Bench Mark Sheet for 8665637, THE COVE, FT MOULTRIE, CHARLESTON HARBOR 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8665637                         PUBLICATION DATE:  07/14/2003
Name:       THE COVE, CHARLESTON HARBOR                       
            SC
NOAA Chart: 11523                           Latitude:   32° 45.8' N (  32.76330)
USGS Quad:  FORT MOULTRIE                   Longitude:  79° 51.4' W ( -79.85670)


To reach the tidal bench marks from the east end of Ben Sawyer Bridge in
Sullivans Island, proceed east on State Highway 703 for 1.1 km (0.7 mi) to
County Road S-10-599, turn right onto County Road S-10-599 and go 2.1 km (1.3
mi) to Fort Moultrie Visitors Center. The bench marks are near the parking area
and the shore. The tide gage and staff were located on the visitors pier.


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


                 PRIMARY BENCH MARK STAMPING:  5637 C 1977
                         DESIGNATION:          866 5637 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4212
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CJ0598
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID#: CJ0598
LATITUDE:   32° 45.7' N (  32.76170)          LONGITUDE:  79° 51.4' W ( -79.85670)


The primary bench mark is a disk located at the north end of an I-shaped median
in the visitors parking area, 49.53 m (162.4 ft) west of bench mark 5637 F 1982,
10.94 m (35.9 ft) east of the east corner of a metal storm grate set into the
asphalt, 5.00 m (16.4 ft) NNE of a 0.30 (1.0 ft) crepe myrtle tree, 0.64 m (2.1
ft) east of the NE corner of the concrete base of a metal security light post,
and 0.49 m (1.6 ft) west of the west edge of a concrete sidewalk on the east
side of the median.  The bench mark is set level with the ground, crimped to the
top of a galvanized steel rod driven 4.9 m (16 ft) to refusal, and encased in a
4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  FMNM AP 1 TRACT 2 1971
                         DESIGNATION:           AP 1

MONUMENTATION:           Survey disk                           VM#:         4210
AGENCY:                  US Department of Interior (USDI)      IDB PID#:  CJ0600
SETTING CLASSIFICATION:  Shallow-set pipe                      OPUS PID:        
LATITUDE:   32° 45.7' N (  32.76170)          LONGITUDE:  79° 51.4' W ( -79.85670)


The bench mark is a disk brazed to a 1 m (3 ft) long, 2.5-inch pipe, located on
the NE boundary line of the visitors center, 50 m (164 ft) ESE of the centerline
of the concrete walkway leading to the visitors pier, 41.97 m (137.7 ft) north
of the NW corner of a small brick telephone substation building, 8.96 m (29.4
ft) WNW of the approximate center of a private wooden dock, and 1.83 m (6.0 ft)
NNE of a  0.3 m (1.0 ft) diameter pine tree.  The bench mark is set level with
the ground, brazed to a 1 m (3 ft) long 2.5-inch pipe, and encased in another
pipe.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8665637                         PUBLICATION DATE:  07/14/2003
Name:       THE COVE, CHARLESTON HARBOR                       
            SC
NOAA Chart: 11523                           Latitude:   32° 45.8' N (  32.76330)
USGS Quad:  FORT MOULTRIE                   Longitude:  79° 51.4' W ( -79.85670)


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


                         BENCH MARK STAMPING:  FMNM AP 4 TRACT 2 1971
                         DESIGNATION:          AP 4

MONUMENTATION:           Survey disk                           VM#:         4211
AGENCY:                  US Department of Interior (USDI)      IDB PID#:  CJ0601
SETTING CLASSIFICATION:  Shallow-set pipe                      OPUS PID:        
LATITUDE:   32° 45.8' N (  32.76330)          LONGITUDE:  79° 51.4' W ( -79.85670)


The bench mark is a disk brazed to a 1 m (3 ft) long 2.5-inch pipe, located on
the NE boundary line of the visitors center, 25.79 m (84.6 ft) WNW of the
centerline of the concrete walkway leading to the visitors pier, 24.02 m (78.8
ft) west of the SW corner of the visitors pier, 14.84 m (48.7 ft) NNW of the NW
corner of the granite tombstone of Major General William Moultrie, 3.84 m (12.6
ft) south of the NW corner of a rock sea wall, and 1 m (2 ft) east of the west
edge of the marsh.  The bench mark is set level with the ground, brazed to a 1 m
(3 ft) long 2.5-inch pipe, and encased in another pipe.



                         BENCH MARK STAMPING:  5637 E 1977
                         DESIGNATION:          866 5637 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4213
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   32° 45.8' N (  32.76330)          LONGITUDE:  79° 51.4' W ( -79.85670)


The bench mark is a disk located 29 m (95 ft) west of the exit lane of the
visitors parking area, 6.83 m (22.4 ft) WNW of the edge of the sidewalk, 3.72 m
(12.2 ft) south of a 1 m (3 ft) high concrete post, 3.66 m (12.0 ft) east of a
0.61 m (2.0 ft) diameter palmetto tree, and 2.38 m (7.8 ft) east of a chain link
fence on the west side of the park.  The bench mark is set 6 cm (0.2 ft) above
the ground, crimped to the top of a galvanized steel rod driven 4.9 m (16 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  3 of  5

                                                                                
Station ID: 8665637                         PUBLICATION DATE:  07/14/2003
Name:       THE COVE, CHARLESTON HARBOR                       
            SC
NOAA Chart: 11523                           Latitude:   32° 45.8' N (  32.76330)
USGS Quad:  FORT MOULTRIE                   Longitude:  79° 51.4' W ( -79.85670)


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


                         BENCH MARK STAMPING:  5637 F 1982
                         DESIGNATION:          866 5637 F TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4214
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  CJ0599
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   32° 45.7' N (  32.76170)          LONGITUDE:  79° 51.4' W ( -79.85670)


The bench mark is a disk located at a chain link fence corner near an extension
road leading east from the parking area, 24.38 m (80.0 ft) NE of the NE corner
of the parking area, 8.72 m (28.6 ft) WNW of the NW corner of the two-story
brick house at 1219 Cove Avenue, 5.94 m (19.5 ft) SSW of the centerline of the
extension road, and 2.29 m (7.5 ft) WSW of the NW corner of a chain link fence
around the two-story brick house.  The bench mark is set level with the ground,
crimped to the top of a stainless steel rod driven 11.0 m (36 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: 8665637                         PUBLICATION DATE:  07/14/2003
Name:       THE COVE, CHARLESTON HARBOR                       
            SC
NOAA Chart: 11523                           Latitude:   32° 45.8' N (  32.76330)
USGS Quad:  FORT MOULTRIE                   Longitude:  79° 51.4' W ( -79.85670)


                            T I D A L   D A T U M S 


Tidal datums at THE COVE, CHARLESTON HARBOR based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           April 1977 - July 1977
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8665530 CHARLESTON, COOPER RIVER ENTRANCE


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

     MEAN HIGHER HIGH WATER                     MHHW   =  1.714
     MEAN HIGH WATER                            MHW    =  1.603
     North American Vertical Datum              NAVD88 =  0.950
     MEAN SEA LEVEL                             MSL    =  0.856
     MEAN TIDE LEVEL                            MTL    =  0.829
     MEAN LOW WATER                             MLW    =  0.056
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     5637 C 1977                                 2.805    1.202
     FMNM AP 1 TRACT 2 1971                      3.247    1.644
     FMNM AP 4 TRACT 2 1971                      2.439    0.836
     5637 E 1977                                 2.784    1.181
     5637 F 1982                                 2.439    0.836


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

                                                                                
Station ID: 8665637                         PUBLICATION DATE:  07/14/2003
Name:       THE COVE, CHARLESTON HARBOR                       
            SC
NOAA Chart: 11523                           Latitude:   32° 45.8' N (  32.76330)
USGS Quad:  FORT MOULTRIE                   Longitude:  79° 51.4' W ( -79.85670)


                             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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