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Bench Mark Sheet for 8667982, JENKINS 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8667982                         PUBLICATION DATE:  02/05/2004
Name:       JENKINS CREEK                                     
            SC
NOAA Chart: 11519                           Latitude:   32° 26.4' N (  32.44000)
USGS Quad:  FROGMORE                        Longitude:  80° 33.2' W ( -80.55330)


To reach the bench marks from the U.S. Post Office in Frogmore, proceed east on
U.S. Highway 21 for 1.4 km (0.9 mi) to County Road S-7-74, then turn left on
County Road S-7-74 and proceed north for 5.1 km (3.2 mi), then turn left onto a
dirt road and proceed for 0.3 km (0.2 mi) to Jenkins Creek.  The bench marks are
along County Road S-7-74 and along the dirt road.  The tide station were located
on the dock by the shrimp house.


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


                 PRIMARY BENCH MARK STAMPING:  7982 A 1981
                         DESIGNATION:          866 7982 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4425
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2322
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   32° 26.4' N (  32.44000)          LONGITUDE:  80° 33.0' W ( -80.55000)


The primary bench mark is a disk located near the gate of the fence surrounding
the shrimp house, 7.62 m (25.0 ft) SSE of the centerline of the dirt road
entrance through the gate, 7.35 m (24.1 ft) east of the hinged side of the gate
post, 2.13 m (7.0 ft) south of the center of power pole #189304, and 1.71 m (5.6
ft) NW of a guy wire anchor.  The bench mark is set at ground level, crimped to
the top of a stainless steel rod driven 11.0 m (35.8 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: 8667982                         PUBLICATION DATE:  02/05/2004
Name:       JENKINS CREEK                                     
            SC
NOAA Chart: 11519                           Latitude:   32° 26.4' N (  32.44000)
USGS Quad:  FROGMORE                        Longitude:  80° 33.2' W ( -80.55330)


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


                         BENCH MARK STAMPING:  7982 C 1981
                         DESIGNATION:          866 7982 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4426
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2321
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   32° 26.4' N (  32.44000)          LONGITUDE:  80° 33.0' W ( -80.55000)


The bench mark is a disk located near a power pole with a phone junction box
attached, 10.06 m (33.0 ft) NNE of a 0.61 m (2.0 ft) diameter double oak tree,
5.18 m (17.0 ft) SSE of the centerline of the dirt road leading to the dock,
5.09 m (16.7 ft) WSW of the centerline of a dirt drive to a mobile home, and
2.01 m (6.6 ft) ENE of a guy wire anchor for power pole #225317.  The bench mark
is set at ground level, crimped to the top of a stainless steel rod driven 11.0
m (35.8 ft) to refusal, and encased in a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  7982 F 1981
                         DESIGNATION:          866 7982 F TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4427
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2320
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 26.5' N (  32.44170)          LONGITUDE:  80° 32.9' W ( -80.54830)


The bench mark is a disk set in the top of a concrete monument located on the
south side of the dirt road, 101 m (330 ft) east of bench mark 7982 C 1981,
34.66 m (113.7 ft) SSE of power pole #225-25-9, 6.00 m (19.7 ft) SSE of the
centerline of the dirt road, 0.67 m (2.2 ft) SSW of power pole #P9-25-2, and
0.09 m (0.3 ft) above ground level.

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

                                                                                
Station ID: 8667982                         PUBLICATION DATE:  02/05/2004
Name:       JENKINS CREEK                                     
            SC
NOAA Chart: 11519                           Latitude:   32° 26.4' N (  32.44000)
USGS Quad:  FROGMORE                        Longitude:  80° 33.2' W ( -80.55330)


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


                         BENCH MARK STAMPING:  7982 G 1981
                         DESIGNATION:          866 7982 G TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4428
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2319
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 26.4' N (  32.44000)          LONGITUDE:  80° 32.8' W ( -80.54670)


The bench mark is a disk set in the top of a concrete monument located in the NW
angle of the intersection with a sand road, 24.93 m (81.8 ft) ESE of the SE
corner of a one-story house that is 1.5 m (5 ft) off the ground on stilts, 23.65
m (77.6 ft) ENE of the centerline of a sand drive in front of the house, 8.41 m
(27.6 ft) NW of the centerline of County Road S-7-74, 7.38 m (24.2 ft) SW of the
centerline of the dirt road, 3.93 m (12.9 ft) ENE of a 0.30 m (1.0 ft) diameter
palmetto tree, 1.98 m (6.5 ft) WSW of a 1.83 m (6.0 ft) tall creosote post, and
0.3 m (1 ft) above County Road S-7-74.



                         BENCH MARK STAMPING:  7982 H 1981
                         DESIGNATION:          866 7982 H TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4429
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 26.4' N (  32.44000)          LONGITUDE:  80° 33.2' W ( -80.55330)


The bench mark is a disk set in the top of a concrete monument located on the
north side of County Road S-7-74, 100.1 m (328.5 ft) ENE of bench mark 7982 G
1981, 12.68 m (41.6 ft) WSW of a stop sign, 8.47 m (27.8 ft) NNE of the
centerline of County Road S-7-74, 2.65 m (8.7 ft) WSW of the center of telephone
box #RP926, and 0.06 m (0.2 ft) above ground level.

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

                                                                                
Station ID: 8667982                         PUBLICATION DATE:  02/05/2004
Name:       JENKINS CREEK                                     
            SC
NOAA Chart: 11519                           Latitude:   32° 26.4' N (  32.44000)
USGS Quad:  FROGMORE                        Longitude:  80° 33.2' W ( -80.55330)


                            T I D A L   D A T U M S 


Tidal datums at JENKINS CREEK based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           March 1981 - May 1981
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8670870 FORT PULASKI, SAVANNAH RIVER


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:

     MEAN HIGHER HIGH WATER                     MHHW   =  2.248
     MEAN HIGH WATER                            MHW    =  2.137
     North American Vertical Datum              NAVD88 =  1.248
     MEAN SEA LEVEL                             MSL    =  1.189
     MEAN TIDE LEVEL                            MTL    =  1.100
     MEAN LOW WATER                             MLW    =  0.063
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     7982 A 1981                                 2.829    0.692
     7982 C 1981                                 4.412    2.275
     7982 F 1981                                 4.268    2.131
     7982 G 1981                                 3.648    1.511
     7982 H 1981                                 3.867    1.730


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

                                                                                
Station ID: 8667982                         PUBLICATION DATE:  02/05/2004
Name:       JENKINS CREEK                                     
            SC
NOAA Chart: 11519                           Latitude:   32° 26.4' N (  32.44000)
USGS Quad:  FROGMORE                        Longitude:  80° 33.2' W ( -80.55330)


                             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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Revised: 08/08/2018
NOAA / National Ocean Service
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