Bench Mark Sheet for 8664611, BIG PARADISE ISLAND, WANDO 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8664611                         PUBLICATION DATE:  10/30/2003
Name:       BIG PARADISE ISLAND, WANDO RIVER                  
            SC
NOAA Chart: 11526                           Latitude:   32° 54.9' N (  32.91500)
USGS Quad:  SEWEE BAY                       Longitude:  79° 44.8' W ( -79.74670)


To reach the tidal bench marks from the intersection of U.S. Highway 17 and
Highway 17 (Business) in Mount Pleasant, proceed north on U.S. Highway 17 for
19.6 km (12.2 mi) to State Road S-10-98, turn left and proceed west on State
Road S-10-98 for 2.6 km (1.6 mi) to an asphalt road, then turn left and travel
on the asphalt road for 1.0 km (0.6 mi) to the end of the pavement, then
continue on the dirt road for 0.8 km (0.5 mi) to a set of utility poles and mail
boxes marking the way to the Norman Moore residence, then turn right and proceed
3.2 km (2.0 mi) to the Moore residence.  The bench marks are along the dirt road
and near a pier behind the house.  The tide gage and staff were on the pier.


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


                 PRIMARY BENCH MARK STAMPING:  4611 A 1977
                         DESIGNATION:          866 4611 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4075
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CJ0246
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 54.9' N (  32.91500)          LONGITUDE:  79° 44.8' W ( -79.74670)


The primary bench mark is a disk located between the Moore residence and the
pier, 82.81 (271.7 ft) south of the rad center, 19.99 m (65.6 ft) SE of the SW
corner of the Moore residence, 16.89 m (55.4 ft) SW of the SE corner of the
house, 8.69 m (28.5 ft) east of the center of a walkway leading to a dock, 1.71
m (5.6 ft) SW of a utility light pole.  The bench mark is 30 cm (1 ft) below
ground level, crimped to  the top of a copper-clad steel rod driven 9.8 m (32
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: 8664611                         PUBLICATION DATE:  10/30/2003
Name:       BIG PARADISE ISLAND, WANDO RIVER                  
            SC
NOAA Chart: 11526                           Latitude:   32° 54.9' N (  32.91500)
USGS Quad:  SEWEE BAY                       Longitude:  79° 44.8' W ( -79.74670)


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


                         BENCH MARK STAMPING:  4611 C 1977
                         DESIGNATION:          866 4611 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4076
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CJ0244
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 54.9' N (  32.91500)          LONGITUDE:  79° 44.8' W ( -79.74670)


The bench mark is a disk located at the intersection of the dirt road and the
driveway to the Moore residence, 10.91 m (35.8 ft) south of the road center,
10.21 m (33.5 ft) east of the center of a driveway leading south to the Moore
residence, 3.99 m (13.1 ft) west of the center of the driveway, 1.71 m (5.6 ft)
SW of a utility pole with a transformer, 1.49 m (4.9 ft) south of an underground
cable junction box #2P1. The bench mark is at 30 cm (1.0 ft) below the road,
crimped to the top of a copper-clad steel rod driven 6.1 m (20 ft) to refusal,
and encased in a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  4611 E 1977
                         DESIGNATION:          866 4611 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4077
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CJ0242
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   32° 54.9' N (  32.91500)          LONGITUDE:  79° 44.8' W ( -79.74670)


The bench mark is a disk located along the dirt road, 13.29 m (43.6 ft) west of
the center of a driveway leading south to a house at 1370 Eden Road, 7.80 m
(25.6 ft) south of the centerline of the road, 1.49 m (4.9 ft) SW fo a utility
pole with a guy cable and transformer. The bench mark is 30 cm (1.0 ft) below
the road, crimped to the top of a copper-clad steel rod driven 6.1 m (20 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: 8664611                         PUBLICATION DATE:  10/30/2003
Name:       BIG PARADISE ISLAND, WANDO RIVER                  
            SC
NOAA Chart: 11526                           Latitude:   32° 54.9' N (  32.91500)
USGS Quad:  SEWEE BAY                       Longitude:  79° 44.8' W ( -79.74670)


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


                         BENCH MARK STAMPING:  4611 F 1982
                         DESIGNATION:          866 4611 F TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4078
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CJ1472
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   32° 54.9' N (  32.91500)          LONGITUDE:  79° 44.8' W ( -79.74670)


The bench mark is a disk located along the dirt road, 81.23 m (266.5 ft) east of
bench mark 4611 C 1977, 8.69 m (28.5 ft) south of the centerline of the dirt
road, 6.89 m (22.6 ft) NNE of a 0.55 m (1.8 ft) diameter pine tree, 2.77 m (9.1
ft) SE of an unnumbered utility pole, and 0.37 m (1.2 ft) north of a witness
post with sign.  The bench mark is at ground level, crimped to the top of a
stainless steel rod driven 6.7 m (22 ft) 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  4 of  5

                                                                                
Station ID: 8664611                         PUBLICATION DATE:  10/30/2003
Name:       BIG PARADISE ISLAND, WANDO RIVER                  
            SC
NOAA Chart: 11526                           Latitude:   32° 54.9' N (  32.91500)
USGS Quad:  SEWEE BAY                       Longitude:  79° 44.8' W ( -79.74670)


                            T I D A L   D A T U M S 


Tidal datums at BIG PARADISE ISLAND, WANDO RIVER based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           June 1977 - May 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:

     HIGHEST OBSERVED WATER LEVEL (06/01/1977)         =  2.604
     MEAN HIGHER HIGH WATER                     MHHW   =  2.145
     MEAN HIGH WATER                            MHW    =  2.039
     MEAN SEA LEVEL                             MSL    =  1.227
     North American Vertical Datum              NAVD88 =  1.211
     MEAN TIDE LEVEL                            MTL    =  1.052
     MEAN LOW WATER                             MLW    =  0.064
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/09/1978)         = -0.935

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     4611 A 1977                                 3.372    1.333
     4611 C 1977                                 3.326    1.287
     4611 E 1977                                 2.958    0.919
     4611 F 1982                                 3.475    1.436


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

                                                                                
Station ID: 8664611                         PUBLICATION DATE:  10/30/2003
Name:       BIG PARADISE ISLAND, WANDO RIVER                  
            SC
NOAA Chart: 11526                           Latitude:   32° 54.9' N (  32.91500)
USGS Quad:  SEWEE BAY                       Longitude:  79° 44.8' W ( -79.74670)


                             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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