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Bench Mark Sheet for 8672667, Range A Light, Bear River GA

Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8672667                         PUBLICATION DATE:  07/12/2012
Name:       RANGE A LIGHT, ICWW, BEAR R.                      
            GA
NOAA Chart: 11511                           Latitude:   31° 47.6' N (  31.79330)
USGS Quad:  OAK LEVEL                       Longitude:  81° 10.9' W ( -81.18170)


To reach the tidal bench marks proceed by boat, on Bear River (Intracoastal
Waterway) to the supporting structure of Range Front Light A (FL R 4 sec), north
of St. Catherine Sound.  The bench marks are located on a strip of marsh
adjacent ot the light structure, bordered on the west by Kilkenny Creek and on
the east by the Intracoastal Waterway.  The tide gage and staff were mounted on
the light structure, offshore of the marsh.


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


                 PRIMARY BENCH MARK STAMPING:  2667 A 1977
                         DESIGNATION:          867 2667 A 1977

MONUMENTATION:           Survey disk                           VM#:         4740
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID#: BBCR75
LATITUDE:   31° 47.6' N (  31.79353)          LONGITUDE:  81° 11.0' W ( -81.18267)


The bench mark is a disk located on a strip of marsh, adjacent to Range Front
Light A (FL R 4 sec) between Kilkenny Creek and Bear River (ICWW), 1.22 m (4.0
ft) SW of a witness post, and bears west of the light structure.  The mark is
set atop an unspecified deep rod driven 9.75 m (32.0 ft) to refusal, 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: 8672667                         PUBLICATION DATE:  07/12/2012
Name:       RANGE A LIGHT, ICWW, BEAR R.                      
            GA
NOAA Chart: 11511                           Latitude:   31° 47.6' N (  31.79330)
USGS Quad:  OAK LEVEL                       Longitude:  81° 10.9' W ( -81.18170)


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


                         BENCH MARK STAMPING:  2667 B 1977
                         DESIGNATION:          867 2667 B 1977

MONUMENTATION:           Survey disk                           VM#:         4741
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   31° 47.6' N (  31.79322)          LONGITUDE:  81° 11.0' W ( -81.18300)


The bench mark is a disk located on a strip of marsh adjacent to Range Front
Light A between Kilkenny Creek and Bear River (ICWW), 35.45 m (116.3 ft) south
of Bench Mark 2667 A 1977, and bears west of the light structure.  The mark is
set atop an unspecified deep rod driven 12.19 m (40.0 ft) to refusal, encased in
a 4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  2267 C 1977
                         DESIGNATION:          867 2667 C 1977

MONUMENTATION:           Survey disk                           VM#:         4742
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   31° 47.6' N (  31.79297)          LONGITUDE:  81° 10.9' W ( -81.18131)


The bench mark is a disk located on a strip of marsh adjacent to Range Front
Light A between Kilkenny Creek and Bear River (ICWW), 31.70 m (104.0 ft) south
of Bench Mark 2667 B 1977, and bears west of the light structure.  The mark is
set atop an unspecified deep rod driven 14.63 m (48.0 ft) to refusal, 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: 8672667                         PUBLICATION DATE:  07/12/2012
Name:       RANGE A LIGHT, ICWW, BEAR R.                      
            GA
NOAA Chart: 11511                           Latitude:   31° 47.6' N (  31.79330)
USGS Quad:  OAK LEVEL                       Longitude:  81° 10.9' W ( -81.18170)


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


                         BENCH MARK STAMPING:  2667 D 1977
                         DESIGNATION:          867 2667 D 1977

MONUMENTATION:           Survey disk                           VM#:         4743
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   31° 47.6' N (  31.79283)          LONGITUDE:  81° 11.0' W ( -81.18325)


The bench mark is a disk located on a strip of marsh adjacent to Range Front
Light A between Kilkenny Creek and Bear River (ICWW), 37.34 m (122.5 ft) SW of
Bench Mark 2667 C 1977, and bears west of the light structure.  The mark is set
atop an unspecified deep rod driven 14.63 m (48.0 ft) to refusal, encased in a
4-inch PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  2667 E 1977
                         DESIGNATION:          867 2667 E 1977

MONUMENTATION:           Survey disk                           VM#:         4744
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   31° 47.6' N (  31.79275)          LONGITUDE:  81° 11.0' W ( -81.18369)


The bench mark is a disk located on a strup of marsh adjacent to Range Front
Light A between Kilkenny Creek and Bear River (ICWW), 36.58 m (120.0 ft) west of
Bench Mark 2667 D 1977, 1.83 m (6.0 ft) south of a witness post, and bears west
of the structure. The mark is set atop an unspecified deep rod driven 14.63 m
(48.0 ft) to refusal, encased in a 4-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: 8672667                         PUBLICATION DATE:  07/12/2012
Name:       RANGE A LIGHT, ICWW, BEAR R.                      
            GA
NOAA Chart: 11511                           Latitude:   31° 47.6' N (  31.79330)
USGS Quad:  OAK LEVEL                       Longitude:  81° 10.9' W ( -81.18170)


                            T I D A L   D A T U M S 


Tidal datums at RANGE A LIGHT, ICWW, BEAR R. based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           February 2012 - April 2012
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8670870 FORT PULASKI, SAVANNAH RIVER


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

     MEAN HIGHER HIGH WATER                     MHHW   =  2.421
     MEAN HIGH WATER                            MHW    =  2.308
     MEAN SEA LEVEL                             MSL    =  1.261
     MEAN TIDE LEVEL                            MTL    =  1.186
     MEAN LOW WATER                             MLW    =  0.064
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     2667 A 1977                                 3.171    0.863
     2667 B 1977                                 3.277    0.969
     2267 C 1977                                 3.250    0.942
     2667 D 1977                                 3.213    0.905
     2667 E 1977                                 3.244    0.936


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

                                                                                
Station ID: 8672667                         PUBLICATION DATE:  07/12/2012
Name:       RANGE A LIGHT, ICWW, BEAR R.                      
            GA
NOAA Chart: 11511                           Latitude:   31° 47.6' N (  31.79330)
USGS Quad:  OAK LEVEL                       Longitude:  81° 10.9' W ( -81.18170)


                             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 8672667 Range A Light, Bear River, GA

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