of a concrete monument in a cultivated
field west of the concrete block building, 29.78 m (97.7 ft) NW of the SW corner
of the concrete block building, 24.75 m (81.2 ft) WNW of Bench Mark 6433 B 1977,
and 1 m (4 ft) WSW of SCE&G power pole #117165.
BENCH MARK STAMPING: 6433 D 1977
DESIGNATION: 866 6433 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 4310
AGENCY: National Ocean Survey (NOS) PID#: CK1755
SETTING CLASSIFICATION: Galvanized steel rod
The bench mark is a disk located among the trees along the bank of Toogoodoo
Creek, about 73 m (240 ft) SSE of the NE corner of the wooden house, 55.29 m
(181.4 ft) SE of the SE corner of the wooden house, and 9.24 m (30.3 ft) NW of a
twin live oak tree. The bench mark is set level with the ground, crimped to the
top of a galvanized steel rod driven 9.1 m (30 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 3 of 5
Station ID: 8666433 PUBLICATION DATE: 02/05/2004
Name: TOOGOODOO CREEK
SOUTH CAROLINA
NOAA Chart: 11522 Latitude: 32° 40.1' N
USGS Quad: ADAMS RUN Longitude: 80° 17.6' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6433 E 1977
DESIGNATION: 866 6433 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 4311
AGENCY: National Ocean Survey (NOS) PID#: CK1756
SETTING CLASSIFICATION: Galvanized steel rod
The bench mark is a disk located south of the gauge site near the southwestern
most oak trees north of a drainage ditch flowing into Toogoodoo Creek, 103.27 m
(338.9 ft) SSE of the SE corner of the wooden house, 48.01 m (157.5 ft) south of
Bench Mark 6433 D 1977, 5.15 m (16.9 ft) south of the SW corner of the first
grove of oak trees north of the drainage ditch and 0.55 m (1.8 ft) SW of a
witness post and sign. The bench mark is set 3 cm (0.1 ft) above the ground,
crimped to the top of a galvanized steel rod driven 9.1 m (30 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: 8666433 PUBLICATION DATE: 02/05/2004
Name: TOOGOODOO CREEK
SOUTH CAROLINA
NOAA Chart: 11522 Latitude: 32° 40.1' N
USGS Quad: ADAMS RUN Longitude: 80° 17.6' W
T I D A L D A T U M S
Tidal datums at TOOGOODOO CREEK based on:
LENGTH OF SERIES: 1 YEAR
TIME PERIOD: November 1977 - October 1978
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 (03/09/1978) = 2.510
MEAN HIGHER HIGH WATER (MHHW) = 2.117
MEAN HIGH WATER (MHW) = 1.998
NORTH AMERICAN VERTICAL DATUM-1988 (NAVD) = 1.198
MEAN SEA LEVEL (MSL) = 1.165
MEAN TIDE LEVEL (MTL) = 1.029
MEAN LOW WATER (MLW) = 0.060
MEAN LOWER LOW WATER (MLLW) = 0.000
LOWEST OBSERVED WATER LEVEL (01/09/1978) = -0.940
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
6433 B 1977 2.690 0.692
NO 1 1934 2.855 0.857
6433 C 1977 2.608 0.610
6433 D 1977 2.551 0.553
6433 E 1977 2.591 0.593
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8666433 PUBLICATION DATE: 02/05/2004
Name: TOOGOODOO CREEK
SOUTH CAROLINA
NOAA Chart: 11522 Latitude: 32° 40.1' N
USGS Quad: ADAMS RUN Longitude: 80° 17.6' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.