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Bench Mark Sheet for 8667733, SAMS POINT, LUCY 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 8667733                         PUBLICATION DATE:  04/23/2010
Name:       SAMS POINT, LUCY POINT CREEK                      
            SC
NOAA Chart: 11513                           Latitude:   32° 29.0' N (  32.48330)
USGS Quad:  FROGMORE                        Longitude:  80° 36.0' W ( -80.60000)


To reach the tidal bench marks from the Richard V. Woods Memorial Bridge in
Beaufort, proceed 3.1 km (1.9 mi) south on U.S. Highway 21 to State Highway 802
(Sams Point Road), then turn left and proceed north on State Highway 802 for
10.3 km (6.4 mi) to State Road S-7-264, then proceed north on State Road S-7-264
for 0.5 km (0.3 mi) to the crab house dock.  The bench marks are located along a
paved road leading NE from the crab house.  The tide gage and staff were located
on the crab house dock adjacent to the boat landing.


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


                 PRIMARY BENCH MARK STAMPING:  7733 A 1977
                         DESIGNATION:          866 7733 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4384
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2393
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   32° 29.1' N (  32.48500)          LONGITUDE:  80° 36.0' W ( -80.60000)


The primary bench mark is a disk located in front of the crab house, 40.23 m
(132.0 ft) SE of bench mark 7733 B 1977, 9.24 m (30.3 ft) NW of the NE corner of
the concrete boat ramp, 7.50 m (24.6 ft) WSW of the west end of the pier leading
into the crab house, and 2.80 m (9.2 ft) west of utility pole #188868.  The
bench mark is set level with the ground, crimped to the top of a galvanized
steel rod driven 6.4 m (21 ft) to refusal and encased in PVC pipe and a concrete
kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8667733                         PUBLICATION DATE:  04/23/2010
Name:       SAMS POINT, LUCY POINT CREEK                      
            SC
NOAA Chart: 11513                           Latitude:   32° 29.0' N (  32.48330)
USGS Quad:  FROGMORE                        Longitude:  80° 36.0' W ( -80.60000)


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


                         BENCH MARK STAMPING:  7733 B 1977
                         DESIGNATION:          866 7733 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4385
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2392
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 29.1' N (  32.48500)          LONGITUDE:  80° 36.0' W ( -80.60000)


The bench mark is a disk set flush in a concrete monument, 40.23 m (132.0 ft) NW
of bench mark 7733 A 1977, 11.77 m (38.6 ft) south of a telephone company
underground cable box #RP-62, and 5.79 m (19.0 ft) SW of the centerline of State
Road S-7-264, 3 m (10 ft) NW of a 4-foot diameter live oak tree with a Y in it.



                         BENCH MARK STAMPING:  7733 C 1977
                         DESIGNATION:          866 7733 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4386
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CK2394
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   32° 29.1' N (  32.48500)          LONGITUDE:  80° 36.0' W ( -80.60000)


The bench mark is a disk located on the west side of the road from the crab
house, 52.18 m (171.2 ft) SW of bench mark 7733 E 1977, 39.20 m (128.6 ft) NW of
bench mark 7733 D 1977, 6.40 m (21.0 ft) NW of the centerline of State Road
S-7-264, 2.16 m (7.1 ft) west of utility pole #225327, and 2.01 m (6.6 ft) north
of a metal anchor supporting a utility pole guy wire.  The bench mark is at
ground level, crimped to the top of a galvanized rod driven 8.5 m (28 ft) to
refusal and encased in PVC pipe and a concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8667733                         PUBLICATION DATE:  04/23/2010
Name:       SAMS POINT, LUCY POINT CREEK                      
            SC
NOAA Chart: 11513                           Latitude:   32° 29.0' N (  32.48330)
USGS Quad:  FROGMORE                        Longitude:  80° 36.0' W ( -80.60000)


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


                         BENCH MARK STAMPING:  7733 D 1977
                         DESIGNATION:          866 7733 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4387
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   32° 29.0' N (  32.48330)          LONGITUDE:  80° 35.9' W ( -80.59830)


The bench mark is a disk located 39.20 m (128.6 ft) SE of bench mark 7733 C
1977, 27.01 m (88.6 ft) south of the SE corner of a private residence with a
pool, and 5.70 m (18.7 ft) NW of the shoreline.  The bench mark is set level
with the ground, crimped to the top of a galvanized steel rod driven 8.5 m (28
ft) to refusal, and encased in PVC pipe and a concrete kickblock.



                         BENCH MARK STAMPING:  7733 E 1977
                         DESIGNATION:          866 7733 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4388
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   32° 29.0' N (  32.48330)          LONGITUDE:  80° 35.9' W ( -80.59830)


The bench mark is a disk 52.18 m (171.2 ft) NE of bench mark 7733 C 1977, 23.62
m (77.5 ft) ENE of utility pole #146231, 15.64 m (51.3 ft) WNW of a palmetto
tree adjacent to the concrete swimming pool at the private residence, 4.33 m
(14.2 ft) east of the centerline of State Road S-7-264, and at ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8667733                         PUBLICATION DATE:  04/23/2010
Name:       SAMS POINT, LUCY POINT CREEK                      
            SC
NOAA Chart: 11513                           Latitude:   32° 29.0' N (  32.48330)
USGS Quad:  FROGMORE                        Longitude:  80° 36.0' W ( -80.60000)


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


                         BENCH MARK STAMPING:  7733 F 1978
                         DESIGNATION:          866 7733 F TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4389
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete bridge abutment              OPUS PID:        
LATITUDE:   32° 29.0' N (  32.48330)          LONGITUDE:  80° 35.9' W ( -80.59830)


The bench mark is a disk at the SE corner of the bridge over Lucy Point Creek,
7.44 m (24.4 ft) NE of the SE end of the bridge, 3.66 m (12.0 ft) NE of the
centerline of State Highway 802, 2.56 m (8.4 ft) NE of the NE edge of the
abutment, and 0.21 m (0.7 ft) above road level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8667733                         PUBLICATION DATE:  04/23/2010
Name:       SAMS POINT, LUCY POINT CREEK                      
            SC
NOAA Chart: 11513                           Latitude:   32° 29.0' N (  32.48330)
USGS Quad:  FROGMORE                        Longitude:  80° 36.0' W ( -80.60000)


                            T I D A L   D A T U M S 


Tidal datums at SAMS POINT, LUCY POINT CREEK based on:

     LENGTH OF SERIES:      9 MONTHS
     TIME PERIOD:           June 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:

     MEAN HIGHER HIGH WATER                     MHHW   =  2.205
     MEAN HIGH WATER                            MHW    =  2.096
     North American Vertical Datum              NAVD88 =  1.246
     MEAN SEA LEVEL                             MSL    =  1.205
     MEAN TIDE LEVEL                            MTL    =  1.082
     MEAN LOW WATER                             MLW    =  0.068
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     7733 A 1977                                 3.145    1.049
     7733 B 1977                                 4.090    1.994
     7733 C 1977                                 4.039    1.943
     7733 D 1977                                 2.596    0.500
     7733 E 1977                                 3.736    1.640
     7733 F 1978                                 6.650    4.554


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  6

                                                                                
Station ID: 8667733                         PUBLICATION DATE:  04/23/2010
Name:       SAMS POINT, LUCY POINT CREEK                      
            SC
NOAA Chart: 11513                           Latitude:   32° 29.0' N (  32.48330)
USGS Quad:  FROGMORE                        Longitude:  80° 36.0' W ( -80.60000)


                             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 8667733 SAMS POINT, LUCY POINT CREEK, SC

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