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Bench Mark Sheet for 8720194, LITTLE TALBOT ISLAND 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8720194                                PUBLICATION DATE:  05/28/2004
Name:       LITTLE TALBOT ISLAND                              
            FLORIDA
NOAA Chart: 11490                                  Latitude:         30° 25.8' N
USGS Quad:  MAYPORT                                Longitude:        81° 24.3' W


To reach the tidal bench marks from the west landing of the Mayport Ferry at
Mayport, proceed north northeast on State Highway A1A for 8 km (5 mi) to the
entrance of Little Talbot Island State Park, then travel south in the park for
3.5 km (2.2 mi) to the South Recreation Area and fishing pier.  The bench marks
are in the South Recreation Area and along State Highway A1A.  The tide gage and
staff were located at the end of the pier.


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


                 PRIMARY BENCH MARK STAMPING:  A 326 1970
                         DESIGNATION:          A 326

MONUMENTATION:           Bench Mark disk                           VM#:     5069
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  BC0437
SETTING CLASSIFICATION:  Concrete monument


The primary bench mark is a disk set in the top of a concrete monument at the
old entrance (now closed) to the South Recreation Area, 28 m (92 ft) east of the
centerline of State Highway A1A, 9 m (29 ft) north of the centerline of the old
entrance road, 0.46 m (1.5 ft) south of a metal witness post, and 0.15 m (0.5
ft) above ground level.



                         BENCH MARK STAMPING:  B 326 1970
                         DESIGNATION:          B 326

MONUMENTATION:           Bench Mark disk                           VM#:     5070
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  BC0436
SETTING CLASSIFICATION:  Concrete monument


The bench mark is a disk set in the top of a concrete monument about 1.8 km (1.1
mi) north of bench mark A 326 1970 at the junction of State Highway A1A and a
sand road leading west, 35.51 m (116.5 ft) west of the centerline of State
Highway A1A, 21.79 m (71.5 ft) north of the centerline of the sand road, 10.35 m
(34.0 ft) NW of a lone 0.40 m (1.3 ft) diameter cabbage palm tree, 1 m (2 ft)
west of a metal witness post, and 0.3 m (1 ft) below the level of the highway.

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

                                                                                
Station ID: 8720194                                PUBLICATION DATE:  05/28/2004
Name:       LITTLE TALBOT ISLAND                              
            FLORIDA
NOAA Chart: 11490                                  Latitude:         30° 25.8' N
USGS Quad:  MAYPORT                                Longitude:        81° 24.3' W


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


                         BENCH MARK STAMPING:  NO 3 1974
                         DESIGNATION:          872 0194 TIDAL 3

MONUMENTATION:           Tidal Station disk                        VM#:     5071
AGENCY:                  National Ocean Survey (NOS)               PID#:  BC1558
SETTING CLASSIFICATION:  Culvert head wall


The bench mark is a disk set in the south end of a culvert head wall, 56 m (183
ft) south of the old entrance (now closed) to the South Recreation Area, and
6.92 m (22.7 ft) west of the centerline of State Highway A1A.



                         BENCH MARK STAMPING:  DUVAL R-22 1974
                         DESIGNATION:          R 22

MONUMENTATION:           Tidal Station disk                        VM#:     5072
AGENCY:                  Florida Department of Natural Resources (FLDNR)PID#:  BC1561
SETTING CLASSIFICATION:  Concrete monument


The bench mark is a disk set in the top of a concrete monument in the first sand
dune north of the parking lot west of the fishing pier, 17.68 m (58.0 ft) NW of
the NE corner of the parking lot, and 6 cm (0.2 ft) above the sand level.



                         BENCH MARK STAMPING:  NO 1 1974 RESET 1979
                         DESIGNATION:          872 0194 TIDAL 1 RESET

MONUMENTATION:           Tidal Station disk                        VM#:    16571
AGENCY:                  National Ocean Survey (NOS)               PID#:  BC2470
SETTING CLASSIFICATION:  Concrete base


The bench mark is a disk set in the concrete base for the SE corner support
column of the middle picnic pavilion at the south recreation area, 21.73 m (71.3
ft) east of the centerline of the northbound drive, and 1.46 m (4.8 ft) NW of a
wooden walkway to the beach.

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

                                                                                
Station ID: 8720194                                PUBLICATION DATE:  05/28/2004
Name:       LITTLE TALBOT ISLAND                              
            FLORIDA
NOAA Chart: 11490                                  Latitude:         30° 25.8' N
USGS Quad:  MAYPORT                                Longitude:        81° 24.3' W


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


                         BENCH MARK STAMPING:  NO 2 1974 RESET 1979
                         DESIGNATION:          872 0194 TIDAL 2 RESET

MONUMENTATION:           Tidal Station disk                        VM#:    16572
AGENCY:                  National Ocean Survey (NOS)               PID#:  BC2469
SETTING CLASSIFICATION:  Concrete post


The bench mark is a disk set in the top of a concrete post, 7.53 m (24.7 ft)
east of the centerlien of the northbound drive at the south recreation area,
8.02 m (26.3 ft) WNW of the NW corner of the southernmost picnic pavilion, 0.3 m
(1.0 ft) NW of a power pole, 0.3 m (1.0 ft) north of a metal witness post, and
flush with the ground.

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

                                                                                
Station ID: 8720194                                PUBLICATION DATE:  05/28/2004
Name:       LITTLE TALBOT ISLAND                              
            FLORIDA
NOAA Chart: 11490                                  Latitude:         30° 25.8' N
USGS Quad:  MAYPORT                                Longitude:        81° 24.3' W


                            T I D A L   D A T U M S 


Tidal datums at LITTLE TALBOT ISLAND based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           May 1974 - August 1974
     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:

     MEAN HIGHER HIGH WATER (MHHW)                =  1.844
     MEAN HIGH WATER (MHW)                        =  1.719
     NORTH AMERICAN VERTICAL DATUM-1988 (NAVD)    =  1.001
     MEAN TIDE LEVEL (MTL)                        =  0.888
     MEAN SEA LEVEL (MSL)                         =  0.865
     MEAN LOW WATER (MLW)                         =  0.057
     MEAN LOWER LOW WATER (MLLW)                  =  0.000

National Geodetic Vertical Datum (NGVD 29)

Bench Mark Elevation Information           In METERS above:

     Stamping or Designation               MLLW        MHW

     A 326 1970                             3.153    1.434
     B 326 1970                             3.677    1.958
     NO 3 1974                              3.174    1.455
     DUVAL R-22 1974                        5.791    4.072
     NO 1 1974 RESET 1979                   4.387    2.668
     NO 2 1974 RESET 1979                   4.036    2.317


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

                                                                                
Station ID: 8720194                                PUBLICATION DATE:  05/28/2004
Name:       LITTLE TALBOT ISLAND                              
            FLORIDA
NOAA Chart: 11490                                  Latitude:         30° 25.8' N
USGS Quad:  MAYPORT                                Longitude:        81° 24.3' 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 (NAVD 88).

NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded.  NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads.  NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at 
National Geodetic Survey.

NAVD 88 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.  NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights.  Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at 
National Geodetic Survey.

NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.

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Products available at 8720194 LITTLE TALBOT ISLAND, FL

Revised: 10/15/2013
NOAA / National Ocean Service
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