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Bench Mark Sheet for 8662796, MINIM 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8662796                         PUBLICATION DATE:  03/09/2004
Name:       MINIM CREEK                                       
            SC
NOAA Chart: 11532                           Latitude:   33° 11.7' N (  33.19500)
USGS Quad:  MINIM ISLAND                    Longitude:  79° 16.5' W ( -79.27500)


To reach the tidal bench marks from the U.S. Highway 17 bridge over the Santee
River, proceed north on U.S. Highway 17 for 1.3 km (0.8 mi) to a road on the
east side (North Santee River Road), then turn right and proceed east for 10.4
km (6.5 mi) to the Intracoastal Waterway, then proceed by boat south for 3.2 km
(2.0 mi) along the waterway to Minim Creek, then west for 0.2 km (0.1 mi) along
Minim Creek to a small Corps of Engineers constructed dock.  The bench marks are
along the dirt road and dike to the east of the dock.  The tide gage and staff
were on the dock.


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


                 PRIMARY BENCH MARK STAMPING:  M.C. NO 1 1975
                         DESIGNATION:          866 2796 TIDAL MC 1

MONUMENTATION:           Tidal Station disk                    VM#:         3954
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2002
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   33° 11.7' N (  33.19500)          LONGITUDE:  79° 16.5' W ( -79.27500)


The primary bench mark is a disk located at the base of the dock, 183 m (600 ft)
west of the Intracoastal Waterway, 2.74 m (9.0 ft) south of the centerline of
the dirt road, 0.91 m (3.0 ft) SW of the 4 inch square corner post of the dock,
0.37 m (1.2 ft) east of a steel witness post, and 0.24 m (0.8 ft) north of a
second witness post.  The bench mark is set 12 cm (0.4 ft) below road level,
crimped to the top of a copper-clad steel rod driven 9.8 m (32 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: 8662796                         PUBLICATION DATE:  03/09/2004
Name:       MINIM CREEK                                       
            SC
NOAA Chart: 11532                           Latitude:   33° 11.7' N (  33.19500)
USGS Quad:  MINIM ISLAND                    Longitude:  79° 16.5' W ( -79.27500)


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


                         BENCH MARK STAMPING:  M.C. NO 5 1975
                         DESIGNATION:          866 2796 TIDAL MC 5

MONUMENTATION:           Tidal Station disk                    VM#:         3955
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2005
SETTING CLASSIFICATION:  Concrete footing for tower            OPUS PID:        
LATITUDE:   33° 11.7' N (  33.19500)          LONGITUDE:  79° 16.4' W ( -79.27330)


The bench mark is a disk set in the SW 1.07 m (3.5 ft) diameter concrete footing
of a 11 m (35 ft) high tower near the junction of Minim Creek and the
Intracoastal Waterway, 45.05 m (147.8 ft) SSE of bench mark 2796 B 1982, 0.37 m
(1.2 ft) SW of the corner support beam, and 0.21 m (0.7 ft) north of the edge of
the footing.



                         BENCH MARK STAMPING:  M.C. NO 6 1975
                         DESIGNATION:          866 2796 TIDAL MC 6

MONUMENTATION:           Tidal Station disk                    VM#:         3956
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2006
SETTING CLASSIFICATION:  Concrete footing for tower            OPUS PID:        
LATITUDE:   33° 11.7' N (  33.19500)          LONGITUDE:  79° 16.4' W ( -79.27330)


The bench mark is a disk set in the NE 1.07 m (3.5 ft) diameter concrete footing
of the 11 m (35 ft) high tower, 5.58 m (18.3 ft) east of bench mark M.C. NO 5
1975, 0.34 m (1.1 ft) NNE of the corner support beam, and 0.18 m (0.6 ft) north
of the edge of the footing.

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

                                                                                
Station ID: 8662796                         PUBLICATION DATE:  03/09/2004
Name:       MINIM CREEK                                       
            SC
NOAA Chart: 11532                           Latitude:   33° 11.7' N (  33.19500)
USGS Quad:  MINIM ISLAND                    Longitude:  79° 16.5' W ( -79.27500)


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


                         BENCH MARK STAMPING:  2796 A 1982
                         DESIGNATION:          866 2796 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3957
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2003
SETTING CLASSIFICATION:  Copper clad steel rod                 OPUS PID:        
LATITUDE:   33° 11.7' N (  33.19500)          LONGITUDE:  79° 16.4' W ( -79.27330)


The bench mark is a disk located on the NE edge of a turnout along the dirt
road, 96 m (316 ft) ESE of bench mark M.C. NO 1 1975, and 3.35 m (11.0 ft) SSE
of the centerline of the dirt road.  The bench mark is crimped to the top of a
copper-clad steel rod driven 9.8 m (32 ft) to refusal, and encased in a 5-inch
PVC pipe and concrete kickblock.  NOTE:  The disk for bench mark M.C. NO 3 1975
was found sheared off.  Disk 3796 A 1982 was crimped to the rod to replace M.C.
NO 3 1975.  Mark not found in 1992 by National Geodetic Survey (NGS).



                         BENCH MARK STAMPING:  2796 B 1982
                         DESIGNATION:          866 2796 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         3958
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DD2004
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   33° 11.7' N (  33.19500)          LONGITUDE:  79° 16.4' W ( -79.27330)


The bench mark is a disk located along the east side of the dirt road, 16.58 m
(54.4 ft) NE of bench mark 2796 A 1982, 5.79 m (19.0 ft) SSE of the centerline
of the dirt road, and 0.91 m (3.0 ft) WNW of a metal witness post with sign. 
The bench mark is set 6 cm (0.2 ft) below grade, crimped to the top of a
stainless steel rod driven 9.8 m (32 ft) to refusal, and encased in a 5-inch PVC
pipe and concrete kickblock.  NOTE: Mark not found in 1992 by National Geodetic
Survey (NGS).

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

                                                                                
Station ID: 8662796                         PUBLICATION DATE:  03/09/2004
Name:       MINIM CREEK                                       
            SC
NOAA Chart: 11532                           Latitude:   33° 11.7' N (  33.19500)
USGS Quad:  MINIM ISLAND                    Longitude:  79° 16.5' W ( -79.27500)


                            T I D A L   D A T U M S 


Tidal datums at MINIM CREEK based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           July 1975 - August 1975
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8662746 WINYAH BAY, SOUTH ISLAND PLANTATION


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

     MEAN HIGHER HIGH WATER                     MHHW   =  1.372
     MEAN HIGH WATER                            MHW    =  1.270
     North American Vertical Datum              NAVD88 =  0.682
     MEAN SEA LEVEL                             MSL    =  0.674
     MEAN TIDE LEVEL                            MTL    =  0.663
     MEAN LOW WATER                             MLW    =  0.055
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     M.C. NO 1 1975                              2.283    1.013
     M.C. NO 5 1975                              2.419    1.149
     M.C. NO 6 1975                              2.449    1.179
     2796 A 1982                                 2.405    1.135
     2796 B 1982                                 1.740    0.470


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

                                                                                
Station ID: 8662796                         PUBLICATION DATE:  03/09/2004
Name:       MINIM CREEK                                       
            SC
NOAA Chart: 11532                           Latitude:   33° 11.7' N (  33.19500)
USGS Quad:  MINIM ISLAND                    Longitude:  79° 16.5' W ( -79.27500)


                             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 8662796 MINIM CREEK, SC

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