NOAA Web Site Link Tides and Currents Home Page Transparent placeholder image

Bench Mark Sheet for 8728408, DOG ISLAND, EAST END FL

Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8728408                         PUBLICATION DATE:  05/12/2004
Name:       DOG ISLAND, EAST END                              
            FL
NOAA Chart: 11404                           Latitude:   29° 48.6' N (  29.81000)
USGS Quad:  DOG ISLAND                      Longitude:  84° 35.1' W ( -84.58500)


To reach the tidal bench marks from Carrabelle, take the Ferry SPIC A to Dog
Island.  The bench marks are along the road leading south to the beach from the
ferry dock.  The gage and staff were located at the ferry dock on Dog Island.


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


                 PRIMARY BENCH MARK STAMPING:  8408 A 1978
                         DESIGNATION:          872 8408 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9818
AGENCY:                  Florida Department of Natural Resources
                         (FLDNR)                               IDB PID#:  AS0599
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   29° 48.6' N (  29.81000)          LONGITUDE:  84° 35.1' W ( -84.58500)


The primary bench mark is a disk located at the south end of the ferry loading
ramp, 105.7 m (346.9 ft) NNE of bench mark 8408 B 1978, 8.99 m (29.5 ft) SSE of
the apparent shoreline and 0.94 m (3.1 ft) SSE of a metal witness post. The
bench mark is crimped to the top of a copper-clad steel rod driven 12.0 m (39.5
ft) 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  2 of  5

                                                                                
Station ID: 8728408                         PUBLICATION DATE:  05/12/2004
Name:       DOG ISLAND, EAST END                              
            FL
NOAA Chart: 11404                           Latitude:   29° 48.6' N (  29.81000)
USGS Quad:  DOG ISLAND                      Longitude:  84° 35.1' W ( -84.58500)


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


                         BENCH MARK STAMPING:  8408 B 1978
                         DESIGNATION:          872 8408 B TIDAL

MONUMENTATION:           Bench Mark disk                       VM#:         9819
AGENCY:                  Florida Department of Natural Resources
                         (FLDNR)                               IDB PID#:  AS0598
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   29° 48.5' N (  29.80830)          LONGITUDE:  84° 35.0' W ( -84.58330)


The bench mark is a disk set in the top of a concrete monument, 105.7 m (346.9
ft) SSE of bench mark 8408 A 1978, 29.35 m (96.3 ft) north of a 0.46 m (1.5 ft)
diameter pine tree, 4.42 m (14.5 ft) ENE of the centerline of the gravel road
leading to the ferry landing, 0.43 m (1.4 ft) SW of a metal witness post, and
0.21 m (0.7 ft) below ground level.  NOTE:  Bench mark not found in 1998 by US
Power Squadron.



                         BENCH MARK STAMPING:  8408 C 1978
                         DESIGNATION:          872 8408 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9820
AGENCY:                  Florida Department of Natural Resources
                         (FLDNR)                               IDB PID#:  AS0597
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   29° 48.5' N (  29.80830)          LONGITUDE:  84° 35.1' W ( -84.58500)


The bench mark is a disk located south from the ferry dock, 69.01 m (226.4 ft)
south of bench mark 8408 B 1978, 11.58 m (38.0 ft) SE of the centerline of the
dirt road entrance to the Dog Island Air Strip, 5.00 m (16.4 ft) NNE of a 0.37 m
(1.2 ft) diameter pine tree, and 0.64 m (2.1 ft) NE of a witness post.  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 PVC pipe and concrete kickblock.

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

                                                                                
Station ID: 8728408                         PUBLICATION DATE:  05/12/2004
Name:       DOG ISLAND, EAST END                              
            FL
NOAA Chart: 11404                           Latitude:   29° 48.6' N (  29.81000)
USGS Quad:  DOG ISLAND                      Longitude:  84° 35.1' W ( -84.58500)


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


                         BENCH MARK STAMPING:  8408 D 1978 CLB
                         DESIGNATION:          872 8408 D TIDAL

MONUMENTATION:           Bench Mark disk                       VM#:         9821
AGENCY:                  Florida Department of Natural Resources
                         (FLDNR)                               IDB PID#:  AS0596
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   29° 48.4' N (  29.80670)          LONGITUDE:  84° 35.0' W ( -84.58330)


The bench mark is a disk set in the top of a concrete monument, 125 m (410 ft)
SSE of bench mark 8408 C 1978, 11.70 m (38.4 ft) ENE of the centerline of a dirt
road angling westerly along the island, 4.69 m (15.4 ft) WSW of the centerline
of the road leading to the ferry landing and 1.71 m (5.6 ft) ESE of a Wilderness
Preserve sign post, 0.52 m (1.7 ft) ENE of a witness post, and 0.06 m (0.2 ft)
below ground level.



                         BENCH MARK STAMPING:  8408 E 1978
                         DESIGNATION:          872 8408 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9822
AGENCY:                  Florida Department of Natural Resources
                         (FLDNR)                               IDB PID#:  AS0600
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   29° 48.4' N (  29.80670)          LONGITUDE:  84° 35.0' W ( -84.58330)


The bench mark is a disk located south from the southerly end of the ferry dock,
59.95 m (196.7 ft) SE of bench mark 8408 D 1978 CLB, 12.98 m (42.6 ft) east of
the centerline of the dirt road leading to the ferry landing, 9.08 m (29.8 ft)
south of the centerline of the dirt road leading easterly along the island, 1.98
m (6.5 ft) north of utility pole # 58X2340R, and 2.07 m (6.8 ft) NE of a witness
post.  The bench mark is set 0.15 m (0.5 ft) below ground level, crimped to the
top of a copper-clad steel rod driven 7.3 m (24 ft) 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

                                                                                
Station ID: 8728408                         PUBLICATION DATE:  05/12/2004
Name:       DOG ISLAND, EAST END                              
            FL
NOAA Chart: 11404                           Latitude:   29° 48.6' N (  29.81000)
USGS Quad:  DOG ISLAND                      Longitude:  84° 35.1' W ( -84.58500)


                            T I D A L   D A T U M S 


Tidal datums at DOG ISLAND, EAST END based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           March 1979 - March 1979
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8728360 TURKEY POINT


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.746
     MEAN HIGH WATER                            MHW    =  0.690
     North American Vertical Datum              NAVD88 =  0.476
     MEAN TIDE LEVEL                            MTL    =  0.430
     MEAN SEA LEVEL                             MSL    =  0.419
     MEAN LOW WATER                             MLW    =  0.170
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     8408 A 1978                                 2.336    1.646
     8408 B 1978                                 1.726    1.036
     8408 C 1978                                 2.514    1.824
     8408 D 1978 CLB                             2.688    1.998
     8408 E 1978                                 3.100    2.410


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

                                                                                
Station ID: 8728408                         PUBLICATION DATE:  05/12/2004
Name:       DOG ISLAND, EAST END                              
            FL
NOAA Chart: 11404                           Latitude:   29° 48.6' N (  29.81000)
USGS Quad:  DOG ISLAND                      Longitude:  84° 35.1' W ( -84.58500)


                             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.

Return to Top
Products available at 8728408 DOG ISLAND, EAST END, FL

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services