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National Ocean Service
Datums Page Page 1 of 5
Station ID: 8664688 PUBLICATION DATE: 03/09/2004
Name: CLOUTER CREEK, NORTH
SC
NOAA Chart: 11524 Latitude: 32° 54.4' N ( 32.90670)
USGS Quad: NORTH CHARLESTON Longitude: 79° 56.1' W ( -79.93500)
To reach the tidal bench marks from Port Terminal in North Charleston, proceed
by boat NE for about 2.6 km (1.6 statute mi) to the northern entrance of Clouter
Creek. The bench marks are in the marshy area at the lighted range marker
structure (Rear Range B). The tide gage and staff were on the four pile pier
structure at the east end of the walkway used to access the range marker.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 4688 A 1977
DESIGNATION: 866 4688 A
MONUMENTATION: Tidal Station disk VM#: 4085
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified steel rod OPUS PID:
LATITUDE: 32° 54.4' N ( 32.90670) LONGITUDE: 79° 56.1' W ( -79.93500)
The primary bench mark is a disk located along the access walkway to the range
marker structure, 78 m (256 ft) east of the center pile of the range marker, 33
m (108 ft) SW of the most northerly pile of the four pile pier structure, and 1
m (2 ft) west of a witness post. The bench mark is set 15 cm (0.5 ft) above the
ground, crimped to the top of a steel rod driven 19.2 m (63 ft).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8664688 PUBLICATION DATE: 03/09/2004
Name: CLOUTER CREEK, NORTH
SC
NOAA Chart: 11524 Latitude: 32° 54.4' N ( 32.90670)
USGS Quad: NORTH CHARLESTON Longitude: 79° 56.1' W ( -79.93500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4688 B 1977
DESIGNATION: 866 4688 B
MONUMENTATION: Tidal Station disk VM#: 4086
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified steel rod OPUS PID:
LATITUDE: 32° 54.4' N ( 32.90670) LONGITUDE: 79° 56.1' W ( -79.93500)
The bench mark is a disk located at the range marker structure, 73 m (240 ft) SW
of the most northerly pile of the four pile pier structure in Clouter Creek, 5 m
(16 ft) east of the center pile of the range marker, and 0.76 m (2.5 ft) east of
a witness post. The bench mark is set 15 cm (0.5 ft) above the ground, crimped
to the top of a steel rod driven 19.2 m (63 ft).
BENCH MARK STAMPING: 4688 C 1977
DESIGNATION: 866 4688 C
MONUMENTATION: Tidal Station disk VM#: 4087
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified steel rod OPUS PID:
LATITUDE: 32° 54.4' N ( 32.90670) LONGITUDE: 79° 56.1' W ( -79.93500)
The bench mark is a disk located in the vicinity of the range marker structure,
46 m (150 ft) south of the approximate shoreline of Cooper River, 22 m (72 ft)
NW of the center pile of the range marker, and 1 m (2 ft) SE of a witness post.
The bench mark is set 15 cm (0.5 ft) above the ground, crimped to the top of a
steel rod driven 19.2 m (63 ft).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8664688 PUBLICATION DATE: 03/09/2004
Name: CLOUTER CREEK, NORTH
SC
NOAA Chart: 11524 Latitude: 32° 54.4' N ( 32.90670)
USGS Quad: NORTH CHARLESTON Longitude: 79° 56.1' W ( -79.93500)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 4688 D 1977
DESIGNATION: 866 4688 D
MONUMENTATION: Tidal Station disk VM#: 4088
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified steel rod OPUS PID:
LATITUDE: 32° 54.4' N ( 32.90670) LONGITUDE: 79° 56.1' W ( -79.93500)
The bench mark is a disk located in the vicinity of the range marker structure,
46 m (150 ft) south of the approximate shoreline of Cooper River, 45 m (146 ft)
west of the center pile of the range marker, and 1 m (2 ft) SE of a witness
post. The bench mark is set 15 cm (0.5 ft) above the ground, crimped to the top
of a steel rod driven 19.2 m (63 ft).
BENCH MARK STAMPING: 4688 E 1977
DESIGNATION: 866 4688 E
MONUMENTATION: Tidal Station disk VM#: 4089
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Unspecified steel rod OPUS PID:
LATITUDE: 32° 54.4' N ( 32.90670) LONGITUDE: 79° 56.1' W ( -79.93500)
The bench mark is a disk located 73 m (241 ft) west of the center pile of the
range marker, 46 m (150 ft) south of the approximate shoreline of Cooper River,
and 1 m (2 ft) south of a witness post. The bench mark is set 15 cm (0.5 ft)
above the ground, crimped to the top of a steel rod driven 19.2 m (63 ft).
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8664688 PUBLICATION DATE: 03/09/2004
Name: CLOUTER CREEK, NORTH
SC
NOAA Chart: 11524 Latitude: 32° 54.4' N ( 32.90670)
USGS Quad: NORTH CHARLESTON Longitude: 79° 56.1' W ( -79.93500)
T I D A L D A T U M S
Tidal datums at CLOUTER CREEK, NORTH based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: December 1977 - April 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:
MEAN HIGHER HIGH WATER MHHW = 1.818
MEAN HIGH WATER MHW = 1.715
MEAN SEA LEVEL MSL = 0.979
MEAN TIDE LEVEL MTL = 0.887
MEAN LOW WATER MLW = 0.058
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
4688 A 1977 1.470 -0.245
4688 B 1977 1.465 -0.250
4688 C 1977 1.540 -0.175
4688 D 1977 1.738 0.023
4688 E 1977 1.473 -0.242
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8664688 PUBLICATION DATE: 03/09/2004
Name: CLOUTER CREEK, NORTH
SC
NOAA Chart: 11524 Latitude: 32° 54.4' N ( 32.90670)
USGS Quad: NORTH CHARLESTON Longitude: 79° 56.1' W ( -79.93500)
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.