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Bench Mark Sheet for 8667679, CARTERS DOCK, BIG BAY CREEK SC

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                                                
Station ID: 8667679                         PUBLICATION DATE:  02/05/2004
Name:       CARTER'S DOCK, BIG BAY CREEK                      
            SC
NOAA Chart: 11521                           Latitude:   32° 29.6' N (  32.49330)
USGS Quad:  EDISTO BEACH                    Longitude:  80° 19.6' W ( -80.32670)


To reach the tidal bench marks from Collins Pier in Edisto Beach, proceed 3.2 km
(2.0 mi) SW along the beach front road to Oristo Golf Course, then turn right
onto the golf course paved road (Dock Site Road) and proceed 0.6 km (0.4 mi) to
a dirt road on the right, then turn right onto the dirt road and proceed for 0.3
km (0.2 mi) to the first house, owned by Mr. Gerald Carter.  The tide gage and
staff were located on a dock behind the second house, at the confluence of Big
Bay Creek and Scott Creek.  The bench marks are located near the first house,
and along Dock Site Road.


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  C.D. NO 1 1975
                         DESIGNATION:          866 7679 TIDAL CD 1

MONUMENTATION:           Tidal Station disk                    VM#:         4379
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK1822
SETTING CLASSIFICATION:  Concrete patio and pillar foundation  OPUS PID:        
LATITUDE:   32° 29.4' N (  32.49000)          LONGITUDE:  80° 19.4' W ( -80.32330)


The primary bench mark is a disk set in the NW corner of a concrete slab
supporting a two story wood-sided house, 4.02 m (13.2 ft) NW of the NW corner of
the main part of the house, and 0.46 m (1.5 ft) SSE of the SE corner of the
concrete block support for the sun deck. 

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8667679                         PUBLICATION DATE:  02/05/2004
Name:       CARTER'S DOCK, BIG BAY CREEK                      
            SC
NOAA Chart: 11521                           Latitude:   32° 29.6' N (  32.49330)
USGS Quad:  EDISTO BEACH                    Longitude:  80° 19.6' W ( -80.32670)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  C.D. NO 2 1975
                         DESIGNATION:          866 7679 TIDAL CD 2

MONUMENTATION:           Tidal Station disk                    VM#:         4380
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK1821
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 29.4' N (  32.49000)          LONGITUDE:  80° 19.4' W ( -80.32330)


The bench mark is a disk located a disk, 34.17m (112.1 ft) NW of the center of
the sand road, 4.66 m (15.3 ft) WSW of the west edge of the west concrete garage
entrance, and 3.75 m (12.3 ft) south of the SW corner of a concrete slab
supporting a house.  The bench mark is set 3 cm (0.1 ft) below ground level,
crimped to the top of a copper-clad steel rod driven 12.2 m (40 ft) to refusal,
and encased in a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  C.D. NO 3 1975
                         DESIGNATION:          866 7679 TIDAL CD 3

MONUMENTATION:           Tidal Station disk                    VM#:         4381
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK1825
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 29.4' N (  32.49000)          LONGITUDE:  80° 19.5' W ( -80.32500)


The bench mark is a disk, 25.76 m (84.5 ft) NE of the centerline of the road,
11.77 m (38.6 ft) SE of the power pole #145841, and 3.66 m (12.0 ft) SW of the
west corner of a one story concrete block building, and 1 m (4 ft) NNW from a
witness post. The bench mark is set at ground level, crimped to the top of a
copper-clad steel rod driven 12.2 m (40 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: 8667679                         PUBLICATION DATE:  02/05/2004
Name:       CARTER'S DOCK, BIG BAY CREEK                      
            SC
NOAA Chart: 11521                           Latitude:   32° 29.6' N (  32.49330)
USGS Quad:  EDISTO BEACH                    Longitude:  80° 19.6' W ( -80.32670)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  C.D. NO 4 1975
                         DESIGNATION:          866 7679 TIDAL CD 4

MONUMENTATION:           Tidal Station disk                    VM#:         4382
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK1824
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID#: CK1824
LATITUDE:   32° 29.4' N (  32.49000)          LONGITUDE:  80° 19.6' W ( -80.32670)


The bench mark is a disk located west of Dock Site Road, 51.21 m (168.0 ft)
south of and across the road from bench mark C.D. No 3 1975, 8.69 m (28.5 ft) SW
of the centerline of Dock Site Road, 1.98 m (6.5 ft) WNW of utility pole #95971,
and 1 m (3 ft) SE of a witness post.  The bench mark is set 3 cm (0.1 ft) below
ground level, crimped to the top of a copper-clad steel rod driven 12.2 m (40
ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  C.D. NO 5 1975
                         DESIGNATION:          866 7679 TIDAL CD 5

MONUMENTATION:           Tidal Station disk                    VM#:         4383
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK1820
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 29.3' N (  32.48830)          LONGITUDE:  80° 19.5' W ( -80.32500)


The bench mark is a disk located west of Dock Site Road, 59 m (194 ft) SE of
bench mark C.D. No 4 1975, 19.23 m (63.1 ft) west of and across the road from a
wood slat fence, 7.99 m (26.2 ft) SW of the centerline of Dock Site Road, 1.77 m
(5.8 ft) NW of utility pole #111641, and 1 m (4 ft) SE of a witness post.  The
bench mark is set 6 cm (0.2 ft) above ground level, crimped to the top of a
copper-clad steel rod driven 12.2 m (40 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: 8667679                         PUBLICATION DATE:  02/05/2004
Name:       CARTER'S DOCK, BIG BAY CREEK                      
            SC
NOAA Chart: 11521                           Latitude:   32° 29.6' N (  32.49330)
USGS Quad:  EDISTO BEACH                    Longitude:  80° 19.6' W ( -80.32670)


                            T I D A L   D A T U M S 


Tidal datums at CARTER'S DOCK, BIG BAY CREEK based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           March 1976 - February 1977
     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 (11/02/1975)         =  2.465
     MEAN HIGHER HIGH WATER                     MHHW   =  1.991
     MEAN HIGH WATER                            MHW    =  1.881
     North American Vertical Datum              NAVD88 =  1.109
     MEAN SEA LEVEL                             MSL    =  1.028
     MEAN TIDE LEVEL                            MTL    =  0.970
     MEAN LOW WATER                             MLW    =  0.060
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (12/21/1976)         = -1.070

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     C.D. NO 1 1975                              2.645    0.764
     C.D. NO 2 1975                              2.551    0.670
     C.D. NO 3 1975                              2.887    1.006
     C.D. NO 4 1975                              2.563    0.682
     C.D. NO 5 1975                              2.786    0.905


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  5

                                                                                
Station ID: 8667679                         PUBLICATION DATE:  02/05/2004
Name:       CARTER'S DOCK, BIG BAY CREEK                      
            SC
NOAA Chart: 11521                           Latitude:   32° 29.6' N (  32.49330)
USGS Quad:  EDISTO BEACH                    Longitude:  80° 19.6' W ( -80.32670)


                             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.

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Products available at 8667679 CARTERS DOCK, BIG BAY CREEK, SC

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services