Superseded Bench Mark Sheet for 8661139, BUCKSPORT, WACCAMAW RIVER SC

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                   PUBLICATION DATE:  01/20/1988
Station ID: 8661139                                SUPERCEDED DATE:   04/21/2003
Name:       BUCKSPORT, WACCAMAW RIVER                         
            SOUTH CAROLINA
NOAA Chart: 11535                                  Latitude:         33° 38.8' N
USGS Quad:  BUCKSVILLE                             Longitude:        79°  5.7' W


To reach the tidal bench marks from the junction of U.S. Highway 501 and State
Highway 378 (SC 378) in Conway, proceed east on SC 378 for 0.2 mile (0.3 km) to
U.S. Highway 701, turn right and go south on U.S. Highway 701 for 11.4 miles
(18.3 km) to State Road S 26 48, turn left and go east on S 26 48 for 3.2 miles
(5.1 km) to the roads end at Bucksport Marina.  The bench marks are located on
the marina grounds.  The tide gage and staff were located 0.1 mile (0.2 km) SE
of the roads end at the large tin boat shed.


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


                 PRIMARY BENCH MARK STAMPING:  BUCKS NO 7 1975

MONUMENTATION:           Survey Disk                               VM#:      580
AGENCY:                                                            PID#:  DD2368
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is at Bucksport Marina, 204.3 feet (62.3 m) NW of Bench Mark
BUCKS NO 6 1975, 134.0 feet (40.8 m) ENE of the SE corner of an abandoned wood
shingle house with brick foundation, 48.6 feet (14.8 m) NW of a 3-foot (1 m)
diameter oak tree, 32.3 feet (9.8 m) NE of the centerline of the dirt road
extension of S 26 48, and 3.7 feet (1.1 m) NE of utility pole #275.  The bench
mark is level with the ground, crimped to a copper-clad steel rod driven an
unspecified depth to refusal, and encased in a 4-inch PVC pipe and concrete
kickblock.



                         BENCH MARK STAMPING:  BUCKS NO 6 1975

MONUMENTATION:           Survey Disk                               VM#:      582
AGENCY:                                                            PID#:  DD2369
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is at Bucksport Marina, 176.8 feet (53.9 m) west of the
southernmost of two Phillips 66 signs, 76.1 feet (23.2 m) east of the centerline
of the dirt road extension of S 26 48, 36.8 feet (11.2 m) north of the
centerline of a dirt road leading to a tin boat wharf, and 5.7 feet     (1.7 m)
north of utility pole 2X3.  The bench mark is level with the ground, crimped to
a copper-clad steel rod driven an unspecified depth 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  4

                                                   PUBLICATION DATE:  01/20/1988
Station ID: 8661139                                SUPERCEDED DATE:   04/21/2003
Name:       BUCKSPORT, WACCAMAW RIVER                         
            SOUTH CAROLINA
NOAA Chart: 11535                                  Latitude:         33° 38.8' N
USGS Quad:  BUCKSVILLE                             Longitude:        79°  5.7' W


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


                         BENCH MARK STAMPING:  1139 A 1982

MONUMENTATION:           Survey Disk                               VM#:      583
AGENCY:                                                            PID#:  DD2370
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set flush in the top of a concrete monument at Bucksport
Marina, 180.0 feet (54.9 m) ENE of Bench Mark BUCKS NO 6 1975, 74.8 feet    
(22.8 m) WNW of a utility pole at the NE end of the boat ramp, 67 feet (20 m)
west of the river edge, 40.0 feet (12.2 m) east of the centerline of the dirt
road leading from the boat ramp to the marina store, 1.7 feet (0.5 m) SE of the
SE face of a concrete base of the southernmost of two Phillips 66 signs, and
level with the ground.



                         BENCH MARK STAMPING:  1139 C 1982

MONUMENTATION:           Survey Disk                               VM#:      584
AGENCY:                                                            PID#:  DD2366
SETTING CLASSIFICATION:  Stainless Steel Rod


The bench mark is at Bucksport Marina, 186.6 feet (56.9 m) SW of the SW face of
the two-story garage and marina store, 40.8 feet (12.4 m) SE of the centerline
of a road leading around the north side of the garage and marina store, 25.8
feet (7.9 m) NE of the centerline of S 26 48, and 1.6 feet (0.5 m) NW of an
unmarked utility pole.  The bench mark is level with the ground, crimped to a
stainless steel rod driven an unspecified depth 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  3 of  4

                                                   PUBLICATION DATE:  01/20/1988
Station ID: 8661139                                SUPERCEDED DATE:   04/21/2003
Name:       BUCKSPORT, WACCAMAW RIVER                         
            SOUTH CAROLINA
NOAA Chart: 11535                                  Latitude:         33° 38.8' N
USGS Quad:  BUCKSVILLE                             Longitude:        79°  5.7' W


                            T I D A L   D A T U M S 


Tidal datums at BUCKSPORT, WACCAMAW RIVER based on:

     LENGTH OF SERIES:      90 MONTHS
     TIME PERIOD:           JANUARY 1976-DECEMBER 1986
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8665530 CHARLESTON


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

     HIGHEST OBSERVED WATER LEVEL (03/26/1983)         =   5.94
     MEAN HIGHER HIGH WATER                     MHHW   =   2.48
     MEAN HIGH WATER                            MHW    =   2.38
     MEAN TIDE LEVEL                            MTL    =   1.27
     MEAN LOW WATER                             MLW    =   0.16
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (03/17/1981)         =  -2.16

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     BUCKS NO 7 1975                            13.80     11.42
     BUCKS NO 6 1975                            12.81     10.43
     1139 A 1982                                 7.25      4.87
     1139 C 1982                                14.84     12.46


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

                                                   PUBLICATION DATE:  01/20/1988
Station ID: 8661139                                SUPERCEDED DATE:   04/21/2003
Name:       BUCKSPORT, WACCAMAW RIVER                         
            SOUTH CAROLINA
NOAA Chart: 11535                                  Latitude:         33° 38.8' N
USGS Quad:  BUCKSVILLE                             Longitude:        79°  5.7' W


                             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 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.

Return to Top
Products available at 8661139 BUCKSPORT, WACCAMAW RIVER, SC