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Bench Mark Sheet for 8679758, DUNGENESS, SEACAMP DOCK 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 8679758                         PUBLICATION DATE:  05/09/2011
Name:       DUNGENESS, SEACAMP DOCK                           
            GA
NOAA Chart: 11503                           Latitude:   30° 45.8' N (  30.76330)
USGS Quad:  CUMBERLAND ISLAND SOUTH         Longitude:  81° 28.3' W ( -81.47170)


To reach the tidal bench marks from Greyfield on North-South Road on Cumberland
Island South proceed 1.6 km (1 mi) south to hard improved road, then west on
improved road to the Cumberland Island National Seashore Park ranger station. 
The bench marks are located in the vicinity of the park ranger station.  The
tide gage and staff were located on the seacamp dock SW of the ranger station.


                         T I D A L   B E N C H   M A R K S
                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8679758                         PUBLICATION DATE:  05/09/2011
Name:       DUNGENESS, SEACAMP DOCK                           
            GA
NOAA Chart: 11503                           Latitude:   30° 45.8' N (  30.76330)
USGS Quad:  CUMBERLAND ISLAND SOUTH         Longitude:  81° 28.3' W ( -81.47170)


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


                 PRIMARY BENCH MARK STAMPING:  NIGHTINGALE 2 1933
                         DESIGNATION:          NIGHTINGALE 2

MONUMENTATION:           Triangulation Station disk            VM#:         4949
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BC1815
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   30° 45.9' N (  30.76500)          LONGITUDE:  81° 28.2' W ( -81.47000)


The primary bench mark is a disk set in the top of a 1-foot square concrete
monument, 12 m (41 ft) west of a chimney on the west side of the ranger station
at Cumberland Island, 6 m (20 ft) east of a wooden bulkhead, and 3 m (9 ft) NW
from a large oak tree along the bank.



                         BENCH MARK STAMPING:  9758 B 1978
                         DESIGNATION:          867 9758 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4950
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   30° 45.8' N (  30.76330)          LONGITUDE:  81° 28.3' W ( -81.47170)


The bench mark is a disk located at the NW corner of the ranger offices, 31 m
(103 ft) SE of bench mark 9758 C 1978, 16.15 m (53.0 ft) ENE from bench mark
Nightengale 2 1933, and 0.61 m (2.0 ft) NW of a wooden power pole (antenna
mast). The bench mark is set flush with ground, crimped the to the top of a rod
driven 1.2 m (4 ft).

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8679758                         PUBLICATION DATE:  05/09/2011
Name:       DUNGENESS, SEACAMP DOCK                           
            GA
NOAA Chart: 11503                           Latitude:   30° 45.8' N (  30.76330)
USGS Quad:  CUMBERLAND ISLAND SOUTH         Longitude:  81° 28.3' W ( -81.47170)


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


                         BENCH MARK STAMPING:  9758 C 1978
                         DESIGNATION:          867 9758 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4951
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   30° 45.8' N (  30.76330)          LONGITUDE:  81° 28.3' W ( -81.47170)


The bench mark is a disk located behind the ranger offices at Cumberland Island
in the NW corner of the yard area, 29.50 m (96.8 ft) west from bench mark 9758 D
1978, and 1 m (3 ft) east of a line of bush palms along the bank.  The bench
mark is set flush with the ground, and crimped to the top of a rod driven 1.2 m
(4 ft).



                         BENCH MARK STAMPING:  9758 D 1978
                         DESIGNATION:          867 9758 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4952
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   30° 45.8' N (  30.76330)          LONGITUDE:  81° 28.3' W ( -81.47170)


The bench mark is a disk set betwen two large live oak trees behind the ranger
offices at Cumberland Island, 29.50 m (96.8 ft) west of bench mark 9758 E 1978,
and 28 m (92 ft) north of northernmost side of ranger building at the air
conditioning unit heat pump.  The bench mark is set flush with the ground, and
crimped the top of a rod driven 1.2 m (4 ft).

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8679758                         PUBLICATION DATE:  05/09/2011
Name:       DUNGENESS, SEACAMP DOCK                           
            GA
NOAA Chart: 11503                           Latitude:   30° 45.8' N (  30.76330)
USGS Quad:  CUMBERLAND ISLAND SOUTH         Longitude:  81° 28.3' W ( -81.47170)


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


                         BENCH MARK STAMPING:  9758 E 1978
                         DESIGNATION:          867 9758 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         4953
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Unspecified deep rod                  OPUS PID:        
LATITUDE:   30° 45.8' N (  30.76330)          LONGITUDE:  81° 28.3' W ( -81.47170)


The bench mark is a disk located behind the ranger offices at Cumberland Island,
12 m (38 ft) NE of a small aluminum storage shelter, and 7 m (22 ft) NE of the
centerline of a small driveway leading to the rear of the building.  The bench
mark is set flush with the ground, and crimped to the top of a rod driven 1.2 m
(4 ft).

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8679758                         PUBLICATION DATE:  05/09/2011
Name:       DUNGENESS, SEACAMP DOCK                           
            GA
NOAA Chart: 11503                           Latitude:   30° 45.8' N (  30.76330)
USGS Quad:  CUMBERLAND ISLAND SOUTH         Longitude:  81° 28.3' W ( -81.47170)


                            T I D A L   D A T U M S 


Tidal datums at DUNGENESS, SEACAMP DOCK based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           January 1979 - December 1979
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8720030 FERNANDINA BEACH, AMELIA RIVER


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

     HIGHEST OBSERVED WATER LEVEL (09/04/1979)         =  2.694
     MEAN HIGHER HIGH WATER                     MHHW   =  2.067
     MEAN HIGH WATER                            MHW    =  1.959
     MEAN SEA LEVEL                             MSL    =  1.044
     MEAN TIDE LEVEL                            MTL    =  1.010
     MEAN LOW WATER                             MLW    =  0.060
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (02/26/1979)         = -0.826

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NIGHTINGALE 2 1933                          4.681    2.722
     9758 B 1978                                 4.826    2.867
     9758 C 1978                                 4.548    2.589
     9758 D 1978                                 4.768    2.809
     9758 E 1978                                 5.028    3.069


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  6

                                                                                
Station ID: 8679758                         PUBLICATION DATE:  05/09/2011
Name:       DUNGENESS, SEACAMP DOCK                           
            GA
NOAA Chart: 11503                           Latitude:   30° 45.8' N (  30.76330)
USGS Quad:  CUMBERLAND ISLAND SOUTH         Longitude:  81° 28.3' W ( -81.47170)


                             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 8679758 DUNGENESS, SEACAMP DOCK, GA

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services