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Superseded Bench Mark Sheet for 8724962, FAKAHATCHEE RIVER ENTRANCE FL

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                   PUBLICATION DATE:  03/24/1988
Station ID: 8724962                                SUPERCEDED DATE:   04/21/2003
Name:       FAKAHATCHEE RIVER ENTRANCE, FAKAHATCHEE BAY       
            FLORIDA
NOAA Chart: 11429                                  Latitude:         25° 53.4' N
USGS Quad:  WEAVERS STATION                        Longitude:        81° 28.6' W


To reach the tidal bench marks from Naples proceed SE on U.S. 41 to the Remuda
Ranch, then by boat south down the Faka Union River to the vicinity of marker 46
in Faka Union Bay, then east to Fakahatchee Bay, continue east in Fakahatchee
Bay to a sand beach on the point of land separating the Fakahatchee River from
the East River.  The bench marks are north of the sand beach in the vicinity of
concrete cisterns.  The tide gage and staff were located on a platform 150 feet
(46 m) south of the sand beach.


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


                 PRIMARY BENCH MARK STAMPING:  4962 B 1978

MONUMENTATION:           Survey Disk                               VM#:     9721
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Unspecified Steel Rod


The bench mark is 75.5 feet (23.0 m) SSE of Bench Mark 4962 A 1978, 35.1 feet
(10.7 m) SSE of east corner of the smaller of a pair of broken cisterns, 28.9
feet (8.8 m) NW of the north corner of the southernmost cistern, 18.9 feet (5.8
m) south of the root mass of an overturned tree, and 1.5 feet (0.5 m) south of
an old witness post.  The bench mark is 0.6 foot (0.2 m) above ground level,
crimped to an unspecified steel rod driven 35 feet (11 m) to refusal, and
encased in a PVC pipe.



                         BENCH MARK STAMPING:  4962 A 1978

MONUMENTATION:           Survey Disk                               VM#:     9720
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is is 42.0 feet (12.8 m) south of the center of a camp area. 29.9
feet (9.1 m) WNW of the west corner of a large intact cistern dated 1909, 18.9
feet (5.8 m) north of the northernmost corner of a large pair of broken
cisterns, 7.9 feet (2.4 m) south of the concrete rubble from a 3 x 8 foot (1 x 2
m) trough, 1.7 feet (0.5 m) SW of a witness post, and 0.4 foot (0.1 m) below
ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                   PUBLICATION DATE:  03/24/1988
Station ID: 8724962                                SUPERCEDED DATE:   04/21/2003
Name:       FAKAHATCHEE RIVER ENTRANCE, FAKAHATCHEE BAY       
            FLORIDA
NOAA Chart: 11429                                  Latitude:         25° 53.4' N
USGS Quad:  WEAVERS STATION                        Longitude:        81° 28.6' W


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


                         BENCH MARK STAMPING:  4962 C 1978

MONUMENTATION:           Survey Disk                               VM#:     9722
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is 116.8 feet (35.6 m) SE of Bench Mark 4962 B 1978, 15.8 feet
(4.8 m) north of a large patch of cactus, 7.6 feet (2.3 m) NE of a large bramble
bush, 7.0 feet (2.1 m) SW of a clump of trees, 1.6 feet (0.5 m) SW of a new
witness post, and 1.3 feet (0.4 m) west of an old witness post.



                         BENCH MARK STAMPING:  4962 D 1978

MONUMENTATION:           Survey Disk                               VM#:     9723
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is 99.7 feet (30.4 m) ESE of Bench Mark 4962 C 1978, 26.0 feet
(7.9 m) WNW of a large root clump of an overturned tree, 11.3 feet (3.4 m) SE of
the largest of two pine trees, 8 feet (2 m) north of the approximate shoreline,
1.2 feet (0.4 m) SSW of an old witness post, 1.2 feet (0.4 m) NNE of a new
witness post, and 0.2 foot (0.1 m) below ground level.



                         BENCH MARK STAMPING:  4962 E 1978

MONUMENTATION:           Survey Disk                               VM#:     9724
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is in the center of a 20 foot (6 m) wide shell ridge, 145 feet
(44 m) NE of Bench Mark 4962 D 1978, 16.9 feet (5.2 m) NE of the north corner of
a concrete water trough, 13.8 feet (4.2 m) SW of a large tree, 1.4 feet (0.4 m)
west of an old witness post, 1.4 feet (0.4 m) east of a new witness post, and
0.1 foot (0.03 m) below ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                   PUBLICATION DATE:  03/24/1988
Station ID: 8724962                                SUPERCEDED DATE:   04/21/2003
Name:       FAKAHATCHEE RIVER ENTRANCE, FAKAHATCHEE BAY       
            FLORIDA
NOAA Chart: 11429                                  Latitude:         25° 53.4' N
USGS Quad:  WEAVERS STATION                        Longitude:        81° 28.6' W


                            T I D A L   D A T U M S 


Tidal datums at FAKAHATCHEE RIVER ENTRANCE, FAKAHATCHEE BAY based on:

     LENGTH OF SERIES:      5 MONTHS
     TIME PERIOD:           JANUARY-MAY 1978
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8724967 MARCO ISLAND


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

     HIGHEST OBSERVED WATER LEVEL (05/04/1978)         =   4.32
     MEAN HIGHER HIGH WATER                     MHHW   =   3.16
     MEAN HIGH WATER                            MHW    =   2.89
     MEAN TIDE LEVEL                            MTL    =   1.64
     MEAN LOW WATER                             MLW    =   0.38
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (03/18/1978)         =  -0.90



Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     4962 B 1978                                 6.14      3.25
     4962 A 1978                                 5.74      2.85
     4962 C 1978                                 4.61      1.72
     4962 D 1978                                 4.25      1.36
     4962 E 1978                                 5.51      2.62


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

                                                   PUBLICATION DATE:  03/24/1988
Station ID: 8724962                                SUPERCEDED DATE:   04/21/2003
Name:       FAKAHATCHEE RIVER ENTRANCE, FAKAHATCHEE BAY       
            FLORIDA
NOAA Chart: 11429                                  Latitude:         25° 53.4' N
USGS Quad:  WEAVERS STATION                        Longitude:        81° 28.6' 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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