U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8664878 PUBLICATION DATE: 07/26/2004
Name: OLD CAPERS LANDING, CAPERS ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 52.2' N ( 32.87000)
USGS Quad: CAPERS INLET Longitude: 79° 41.2' W ( -79.68670)
To reach the tidal bench marks from Capers Inlet, proceed by boat north along
Capers Creek for 3 km (2 nm) to Santee Pass, then proceed NE and east along
Santee Pass for 2 km (1 nm) to the 90 degree bend in the river. The bench marks
are on Capers Island, adjacent to a road/path leading from the landing to the
ocean. The tide gage and staff were located on the end of a small dock.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: OCL NO 1 1975
DESIGNATION: 866 4878 TIDAL 1 OCL
MONUMENTATION: Tidal Station disk VM#: 4109
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 32° 52.2' N ( 32.87000) LONGITUDE: 79° 41.2' W ( -79.68670)
The primary bench mark is a disk located at the foot of the dock, 6.86 m (22.5
ft) east of the east corner of the dock, 5.64 m (18.5 ft) east of a 4x4-inch
post with sign "Closed Area", and 0.58 m (1.9 ft) south of a witness post with
sign. The bench mark is set 9 cm (0.3 ft) above grade, crimped to the top of a
copper-clad steel rod driven an unspecified depth 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 2 of 5
Station ID: 8664878 PUBLICATION DATE: 07/26/2004
Name: OLD CAPERS LANDING, CAPERS ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 52.2' N ( 32.87000)
USGS Quad: CAPERS INLET Longitude: 79° 41.2' W ( -79.68670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: OCL NO 2 1975
DESIGNATION: 866 4878 TIDAL 2 OCL
MONUMENTATION: Tidal Station disk VM#: 4110
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 32° 52.2' N ( 32.87000) LONGITUDE: 79° 41.2' W ( -79.68670)
The bench mark is a disk located along an old palmetto log road in the marsh,
51.54 m (169.1 ft) SSE of bench mark OCL NO 1 1975, 1 m (4 ft) ENE of the
centerline of the road, and 0.49 m (1.6 ft) WSW of a witness post with sign.
The bench mark is 12 cm (0.4 ft) above grade, crimped to the top of a
copper-clad steel rod driven an unspecified depth to refusal, and encased in a
5-inch PVC pipe and concrete kickblock.
BENCH MARK STAMPING: OCL NO 3 1975
DESIGNATION: 866 4878 TIDAL 3 OCL
MONUMENTATION: Tidal Station disk VM#: 4111
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper-clad steel rod OPUS PID:
LATITUDE: 32° 52.2' N ( 32.87000) LONGITUDE: 79° 41.2' W ( -79.68670)
The bench mark is a disk located near the edge of the woods, 95.92 m (314.7 ft)
SSE of bench mark OCL NO 2 1975, 22.62 m (74.2 ft) south of power pole #141416,
2.96 m (9.7 ft) NE of a 0.61 m (2.0 ft) diameter palmetto tree, and 0.46 m (1.5
ft) NNE of a witness post with sign. The bench mark is set 6 cm (0.2 ft) above
grade, crimped to the top of a copper-clad steel rod driven an unspecified depth
to refusal, and encased in a 5-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: 8664878 PUBLICATION DATE: 07/26/2004
Name: OLD CAPERS LANDING, CAPERS ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 52.2' N ( 32.87000)
USGS Quad: CAPERS INLET Longitude: 79° 41.2' W ( -79.68670)
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: OCL NO 4 1975
DESIGNATION: 866 4878 TIDAL 4 OCL
MONUMENTATION: Tidal Station disk VM#: 4112
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper pipe imbedded in concrete OPUS PID:
LATITUDE: 32° 52.2' N ( 32.87000) LONGITUDE: 79° 41.2' W ( -79.68670)
The bench mark is a disk brazed to a 1 m (4 ft) long, 2-inch copper pipe
imbedded in concrete located in a palmetto grove along the path to the ocean,
15.70 m (51.5 ft) south of bench mark OCL NO 3 1975, 1.52 m (5.0 ft) NE of the
foot path to the front beach, 1.16 m (3.8 ft) SW of a 0.61 m (2.0 ft) diameter
palmetto tree, 1.07 m (3.5 ft) NW of a 0.61 m (2.0 ft) diameter palmetto tree,
0.67 m (2.2 ft) west of a witness post with sign, and 0.06 m (0.2 ft) above
grade.
BENCH MARK STAMPING: OCL NO 5 1975
DESIGNATION: 866 4878 TIDAL 5 OCL
MONUMENTATION: Tidal Station disk VM#: 4113
AGENCY: National Ocean Survey (NOS) IDB PID#:
SETTING CLASSIFICATION: Copper pipe imbedded in concrete OPUS PID:
LATITUDE: 32° 52.2' N ( 32.87000) LONGITUDE: 79° 41.2' W ( -79.68670)
The bench mark is a disk brazed to a 1 m (4 ft) long, 2-inch copper pipe
imbedded in concrete located along the path to the ocean, 25.30 m (83.0 ft) SE
of bench mark OCL NO 4 1975, 4.15 m (13.6 ft) NNE of a 0.76 m (2.5 ft) diameter
oak tree, 0.55 m (1.8 ft) SW of a tin tool shed/garage building, 0.40 m (1.3 ft)
NW of a witness post with sign, and 0.12 m (0.4 ft) above grade.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8664878 PUBLICATION DATE: 07/26/2004
Name: OLD CAPERS LANDING, CAPERS ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 52.2' N ( 32.87000)
USGS Quad: CAPERS INLET Longitude: 79° 41.2' W ( -79.68670)
T I D A L D A T U M S
Tidal datums at OLD CAPERS LANDING, CAPERS ISLAND based on:
LENGTH OF SERIES: 1 MONTH
TIME PERIOD: October 1975 - October 1975
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8664941 SOUTH CAPERS ISLAND, CAPERS CREEK
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER MHHW = 1.670
MEAN HIGH WATER MHW = 1.548
MEAN SEA LEVEL MSL = 0.815
MEAN TIDE LEVEL MTL = 0.797
MEAN LOW WATER MLW = 0.047
MEAN LOWER LOW WATER MLLW = 0.000
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
OCL NO 1 1975 1.987 0.439
OCL NO 2 1975 1.709 0.161
OCL NO 3 1975 1.876 0.328
OCL NO 4 1975 2.496 0.948
OCL NO 5 1975 2.359 0.811
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8664878 PUBLICATION DATE: 07/26/2004
Name: OLD CAPERS LANDING, CAPERS ISLAND
SC
NOAA Chart: 11521 Latitude: 32° 52.2' N ( 32.87000)
USGS Quad: CAPERS INLET Longitude: 79° 41.2' W ( -79.68670)
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.