Bench Mark Sheet for 8661299, LOWER TOPSAW LANDING, PEE DEE RIVER 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8661299                         PUBLICATION DATE:  05/20/2004
Name:       LOWER TOPSAW LANDING, PEE DEE RIVER               
            SC
NOAA Chart: 11535                           Latitude:   33° 36.5' N (  33.60830)
USGS Quad:  PLANTERSVILLE                   Longitude:  79°  9.1' W ( -79.15170)


To reach the tidal bench marks from the intersection of U.S. Routes 701 and 707
in Yauhannah, proceed south on U.S. Route 701 for 1.9 km (1.2 mi), then turn
left and proceed east on S-22-264 for 0.5 km (0.3 mi), then continue east on a
dirt road with a lower Topsaw sign for 4.2 km (2.6 mi).  The bench marks are
along the dirt road leading to the Pee Dee River and the adjacent open area next
to the forest.  The tide gage and staff were located on a platform extending
from the top of the bluff to just over the river.


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


                 PRIMARY BENCH MARK STAMPING:  1299 D 1981
                         DESIGNATION:          866 1299 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3754
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2324
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   33° 36.5' N (  33.60830)          LONGITUDE:  79°  9.0' W ( -79.15000)


The primary bench mark is a disk located 56.51 m (185.4 ft) SSW of bench mark
Topsaw NO 4 1934, 14.87 m (48.8 ft) WSW of the western face of a 0.91 m (3.0 ft)
diameter oak tree, and 2.13 m (7.0 ft) east of the east face of a 0.61 m (2.0
ft) diameter pine tree.  The bench mark is set level with ground, crimped to the
top of a galvanized steel rod driven 4.9 m (16 ft) to refusal, and encased in
5-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: 8661299                         PUBLICATION DATE:  05/20/2004
Name:       LOWER TOPSAW LANDING, PEE DEE RIVER               
            SC
NOAA Chart: 11535                           Latitude:   33° 36.5' N (  33.60830)
USGS Quad:  PLANTERSVILLE                   Longitude:  79°  9.1' W ( -79.15170)


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


                         BENCH MARK STAMPING:  TOPSAW NO 4 1934
                         DESIGNATION:          TOPSAW RM 4

MONUMENTATION:           Reference Mark disk                   VM#:         3752
AGENCY:                  US Coast & Geodetic Survey
                         (USC&GS)                                 IDB PID#:  DD2322
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   33° 36.5' N (  33.60830)          LONGITUDE:  79°  9.1' W ( -79.15170)


The bench mark is a disk set flush in a square concrete monument, 9.60 m (31.5
ft) WSW of a bluff drop overlooking the River, 6.71 m (22.0 ft) SSW of an 0.5 m
(1.5 ft) diameter pine tree, 0.40 m (1.3 ft) SSW of a witness post with a sign,
and is at ground level.

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

                                                                                
Station ID: 8661299                         PUBLICATION DATE:  05/20/2004
Name:       LOWER TOPSAW LANDING, PEE DEE RIVER               
            SC
NOAA Chart: 11535                           Latitude:   33° 36.5' N (  33.60830)
USGS Quad:  PLANTERSVILLE                   Longitude:  79°  9.1' W ( -79.15170)


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


                         BENCH MARK STAMPING:  TOPSAW NO 5 1934
                         DESIGNATION:          TOPSAW RM 5

MONUMENTATION:           Reference Mark disk                   VM#:         3753
AGENCY:                  US Coast & Geodetic Survey
                         (USC&GS)                                 IDB PID#:  DD2323
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   33° 36.5' N (  33.60830)          LONGITUDE:  79°  9.1' W ( -79.15170)


The bench mark is a disk set flush in a square concrete monument, 45.08 m (147.9
ft) WSW of bench mark TOPSAW NO 4 1934, 25.91 m (85.0 ft) SSW of the SW corner
of a one room shack, 21.03 m (69.0 ft) SE of an unmarked power pole, 8.20 m
(26.9 ft) NNE of a triple oak tree, 0.15 m (0.5 ft) NW of a witness post with a
sign, and level with the ground.



                         BENCH MARK STAMPING:  1299 E 1981
                         DESIGNATION:          866 1299 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3755
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2320
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   33° 36.5' N (  33.60830)          LONGITUDE:  79°  9.2' W ( -79.15330)


The bench mark is a disk located 9.66 m (31.7 ft) north of a 0.46 m (1.5 ft)
diameter pine tree, 4.36 m (14.3 ft) north of the centerline of the dirt road
leading to the river, 2.13 m (7.0 ft) south of a drop to a large drainage ditch,
and 0.64 m (2.1 ft) SSW of an unnumbered power pole.  The bench mark is set 3 cm
(0.1 ft) above the ground, crimped to the top of a galvanized steel rod driven
8.5 m (28 ft) to refusal, and encased in a 5-inch PVC pipe and concrete
kickblock.

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

                                                                                
Station ID: 8661299                         PUBLICATION DATE:  05/20/2004
Name:       LOWER TOPSAW LANDING, PEE DEE RIVER               
            SC
NOAA Chart: 11535                           Latitude:   33° 36.5' N (  33.60830)
USGS Quad:  PLANTERSVILLE                   Longitude:  79°  9.1' W ( -79.15170)


                            T I D A L   D A T U M S 


Tidal datums at LOWER TOPSAW LANDING, PEE DEE RIVER based on:

     LENGTH OF SERIES:      7 MONTHS
     TIME PERIOD:           January 1982 - July 1982
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8661139 BUCKSPORT, WACCAMAW RIVER


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.345
     MEAN HIGH WATER                            MHW    =  0.323
     MEAN SEA LEVEL                             MSL    =  0.206
     MEAN TIDE LEVEL                            MTL    =  0.177
     MEAN LOW WATER                             MLW    =  0.031
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     North American Vertical Datum              NAVD88 = -0.523

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     1299 D 1981                                 2.843    2.520
     TOPSAW NO 4 1934                            3.479    3.156
     TOPSAW NO 5 1934                            3.131    2.808
     1299 E 1981                                 3.796    3.473


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

                                                                                
Station ID: 8661299                         PUBLICATION DATE:  05/20/2004
Name:       LOWER TOPSAW LANDING, PEE DEE RIVER               
            SC
NOAA Chart: 11535                           Latitude:   33° 36.5' N (  33.60830)
USGS Quad:  PLANTERSVILLE                   Longitude:  79°  9.1' W ( -79.15170)


                             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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