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Bench Mark Sheet for 8665589, SANDBLASTERS, PENNYS 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8665589                         PUBLICATION DATE:  03/09/2004
Name:       SANDBLASTERS, PENNY'S CREEK                       
            SC
NOAA Chart: 11522                           Latitude:   32° 46.2' N (  32.77000)
USGS Quad:  JOHNS ISLAND                    Longitude:  80°  3.8' W ( -80.06330)


To reach the tidal bench marks from intersection of Main Road and US Highway 17,
proceed south on Main Road for 2.7 km (1.7 mi), then turn left and proceed east
on River Road for 4.2 km (2.6 mi) to a road leading to Sandblasters Inc.
(Swygert Boulevard).  The bench marks are along the Swygert Boulevard.  The tide
gage and staff were located on dock perpendicular to the north corner of the
bridge over Penny's Creek.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1974
                         DESIGNATION:          866 5589 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:         4200
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2722
SETTING CLASSIFICATION:  Floor of bridge                       OPUS PID:        
LATITUDE:   32° 46.1' N (  32.76830)          LONGITUDE:  80°  3.8' W ( -80.06330)


The primary bench mark is a disk set flush in the floor of the bridge, located
in the north corner of the bridge over Pennys Creek leading to Sandblasters
Inc., 4.27 m (14.0 ft) WNW of center of bridge causeway, 2.44 m (8.0 ft) from
the NW end of bridge, and 2.26 m (7.4 ft) SSW of north corner of bridge.

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

                                                                                
Station ID: 8665589                         PUBLICATION DATE:  03/09/2004
Name:       SANDBLASTERS, PENNY'S CREEK                       
            SC
NOAA Chart: 11522                           Latitude:   32° 46.2' N (  32.77000)
USGS Quad:  JOHNS ISLAND                    Longitude:  80°  3.8' W ( -80.06330)


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


                         BENCH MARK STAMPING:  NO 2 1974
                         DESIGNATION:          866 5589 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:         4201
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2723
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 46.2' N (  32.77000)          LONGITUDE:  80°  3.7' W ( -80.06170)


The bench mark is a disk set flush in a concrete monument, located 26.52 m (87.0
ft) WNW of center of sand road, 4 m (13 ft) SW of approximate center of two main
entrance doors to office building, 1.07 m (3.5 ft) SSW of SE corner of office
building and is at ground level.



                         BENCH MARK STAMPING:  NO 3 1974
                         DESIGNATION:          866 5589 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:         4202
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2724
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 46.2' N (  32.77000)          LONGITUDE:  80°  3.7' W ( -80.06170)


The bench mark is a disk set flush in a concrete monument, located 31 m (102 ft)
SSW of the approximate center of sand road leading to a junk pile surrounded by
a chain link fence, 30.48 m (100.0 ft) SE of Sandblasters Inc. door, 21.79 m
(71.5 ft) south of power pole with street light, 19.35 m (63.5 ft) NNW of bench
mark NO 4 1974, 18.44 m (60.5 ft) ESE of approximate center of main sand road,
4.88 m (16.0 ft) east of the easternmost of two live oak trees, 2.44 m (8.0 ft)
north of marsh line, 0.37 m (1.2 ft) SSW of witness post with sign, and level
with ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                                                
Station ID: 8665589                         PUBLICATION DATE:  03/09/2004
Name:       SANDBLASTERS, PENNY'S CREEK                       
            SC
NOAA Chart: 11522                           Latitude:   32° 46.2' N (  32.77000)
USGS Quad:  JOHNS ISLAND                    Longitude:  80°  3.8' W ( -80.06330)


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


                         BENCH MARK STAMPING:  NO 4 1974
                         DESIGNATION:          866 5589 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:         4203
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2725
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 46.2' N (  32.77000)          LONGITUDE:  80°  3.7' W ( -80.06170)


The bench mark is a disk set flush in a concrete monument, located 36.27 m
(119.0 ft) SSW of center of sand road leading to a junk pile surrounded by a
chain fence, 31.30 m (102.7 ft) WNW of chain link fence line, 19.35 m (63.5 ft)
SSE of bench mark NO 3 1978, 4.27 m (14.0 ft) NNE of marsh line, 1.22 m (4.0 ft)
WSW of power pole with witness sign, 0.40 m (1.3 ft) south of witness post with
sign, and at ground level.



                         BENCH MARK STAMPING:  NO 5 1974
                         DESIGNATION:          866 5589 TIDAL 5

MONUMENTATION:           Tidal Station disk                    VM#:         4204
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2726
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 46.2' N (  32.77000)          LONGITUDE:  80°  3.7' W ( -80.06170)


The bench mark is a disk set flush in a concrete monument, located 36 m (118 ft)
SSW of the center of a sand road to a junk pile, 29.50 m (96.8 ft) ESE of bench
mark NO 4 1974, 4.88 m (16.0 ft) west of unused power pole, 2.44 m (8.0 ft) NNE
of marsh line, 1.83 m (6.0 ft) WNW of chain link fence line, 6 cm (0.2 ft) NNW
of metal witness post, and at ground level.  NOTE: Mark recovered in poor
condition in 2001 by US Power Squadron.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                                                
Station ID: 8665589                         PUBLICATION DATE:  03/09/2004
Name:       SANDBLASTERS, PENNY'S CREEK                       
            SC
NOAA Chart: 11522                           Latitude:   32° 46.2' N (  32.77000)
USGS Quad:  JOHNS ISLAND                    Longitude:  80°  3.8' W ( -80.06330)


                            T I D A L   D A T U M S 


Tidal datums at SANDBLASTERS, PENNY'S CREEK based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           May 1974 - July 1974
     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   =  1.772
     MEAN HIGH WATER                            MHW    =  1.688
     MEAN SEA LEVEL                             MSL    =  1.030
     North American Vertical Datum              NAVD88 =  1.018
     MEAN TIDE LEVEL                            MTL    =  0.886
     MEAN LOW WATER                             MLW    =  0.084
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1974                                   3.533    1.845
     NO 2 1974                                   3.291    1.603
     NO 3 1974                                   2.586    0.898
     NO 4 1974                                   2.188    0.500
     NO 5 1974                                   1.978    0.290


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

                                                                                
Station ID: 8665589                         PUBLICATION DATE:  03/09/2004
Name:       SANDBLASTERS, PENNY'S CREEK                       
            SC
NOAA Chart: 11522                           Latitude:   32° 46.2' N (  32.77000)
USGS Quad:  JOHNS ISLAND                    Longitude:  80°  3.8' W ( -80.06330)


                             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 8665589 SANDBLASTERS, PENNYS CREEK, SC

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