Bench Mark Sheet for 8662953, WINDSOR PLANTATION, BLACK RIVER 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8662953                         PUBLICATION DATE:  10/30/2003
Name:       WINDSOR PLANTATION, BLACK RIVER                   
            SC
NOAA Chart: 11534                           Latitude:   33° 24.9' N (  33.41500)
USGS Quad:  WAVERLY MILLS                   Longitude:  79° 15.0' W ( -79.25000)


To reach the tidal bench marks from the junction of U.S. Highways 701, 17 and 17
Alternate (Church Street) in Georgetown, proceed north on U.S. Highway 701
(North Fraser Street) for 4.8 km (3.0 mi) to State Road 325 (Wedgefield Road),
then turn right and go ENE on State Road 325 for 2.01 km (1.25 mi) to State Road
489 (Windsor Ave), then SE on State Road 489 for 1.53 km (0.95 mi) to State Road
512 (Roberts Road).  The bench marks are along State Road 512 east of State Road
489.  The tide gage and staff were on a dock at Dr. Tillers residence, about 91
m (300 ft) south of State Road 512.


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


                 PRIMARY BENCH MARK STAMPING:  WINDSOR NO 2 1934
                         DESIGNATION:          866 2953 WINDSOR TIDAL 2

MONUMENTATION:           Reference Mark disk                   VM#:         3968
AGENCY:                  U.S. Coastal and Geodetic Survey
                         (USC&GS)                              IDB PID#:  DD4410
SETTING CLASSIFICATION:  Concete monument                      OPUS PID:        
LATITUDE:   32° 24.9' N (  32.41500)          LONGITUDE:  79° 15.0' W ( -79.25000)


The primary bench mark is a disk set in a concrete monument near an L-shaped
dock, about 0.40 km (0.25 mi) east of State Road 489 (Windsor Avenue), 61 m (200
ft) SE of State Road 512 (Roberts Road), 32 m (105 ft) SW of a boat ramp, 15 m
(50 ft) NW of the end of the L shaped dock, 5 m (18 ft) NW of the approximate
high water line, and 0.06 m (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: 8662953                         PUBLICATION DATE:  10/30/2003
Name:       WINDSOR PLANTATION, BLACK RIVER                   
            SC
NOAA Chart: 11534                           Latitude:   33° 24.9' N (  33.41500)
USGS Quad:  WAVERLY MILLS                   Longitude:  79° 15.0' W ( -79.25000)


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


                         BENCH MARK STAMPING:  WINDSOR NO 3 1934
                         DESIGNATION:          WINDSOR RM 3

MONUMENTATION:           Reference Mark disk                   VM#:         3969
AGENCY:                  U.S. Coastal and Geodetic Survey
                         (USC&GS)                              IDB PID#:  DD2195
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   33° 25.0' N (  33.41670)          LONGITUDE:  79° 15.0' W ( -79.25000)


The bench mark is a disk set in a concrete monument along State Road 512
(Roberts Road), about 0.32 km (0.20 mi) east of the intersection with State Road
489 (Windsor Avenue),  12.59 m (41.3 ft) SW of the SE corner of a large barn, 12
m (40 ft) NNW of State Road 512, 3.32 m (10.9 ft) of a fence, 2.19 m (7.2 ft)
south of the south side of the barn, 0.30 m (1.0 ft) SW of a metal witness post
with sign, and 0.12 m (0.4 ft) above the ground.



                         BENCH MARK STAMPING:  2953 C 1977
                         DESIGNATION:          866 2953 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3970
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2192
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   33° 25.0' N (  33.41670)          LONGITUDE:  79° 15.1' W ( -79.25170)


The bench mark is a disk located in a vacant lot along State Road 512 (Roberts
Road), about 0.08 km (0.05 mi) east of the intersection with State Road 489,
37.49 m (123.0 ft) WSW of utility pole #3365, M 35.30 m (115.8 ft) SW of the SW
corner of a house, 14.51 m (47.6 ft) west of the centerline of a driveway, and
7.32 m (24.0 ft) north of the centerline of State Road 512.  The bench mark is
at ground level, crimped to the top of a copper-clad steel rod driven 9 m (28
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: 8662953                         PUBLICATION DATE:  10/30/2003
Name:       WINDSOR PLANTATION, BLACK RIVER                   
            SC
NOAA Chart: 11534                           Latitude:   33° 24.9' N (  33.41500)
USGS Quad:  WAVERLY MILLS                   Longitude:  79° 15.0' W ( -79.25000)


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


                         BENCH MARK STAMPING:  2953 D 1977
                         DESIGNATION:          866 2953 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3971
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2193
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   33° 25.0' N (  33.41670)          LONGITUDE:  79° 15.0' W ( -79.25000)


The bench mark is a disk located along State Road 512 (Roberts Road), about 0.24
km (0.15 mi) east of the intersection with State Road 489, 10.00 m (32.8 ft) NNW
of the centerline of State Road 512, 5.09 m (16.7 ft) ENE of the centerline of a
dirt road leading NW, 2.32 m (7.6 ft) NW of a wooden post with sign CAUTION
CHILDREN PLAYING, 1.58 m (5.2 ft) NW of utility pole #FL-65 2-6573, and 1.55 m
(5.1 ft) west of a wooden fence corner post with gate.  The bench mark is at
ground level, crimped to the top of a copper-clad steel rod driven 11.0 m (36
ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  2953 E 1977
                         DESIGNATION:          866 2953 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3972
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2196
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   33° 25.0' N (  33.41670)          LONGITUDE:  79° 14.9' W ( -79.24830)


The bench mark is a disk located along State Road 512 (Roberts Road), about 0.40
m (0.25 mi) east of the intersection with State Road 489 (Windsor Avenue), 19.99
m (65.6 ft) WNW of the west corner of the garage of a house, 18.35 m (60.2 ft)
ESE of a 1.28 m (4.2 ft) diameter live oak tree, 6.74 m (22.1 ft) SE of the
centerline of State Road 512, and 5.30 m (17.4 ft) WSW of the WSW edge of the
concrete drive leading to a house.  The bench mark is at ground level, crimped
to the top of a copper-clad steel rod driven 9.1 m (30 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: 8662953                         PUBLICATION DATE:  10/30/2003
Name:       WINDSOR PLANTATION, BLACK RIVER                   
            SC
NOAA Chart: 11534                           Latitude:   33° 24.9' N (  33.41500)
USGS Quad:  WAVERLY MILLS                   Longitude:  79° 15.0' W ( -79.25000)


                            T I D A L   D A T U M S 


Tidal datums at WINDSOR PLANTATION, BLACK RIVER based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           October 1975 - September 1976
     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 (08/20/1976)         =  1.448
     MEAN HIGHER HIGH WATER                     MHHW   =  1.159
     MEAN HIGH WATER                            MHW    =  1.092
     MEAN SEA LEVEL                             MSL    =  0.596
     North American Vertical Datum              NAVD88 =  0.596
     MEAN TIDE LEVEL                            MTL    =  0.568
     MEAN LOW WATER                             MLW    =  0.043
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/01/1976)         = -0.482

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     WINDSOR NO 2 1934                           1.673    0.581
     WINDSOR NO 3 1934                           3.021    1.929
     2953 C 1977                                 2.702    1.610
     2953 D 1977                                 3.275    2.183
     2953 E 1977                                 2.001    0.909


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

                                                                                
Station ID: 8662953                         PUBLICATION DATE:  10/30/2003
Name:       WINDSOR PLANTATION, BLACK RIVER                   
            SC
NOAA Chart: 11534                           Latitude:   33° 24.9' N (  33.41500)
USGS Quad:  WAVERLY MILLS                   Longitude:  79° 15.0' W ( -79.25000)


                             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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