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Bench Mark Sheet for 8667972, EDDINGS POINT 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8667972                         PUBLICATION DATE:  02/05/2004
Name:       EDDINGS POINT CREEK                               
            SC
NOAA Chart: 11519                           Latitude:   32° 26.8' N (  32.44670)
USGS Quad:  FROGMORE                        Longitude:  80° 32.0' W ( -80.53330)


To reach the tidal bench marks from the post office in Frogmore, proceed east on
U.S. Highway 21 for 1.3 km (0.8 mi) to Eddings Point Road (County Road S-7-74),
then NNE on Eddings Point Road for 7.1 km (4.4 mi) to a sand drive with brick
pillars at the entrance.  The bench marks are along the fence line and at the
Sutcliff residence.  The tide gage and staff were located on the pier behind the
Sutcliff residence.


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


                 PRIMARY BENCH MARK STAMPING:  7972 A 1978
                         DESIGNATION:          866 7972 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4420
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2324
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   32° 26.8' N (  32.44670)          LONGITUDE:  80° 32.0' W ( -80.53330)


The primary bench mark is a disk located at the NE side of a breezeway which is
connected to a 2-story block house, 27.74 m (91.0 ft) SSW of the SE corner of a
2-story brick and wood house, 18.29 m (60.0 ft) NNW of the center of the
entrance to a wooden pier, 11.58 m (38.0 ft) WNW of the edge of a 1 m (4 ft)
bank (high water line), and 1.52 m (5.0 ft) NNE of the NE end of the breezeway. 
The bench mark is set at ground level, crimped to the top of a galvanized steel
rod driven 13.7 m (45 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: 8667972                         PUBLICATION DATE:  02/05/2004
Name:       EDDINGS POINT CREEK                               
            SC
NOAA Chart: 11519                           Latitude:   32° 26.8' N (  32.44670)
USGS Quad:  FROGMORE                        Longitude:  80° 32.0' W ( -80.53330)


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


                         BENCH MARK STAMPING:  7972 B 1978
                         DESIGNATION:          866 7972 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4421
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2325
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 26.8' N (  32.44670)          LONGITUDE:  80° 32.0' W ( -80.53330)


The bench mark is a disk set in a concrete monument in the front yard of a
2-story block house with breezeway, 48.46 m (159.0 ft) NNW of the SW corner of
the block house, 21.92 m (71.9 ft) NNE of a 1 m (3 ft) water pipe sticking out
of the ground, 3.66 m (12.0 ft) WNW of the centerline of a grassy drive, 1.74 m
(5.7 ft) SSE of utility pole #61680 with transformer and yard light, and at
ground level.



                         BENCH MARK STAMPING:  7972 C 1978
                         DESIGNATION:          866 7972 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4422
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2323
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   32° 26.8' N (  32.44670)          LONGITUDE:  80° 32.1' W ( -80.53500)


The bench mark is a disk located near a brick pillar at the end of the pavement
for Eddings Point Road, 28.35 m (93.0 ft) NNE of a fire hydrant, 10.36 m (34.0
ft) ENE of the centerline of the sand road, 2.96 m (9.7 ft) NNW of the brick
pillar, 0.85 m (2.8 ft) NNW of the brick pillar, and 0.79 m (2.6 ft) WSW of a
wooden fence.  The bench mark is set 0.61 m (2.0 ft) above the sand road,
crimped to the top of a galvanized steel rod driven 11.6 m (38 ft) to refusal,
and encased in a 4-inch PVC pipe and kickblock.

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

                                                                                
Station ID: 8667972                         PUBLICATION DATE:  02/05/2004
Name:       EDDINGS POINT CREEK                               
            SC
NOAA Chart: 11519                           Latitude:   32° 26.8' N (  32.44670)
USGS Quad:  FROGMORE                        Longitude:  80° 32.0' W ( -80.53330)


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


                         BENCH MARK STAMPING:  7972 D 1978
                         DESIGNATION:          866 7972 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4423
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2327
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 26.8' N (  32.44670)          LONGITUDE:  80° 32.1' W ( -80.53500)


The bench mark is a disk set in a concrete monument located along the sand road
near two 1 m (2 ft) diameter palmetto trees and a 0.3 m (1 ft) diameter leaning
oak tree, 85 m (279 ft) SSE of bench mark 7972 E 1978, 84 m (276 ft) NNW of
bench mark 7972 C 1978, 6.40 m (21.0 ft) ENE of the centerline of the sand road
leading NW, and 0.61 m (2.0 ft) above the sand road.



                         BENCH MARK STAMPING:  7972 E 1978
                         DESIGNATION:          866 7972 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4424
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2326
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   32° 26.8' N (  32.44670)          LONGITUDE:  80° 32.1' W ( -80.53500)


The bench mark is a disk located near the north entrance drive to the 2-story
block house near a brick monument, 18.90 m (62.0 ft) NNE of utility pole
#267974, 7 m (23 ft) NNW of the centerline of the sand drive leading to the
block house, 6.71 m (22.0 ft) NE of the centerline of the sand road leading NW,
and 0.91 m (3.0 ft) WNW of the NE end of the brick monument.  The bench mark is
set 6 cm (0.2 ft) above ground level, crimped to the top of a galvanized steel
rod driven 12.5 m (41 ft), and encased in a PVC pipe and concrete kickblock.

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

                                                                                
Station ID: 8667972                         PUBLICATION DATE:  02/05/2004
Name:       EDDINGS POINT CREEK                               
            SC
NOAA Chart: 11519                           Latitude:   32° 26.8' N (  32.44670)
USGS Quad:  FROGMORE                        Longitude:  80° 32.0' W ( -80.53330)


                            T I D A L   D A T U M S 


Tidal datums at EDDINGS POINT CREEK based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           March 1978 - February 1979
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8667999 BEAUFORT


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

     HIGHEST OBSERVED WATER LEVEL (07/19/1978)         =  2.650
     MEAN HIGHER HIGH WATER                     MHHW   =  2.129
     MEAN HIGH WATER                            MHW    =  2.018
     North American Vertical Datum              NAVD88 =  1.179
     MEAN SEA LEVEL                             MSL    =  1.121
     MEAN TIDE LEVEL                            MTL    =  1.041
     MEAN LOW WATER                             MLW    =  0.064
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/29/1979)         = -0.850

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     7972 A 1978                                 2.723    0.705
     7972 B 1978                                 2.796    0.778
     7972 C 1978                                 3.559    1.541
     7972 D 1978                                 3.602    1.584
     7972 E 1978                                 3.318    1.300


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

                                                                                
Station ID: 8667972                         PUBLICATION DATE:  02/05/2004
Name:       EDDINGS POINT CREEK                               
            SC
NOAA Chart: 11519                           Latitude:   32° 26.8' N (  32.44670)
USGS Quad:  FROGMORE                        Longitude:  80° 32.0' W ( -80.53330)


                             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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