Superseded Bench Mark Sheet for 8725366, MATANZAS PASS, ESTERO ISLAND FL

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  03/09/1989
Station ID: 8725366                                SUPERCEDED DATE:   04/21/2003
Name:       ESTERO ISLAND, MATANZAS PASS                      
            FLORIDA
NOAA Chart: 11426                                  Latitude:         26° 27.4' N
USGS Quad:  FORT MYERS BEACH                       Longitude:        81° 57.2' W


To reach the tidal bench marks from the State Highway 865 swing bridge over
Matanzas Pass, proceed south on State Highway 865 and take the first right turn
to Beach Marina at the SE end of the bridge.  The bench marks are located near
the marina and on the west side of Highway 865.  The tide gage and staff were
located near the shoreward end of the marina pier.


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


                 PRIMARY BENCH MARK STAMPING:  BM 2 1965

MONUMENTATION:           Survey Disk                               VM#:     7299
AGENCY:                                                            PID#:  AD1372
SETTING CLASSIFICATION:  Concrete Sea Wall


The bench mark is set flush in the top of the sea wall at Beach Marina, 162 feet
(49 m) east of Bench Mark BM 1 1965, 50 feet (15 m) west of a curve in the sea
wall, and 44 feet (13 m) east of the east edge of the boat dock.



                         BENCH MARK STAMPING:  BM 1 1965

MONUMENTATION:           Survey Disk                               VM#:     7298
AGENCY:                                                            PID#:  AD1373
SETTING CLASSIFICATION:  Concrete Sea Wall


The bench mark is set flush in the top of a concrete sea wall at Beach Marina,
135 feet (41 m) east of the centerline of the highway measured from the south
end of the bridge, 90 feet (27 m) NW of a utility pole with transformer, 29.5
feet (9.0 m) NE of the NE corner of the marina, and 2 feet (1 m) east of the
east edge of the boat dock.

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

                                                   PUBLICATION DATE:  03/09/1989
Station ID: 8725366                                SUPERCEDED DATE:   04/21/2003
Name:       ESTERO ISLAND, MATANZAS PASS                      
            FLORIDA
NOAA Chart: 11426                                  Latitude:         26° 27.4' N
USGS Quad:  FORT MYERS BEACH                       Longitude:        81° 57.2' W


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


                         BENCH MARK STAMPING:  NO 3 1965

MONUMENTATION:           Survey Disk                               VM#:     7300
AGENCY:                                                            PID#:  AD1374
SETTING CLASSIFICATION:  Concrete Flag Pole Base


The bench mark is set flush in the top of a 4-foot (1 m) square concrete base of
the parking lot flag pole, 75 feet (23 m) north of the NW post on an open boat
shed, 73 feet (22 m) west of the centerline of the highway, and 18 feet (5 m) SW
of the approximate shoreline.



                         BENCH MARK STAMPING:  5366 D 1984

MONUMENTATION:           Survey Disk                               VM#:     7301
AGENCY:                                                            PID#:  AD7850
SETTING CLASSIFICATION:  Bridge Pier


The bench mark is set in the foundation for the seventh bridge pier north of the
south end of the bridge, 11 feet (3 m) NW of the steps to the catwalk under the
bridge, and 1.5 feet (0.5 m) west of the westernmost pile.



                         BENCH MARK STAMPING:  5366 E 1984

MONUMENTATION:           Survey Disk                               VM#:     7302
AGENCY:                                                            PID#:  AD7851
SETTING CLASSIFICATION:  Loading Platform


The bench mark is set in the top of the loading platform at the U.S. Post Office
in Fort Myers Beach, 3 feet (1 m) SE of the north corner of the post office.

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

                                                   PUBLICATION DATE:  03/09/1989
Station ID: 8725366                                SUPERCEDED DATE:   04/21/2003
Name:       ESTERO ISLAND, MATANZAS PASS                      
            FLORIDA
NOAA Chart: 11426                                  Latitude:         26° 27.4' N
USGS Quad:  FORT MYERS BEACH                       Longitude:        81° 57.2' W


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


                         BENCH MARK STAMPING:  5366 F

MONUMENTATION:           Survey Disk                               VM#:     7303
AGENCY:                                                            PID#:  AD7852
SETTING CLASSIFICATION:  Bridge Rail


The bench mark is set in the top of the bridge rail over the SW abutment of the
bridge, 350 feet (107 m) NE of the SW end of the railing, and 20.5 feet (6.2 m)
SE of the centerline of the bridge.



                         BENCH MARK STAMPING:  5366 G

MONUMENTATION:           Survey Disk                               VM#:     7304
AGENCY:                                                            PID#:  AD7844
SETTING CLASSIFICATION:  Bridge Rail


The bench mark is set in the top of the bridge rail over the NE abutment of the
bridge, 250 feet (76 m) SW of the NE end of the railing, and 21 feet (6 m) NW of
the centerline of the bridge.

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

                                                   PUBLICATION DATE:  03/09/1989
Station ID: 8725366                                SUPERCEDED DATE:   04/21/2003
Name:       ESTERO ISLAND, MATANZAS PASS                      
            FLORIDA
NOAA Chart: 11426                                  Latitude:         26° 27.4' N
USGS Quad:  FORT MYERS BEACH                       Longitude:        81° 57.2' W


                            T I D A L   D A T U M S 


Tidal datums at ESTERO ISLAND, MATANZAS PASS based on:

     LENGTH OF SERIES:      12 MONTHS
     TIME PERIOD:           JUNE 1965-MAY 1966
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8725110 NAPLES


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

     HIGHEST OBSERVED WATER LEVEL (09/09/1965)         =   4.52
     MEAN HIGHER HIGH WATER                     MHHW   =   2.70
     MEAN HIGH WATER                            MHW    =   2.44
     MEAN TIDE LEVEL                            MTL    =   1.49
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   1.04
     MEAN LOW WATER                             MLW    =   0.55
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (02/05/1966)         =  -1.74

   * NGVD reference based on elevations published in Quad 260813, 1969, and NOS
     leveling of 1974. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     BM 2 1965                                   4.50      2.06
     BM 1 1965                                   4.48      2.04
     NO 3 1965                                   7.28      4.84
     5366 D 1984                                 4.60      2.16
     5366 E 1984                                 8.08      5.64
     5366 F                                     24.83     22.39
     5366 G                                     24.69     22.25


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

                                                   PUBLICATION DATE:  03/09/1989
Station ID: 8725366                                SUPERCEDED DATE:   04/21/2003
Name:       ESTERO ISLAND, MATANZAS PASS                      
            FLORIDA
NOAA Chart: 11426                                  Latitude:         26° 27.4' N
USGS Quad:  FORT MYERS BEACH                       Longitude:        81° 57.2' 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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