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Datums Page Page 1 of 5
Station ID: 8663781 PUBLICATION DATE: 03/09/2004
Name: FRENCH QUARTER CREEK
SC
NOAA Chart: 11527 Latitude: 33° 3.3' N ( 33.05500)
USGS Quad: KITTREDGE Longitude: 79° 52.8' W ( -79.88000)
To reach the tidal bench marks from the intersection of State Highway 41 and
County Road S-8-98 (Cainhoy Road) in Huger, proceed SW on County Road S-8-98 for
7.4 km (4.6 mi) to the entrance gates of Blessing Plantation, then turn right
and proceed west on the dirt entrance road (Blessing Lane) for 2.6 km (1.6 mi),
crossing two wooden plank bridges to an abandoned loading dock at the end of the
road. The bench marks are located along the entrance road and at the two
bridges. The tide gage and staff were located at the offshore end of the
loading dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 3781 A 1976
DESIGNATION: 866 3781 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 4022
AGENCY: National Ocean Survey (NOS) IDB PID#: DD1196
SETTING CLASSIFICATION: Copper clad steel rod OPUS PID:
LATITUDE: 33° 3.3' N ( 33.05500) LONGITUDE: 79° 52.7' W ( -79.87830)
The primary bench mark is a disk located near the second bridge leading to the
creek, 16.76 m (55.0 ft) SSW of the SW corner of the bridge, 11.49 m (37.7 ft)
SE of a lone 1 m (4 ft) diameter pine tree, and 4 m (13 ft) WNW of the
approximate centerline of the road leading to the creek. The bench mark is set
level with the road, crimped to the top of a copper-clad steel rod driven 7.6 m
(25 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: 8663781 PUBLICATION DATE: 03/09/2004
Name: FRENCH QUARTER CREEK
SC
NOAA Chart: 11527 Latitude: 33° 3.3' N ( 33.05500)
USGS Quad: KITTREDGE Longitude: 79° 52.8' W ( -79.88000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3781 C 1976
DESIGNATION: 866 3781 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 4023
AGENCY: National Ocean Survey (NOS) IDB PID#: DD1195
SETTING CLASSIFICATION: Copper clad steel rod OPUS PID:
LATITUDE: 33° 3.3' N ( 33.05500) LONGITUDE: 79° 52.7' W ( -79.87830)
The bench mark is a disk located near the first bridge leading to the creek,
15.15 m (49.7 ft) NE of the NE corner of the bridge, 4 m (13 ft) NNW of the
approximate centerline of the road leading to the creek, 1.95 m (6.4 ft) SW of a
1 m (4 ft) diameter pine tree (last tree on right before bridge), and 0.79 m
(2.6 ft) SSE of a witness post. The bench mark is set level with the ground,
crimped to the top of a copper-clad steel rod driven 7.9 m (26 ft) to refusal,
and encased in a 4-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: 3781 D 1976
DESIGNATION: 866 3781 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 4024
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper pipe surrounded by concrete OPUS PID:
LATITUDE: 33° 3.3' N ( 33.05500) LONGITUDE: 79° 52.8' W ( -79.88000)
The bench mark is a disk located on the south side of the road between the manor
house and the first wooden bridge, 101 m (330 ft) NE of bench mark 3781 C 1976,
6.64 m (21.8 ft) SE of the entrance road, 3.90 m (12.8 ft) SSE of a 0.46 m (1.5
ft) diameter pine tree, and 3.20 m (10.5 ft) NNE of a 1 m (2 ft) diameter pine
tree. The bench mark is brazed to the top of a 1.2 m (4 ft) long copper pipe
surrounded by concrete.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8663781 PUBLICATION DATE: 03/09/2004
Name: FRENCH QUARTER CREEK
SC
NOAA Chart: 11527 Latitude: 33° 3.3' N ( 33.05500)
USGS Quad: KITTREDGE Longitude: 79° 52.8' W ( -79.88000)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 3781 E 1976
DESIGNATION: 866 3781 E TIDAL
MONUMENTATION: Tidal Station disk VM#: 4025
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper clad steel rod OPUS PID:
LATITUDE: 33° 3.3' N ( 33.05500) LONGITUDE: 79° 52.8' W ( -79.88000)
The bench mark is a disk located on the north side of the entrance road, just
past the manor house, 94 m (309 ft) NNE of bench mark 3781 D 1976, 20 m (67 ft)
SSE of the tree line, 7.62 m (25.0 ft) SW of a 0.46 m (1.5 ft) diameter pine
tree, and 4.39 m (14.4 ft) NNW of the centerline of the road. The bench mark is
set level with the ground, crimped to the top of a copper-clad steel rod driven
8.8 m (29 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 4 of 5
Station ID: 8663781 PUBLICATION DATE: 03/09/2004
Name: FRENCH QUARTER CREEK
SC
NOAA Chart: 11527 Latitude: 33° 3.3' N ( 33.05500)
USGS Quad: KITTREDGE Longitude: 79° 52.8' W ( -79.88000)
T I D A L D A T U M S
Tidal datums at FRENCH QUARTER CREEK based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: August 1976 - October 1976
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8663665 RICHMOND PLANTATION, E. BR. COOPER RIVER
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 0.987
MEAN HIGH WATER MHW = 0.924
MEAN SEA LEVEL MSL = 0.544
MEAN TIDE LEVEL MTL = 0.499
North American Vertical Datum NAVD88 = 0.209
MEAN LOW WATER MLW = 0.075
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
3781 A 1976 1.355 0.431
3781 C 1976 2.001 1.077
3781 D 1976 2.955 2.031
3781 E 1976 4.358 3.434
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8663781 PUBLICATION DATE: 03/09/2004
Name: FRENCH QUARTER CREEK
SC
NOAA Chart: 11527 Latitude: 33° 3.3' N ( 33.05500)
USGS Quad: KITTREDGE Longitude: 79° 52.8' W ( -79.88000)
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.
Station Location
Published bench mark
Unpublished bench mark
