Bench Mark Sheet for 8662071, PAWLEYS INLET, WARDS DOCK 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  4

                                                                                
Station ID: 8662071                         PUBLICATION DATE:  06/28/2004
Name:       PAWLEYS INLET, WARDS DOCK                         
            SC
NOAA Chart: 11534                           Latitude:   33° 24.7' N (  33.41170)
USGS Quad:  WAVERLY MILLS                   Longitude:  79°  8.1' W ( -79.13500)


To reach the tidal bench marks from the intersection of U.S. Highway 17 and
State Road 46 in Pawleys Island, proceed SE on State Road 46 for 1.0 km (0.6 mi)
to State Road 10, then SW on State Road 10 for 2.7 km (1.7 mi) to State Road
481, then SW on State Road 481 for 0.2 km (0.1 mi) to State Road 265.  The bench
marks are along State Roads 10, 481, and 265.  The tide gage and staff were SSW
of the junction of State Roads 481 and 265 at the end of Mr. R. Wards dock.


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


                 PRIMARY BENCH MARK STAMPING:  WD NO 1 1975
                         DESIGNATION:          866 2071 TIDAL WD 1

MONUMENTATION:           Tidal Station disk                    VM#:         3915
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD1422
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID#: DD1422
LATITUDE:   33° 24.7' N (  33.41170)          LONGITUDE:  79°  8.0' W ( -79.13330)


The primary bench mark is a disk located on the SW side of State Road 265, south
of the junction of State Roads 481 and 265, 19.29 m (63.3 ft) SSE of the SE
pylon of a two-story frame house (Dudley residence), 12.59 m (41.3 ft) SW of the
west corner of a cinder block support of a frame house (Ward residence), 8.26 m
(27.1 ft) SSW of utility pole #ABB30/28272, 7.44 m (24.4 ft) ESE of the extended
centerline of State Road 481, 4.02 m (13.2 ft) SSW of the centerline of State
Road 265, and 1.25 m (4.1 ft) east of power line stub pole #28273.  The bench
mark is set flush with the ground, crimped to the top of a copper-clad steel rod
driven an unspeci- fied depth to refusal, and encased in an ABS pipe with
concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                                                
Station ID: 8662071                         PUBLICATION DATE:  06/28/2004
Name:       PAWLEYS INLET, WARDS DOCK                         
            SC
NOAA Chart: 11534                           Latitude:   33° 24.7' N (  33.41170)
USGS Quad:  WAVERLY MILLS                   Longitude:  79°  8.1' W ( -79.13500)


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


                         BENCH MARK STAMPING:  WD NO 3 1975
                         DESIGNATION:          866 2071 TIDAL WD 3

MONUMENTATION:           Tidal Station disk                    VM#:         3917
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD1420
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   33° 24.7' N (  33.41170)          LONGITUDE:  79°  8.0' W ( -79.13330)


The bench mark is a disk set in the "V" west of the junction of State Roads 10
and 481, 22 m (72 ft) north of the north corner of a ship-shaped house on cinder
block stilts, 15 m (49 ft) NNE of utility pole #28243 with transformer, 5.91 m
(19.4 ft) NW of the centerline of State Road 481, and 5.00 m (16.4 ft) SSE of
the centerline of State Road 10.  The bench mark is set flush with the ground,
crimped to the top of a copper-clad steel rod driven an unspecified depth to
refusal, and encased in an ABS pipe with concrete kickblock.



                         BENCH MARK STAMPING:  WD NO 4 1975
                         DESIGNATION:          866 2071 TIDAL WD 4

MONUMENTATION:           Tidal Station disk                    VM#:         3918
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD1419
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID#: DD1419
LATITUDE:   33° 24.7' N (  33.41170)          LONGITUDE:  79°  7.9' W ( -79.13170)


The bench mark is a disk set in the "V" west of the junction of State Roads 10
and 481, 25.79 m (84.6 ft) NNW of the west pylon of a house with tile siding
(rental #85), 6.95 m (22.8 ft) SE of the centerline of State Road 10, 6.46 m
(21.2 ft) WNW of the centerline of State Road 481, and 5.49 m (18.0 ft) SW of
utility pole #28203.  The bench mark is set 6 cm (0.2 ft) above ground, crimped
to the top of a copper-clad steel rod driven an unspecified depth to refusal,
and encased in an ABS pipe with concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                                                
Station ID: 8662071                         PUBLICATION DATE:  06/28/2004
Name:       PAWLEYS INLET, WARDS DOCK                         
            SC
NOAA Chart: 11534                           Latitude:   33° 24.7' N (  33.41170)
USGS Quad:  WAVERLY MILLS                   Longitude:  79°  8.1' W ( -79.13500)


                            T I D A L   D A T U M S 


Tidal datums at PAWLEYS INLET, WARDS DOCK based on:

     LENGTH OF SERIES:      7 Months
     TIME PERIOD:           December 1975 - November 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:

     MEAN HIGHER HIGH WATER                     MHHW   =  1.165
     MEAN HIGH WATER                            MHW    =  1.068
     MEAN SEA LEVEL                             MSL    =  0.586
     MEAN TIDE LEVEL                            MTL    =  0.561
     North American Vertical Datum              NAVD88 =  0.524
     MEAN LOW WATER                             MLW    =  0.055
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     WD NO 1 1975                                1.839    0.771
     WD NO 3 1975                                2.253    1.185
     WD NO 4 1975                                2.803    1.735


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  4

                                                                                
Station ID: 8662071                         PUBLICATION DATE:  06/28/2004
Name:       PAWLEYS INLET, WARDS DOCK                         
            SC
NOAA Chart: 11534                           Latitude:   33° 24.7' N (  33.41170)
USGS Quad:  WAVERLY MILLS                   Longitude:  79°  8.1' W ( -79.13500)


                             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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