Superseded Bench Mark Sheet for 8668498, Fripps Inlet SC

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  12/02/1985
Station ID: 8668498                                SUPERCEDED DATE:   04/21/2003
Name:       HUNTING ISLAND BRIDGE, FRIPPS INLET               
            SOUTH CAROLINA
NOAA Chart: 11513                                  Latitude:         32° 20.4' N
USGS Quad:  FRIPPS INLET                           Longitude:        80° 27.9' W


To reach the tidal bench marks from the west side of the Richard V. Wood
Memorial Bridge in Beaufort, proceed south 16.4 miles (26.4 km) on State Highway
21 until the road divides to go into Hunting Island Campgrounds, bear right onto
County Road S-7-406 and continue 2.9 miles (4.7 km) to the bridge over Fripps
Inlet.  The bench marks are located on the north end of the bridge and extend
along the road toward the boat landing.  The tide gage and staff were located
midway on the east side of the bridge near two groups of pilings.


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


                 PRIMARY BENCH MARK STAMPING:  KRELL 1963

MONUMENTATION:           Survey Disk                               VM#:     4496
AGENCY:                                                            PID#:  CK2355
SETTING CLASSIFICATION:  Retaining Wall


The bench mark is set flush in concrete at the NE end of the bridge, 28.8 feet
(8.8 m) SE of Bench Mark Krell No 2 1963, 28.0 feet (8.5 m) NNE of Bench Mark
Krell No 1 1963, 14.0 feet (4.3 m) SE of the centerline of the bridge, 11.2 feet
(3.4 m) SSW of the NE corner of the bridge, and 3.0 feet (0.9 m) WNW of the
bridge railing.



                         BENCH MARK STAMPING:  KRELL NO 1 1963

MONUMENTATION:           Survey Disk                               VM#:     4497
AGENCY:                                                            PID#:  CK2356
SETTING CLASSIFICATION:  Retaining Wall


The bench mark is set flush in concrete at the NE end of the bridge, 47.7 feet
(14.5 m) SSE of Bench Mark Krell No 2 1963, 39.0 feet (11.9 m) south of the NE
corner of the bridge, 16.0 feet (4.9 m) ESE of the centerline of the bridge, and
1.0 foot (0.3 m) west of the east bridge railing.

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

                                                   PUBLICATION DATE:  12/02/1985
Station ID: 8668498                                SUPERCEDED DATE:   04/21/2003
Name:       HUNTING ISLAND BRIDGE, FRIPPS INLET               
            SOUTH CAROLINA
NOAA Chart: 11513                                  Latitude:         32° 20.4' N
USGS Quad:  FRIPPS INLET                           Longitude:        80° 27.9' W


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


                         BENCH MARK STAMPING:  KRELL NO 2 1963

MONUMENTATION:           Survey Disk                               VM#:     4498
AGENCY:                                                            PID#:  CK2357
SETTING CLASSIFICATION:  Retaining Wall


The bench mark is set flush in concrete at the NW end of the bridge, 47.7 feet
(14.5 m) NNW of Bench Mark Krell No 1 1963, 28.8 feet (8.8 m) NW of Bench Mark
Krell 1963, 17.7 feet (5.4 m) WNW of the centerline of the bridge, and 1.2 feet
(0.4 m) east of the NW corner of the bridge.



                         BENCH MARK STAMPING:  8498 D 1977

MONUMENTATION:           Survey Disk                               VM#:     4499
AGENCY:                                                            PID#:  CK2352
SETTING CLASSIFICATION:  Galvanized Steel Rod


The bench mark is in a grassy area NW of the bridge, 221.8 feet (67.6 m) ENE of
Bench Mark 8498 F 1977, 50.0 feet (15.2 m) east of the centerline of County Road
S-7-406, 37.5 feet (11.4 m) SSE of the centerline of County Road S-7-439, 34.0
feet (10.4 m) NE of a 1.5-foot (0.5 m) diameter oak tree, and 12.9 feet (3.9 m)
north of utility pole #272301.  The bench mark is at ground level, crimped to a
galvanized steel rod driven 15 feet (5 m) to refusal, and encased in a PVC pipe
and concrete kickblock.

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

                                                   PUBLICATION DATE:  12/02/1985
Station ID: 8668498                                SUPERCEDED DATE:   04/21/2003
Name:       HUNTING ISLAND BRIDGE, FRIPPS INLET               
            SOUTH CAROLINA
NOAA Chart: 11513                                  Latitude:         32° 20.4' N
USGS Quad:  FRIPPS INLET                           Longitude:        80° 27.9' W


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


                         BENCH MARK STAMPING:  8498 E 1977

MONUMENTATION:           Survey Disk                               VM#:     4500
AGENCY:                                                            PID#:  CK2354
SETTING CLASSIFICATION:  Galvanized Steel Rod


The bench mark is on the SW side of County Road S-7-439 leading to a boat ramp,
250.8 feet (76.4 m) west of Bench Mark 8498 F 1977, 46.0 feet (14.0 m) NE of the
berm line, 17.4 feet (5.3 m) SSW of the centerline of County Road S-7-439, 18.4
feet (5.6 m) NE of a lone 1.0-foot (0.3 m) diameter pine tree, 14.0 feet (4.3 m)
east of a 1.0-foot (0.3 m) diameter oak tree, and 5.9 feet (1.8 m) east of a
witness post.  The bench mark is at ground level, crimped to a galvanized steel
rod driven 15 feet (5 m) to refusal, and encased in a PVC pipe and concrete
kickblock.



                         BENCH MARK STAMPING:  8498 F 1977

MONUMENTATION:           Survey Disk                               VM#:     4501
AGENCY:                                                            PID#:  CK2353
SETTING CLASSIFICATION:  Galvanized Steel Rod


The bench mark is on the NE side of County Road S-7-439 leading to a boat ramp,
171.8 feet (52.4 m) WNW of the centerline of County Road S-7-406, 40.5 feet
(12.3 m) NNE of the berm line, 17.3 feet (5.3 m) NNE of the centerline of County
Road S-7-439, and 12.1 feet (3.7 m) WSW of a 1.3-foot (0.4 m) diameter palmetto
tree with a witness sign attached.  The bench mark is at ground level, crimped
to a galvanized steel rod driven 15 feet (5 m) to refusal, and encased in a PVC
pipe and concrete kickblock.

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

                                                   PUBLICATION DATE:  12/02/1985
Station ID: 8668498                                SUPERCEDED DATE:   04/21/2003
Name:       HUNTING ISLAND BRIDGE, FRIPPS INLET               
            SOUTH CAROLINA
NOAA Chart: 11513                                  Latitude:         32° 20.4' N
USGS Quad:  FRIPPS INLET                           Longitude:        80° 27.9' W


                            T I D A L   D A T U M S 


Tidal datums at HUNTING ISLAND BRIDGE, FRIPPS INLET based on:

     LENGTH OF SERIES:      10 MONTHS
     TIME PERIOD:           FEBRUARY 1978-JANUARY 1979
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8667630 EDISTO BEACH


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

     HIGHEST OBSERVED WATER LEVEL (07/19/1978)         =   8.87
     MEAN HIGHER HIGH WATER                     MHHW   =   6.69
     MEAN HIGH WATER                            MHW    =   6.32
     MEAN TIDE LEVEL                            MTL    =   3.27
     MEAN LOW WATER                             MLW    =   0.21
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (01/29/1979)         =  -2.97

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     KRELL 1963                                 19.36     13.04
     KRELL NO 1 1963                            19.66     13.34
     KRELL NO 2 1963                            19.28     12.96
     8498 D 1977                                10.90      4.58
     8498 E 1977                                 9.11      2.79
     8498 F 1977                                10.49      4.17


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

                                                   PUBLICATION DATE:  12/02/1985
Station ID: 8668498                                SUPERCEDED DATE:   04/21/2003
Name:       HUNTING ISLAND BRIDGE, FRIPPS INLET               
            SOUTH CAROLINA
NOAA Chart: 11513                                  Latitude:         32° 20.4' N
USGS Quad:  FRIPPS INLET                           Longitude:        80° 27.9' 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.

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