Superseded Bench Mark Sheet for 8729538, GARNIER BAYOU, SHALIMAR FL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:  05/23/1984
Station ID: 8729538                                SUPERCEDED DATE:   04/21/2003
Name:       SHALIMAR YACHT BASIN, GARNIER BAYOU               
            FLORIDA
NOAA Chart: 11385                                  Latitude:         30° 26.1' N
USGS Quad:  FORT WALTON BEACH                      Longitude:        86° 35.2' W


To reach the tidal bench marks at the Shalimar Yacht Basin from the bridge over
Garnier Bayou, proceed 0.2 mile (0.3 km) east along State Highway 85 (Elgin
Parkway) to the town of Shalimar.  The bench marks are located on the bridge in
the town and SW along Cherokee Road to the Shalimar Yacht Basin, and the tide
gage and staff were on the wharf along Old Ferry Road.


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


                 PRIMARY BENCH MARK STAMPING:  1 1973

MONUMENTATION:           Survey Disk                               VM#:    10153
AGENCY:                                                            PID#:  BG3403
SETTING CLASSIFICATION:  Concrete Retaining Wall


The bench mark is set flush into the top and center of a 1.0 foot (0.3 m) wide
and 6.0 feet (1.8 m) high concrete wall, 0.4 mile (0.6 km) south along Cherokee
Road from the intersection of State Highway 85 (Eglin Parkway) and Cherokee Road
in Shalimar, to Shalimar Yacht Basin at the SE end of Garnier Bayou, and 21.0
feet (6.4 m) NW of the centerline of Old Ferry Road.



                         BENCH MARK STAMPING:  2 1973

MONUMENTATION:           Survey Disk                               VM#:    10154
AGENCY:                                                            PID#:  BG3402
SETTING CLASSIFICATION:  Concrete Slab


The bench mark is set flush in a concrete slab, 0.4 mile (0.6 km) south along
Cherokee Road from the intersection of State Highway 85 (Eglin Parkway) and
Cherokee Road in Shalimar to Gardner Drive, 250 feet (76.2 m) NW along Gardner
Drive, 85 feet (25.9 m) SW of the centerline of road, 1.0 foot (0.3 m) SW of the
west corner, and 0.5 foot (0.2 m) SW of the SW face of a one story building.

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

                                                   PUBLICATION DATE:  05/23/1984
Station ID: 8729538                                SUPERCEDED DATE:   04/21/2003
Name:       SHALIMAR YACHT BASIN, GARNIER BAYOU               
            FLORIDA
NOAA Chart: 11385                                  Latitude:         30° 26.1' N
USGS Quad:  FORT WALTON BEACH                      Longitude:        86° 35.2' W


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


                         BENCH MARK STAMPING:  9538 A

MONUMENTATION:           Survey Disk                               VM#:    10155
AGENCY:                                                            PID#:  BG3401
SETTING CLASSIFICATION:  Concrete Abutment


The bench mark is set flush in the center of a l foot (0.3 m) wide concrete
abutment 1 foot (0.3 m) above the level of the highway, 0.2 mile (0.3 km) west
along State Highway 85 (Elgin Parkway) from the post office in Shalimar, on the
east end of Garnier Bayou Bridge over Garnier Bayou, 32 feet (9.8 m) south of
the centerline of the highway, and 2 feet (0.6 m) south of the east end of the
south bridge rail.



                         BENCH MARK STAMPING:  Q 297 1967

MONUMENTATION:           Survey Disk                               VM#:    10156
AGENCY:                                                            PID#:  BG2047
SETTING CLASSIFICATION:  Concrete Post


The bench mark is set in the top of a concrete post flush with the ground, level
with the sidewalk, 0.2 miles (0.3 km) east along Richbourg Avenue from the east
end of Meigs Junior High School at Shalimar, 151 feet (46.0 m) NW of and across
Richbourg Avenue from the SW bound lane of Florida Route 85, 31 feet (9.4 m)
east of the centerline of Carl Brandt Drive, 25 feet (7.6 m) north of the
centerline of Richbourg Avenue, 4.5 feet (1.4 m) SE of the SW corner post of a
fence around a park, and 1 foot (0.3 m) north of the north edge of a sidewalk
along the north side of the avenue.

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

                                                   PUBLICATION DATE:  05/23/1984
Station ID: 8729538                                SUPERCEDED DATE:   04/21/2003
Name:       SHALIMAR YACHT BASIN, GARNIER BAYOU               
            FLORIDA
NOAA Chart: 11385                                  Latitude:         30° 26.1' N
USGS Quad:  FORT WALTON BEACH                      Longitude:        86° 35.2' W


                            T I D A L   D A T U M S 


Tidal datums at SHALIMAR YACHT BASIN, GARNIER BAYOU based on:

     LENGTH OF SERIES:      45 MONTHS
     TIME PERIOD:           MARCH 1973-FEBRUARY 1978
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8729840 PENSACOLA


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

     HIGHEST OBSERVED WATER LEVEL (09/23/1975)         =   5.10
     MEAN HIGHER HIGH WATER                     MHHW   =   0.42
     MEAN HIGH WATER                            MHW    =   0.40
     MEAN TIDE LEVEL                            MTL    =   0.22
     MEAN LOW WATER                             MLW    =   0.04
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (01/03/1973)         =  -1.42

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     1 1973                                      9.78      9.38
     2 1973                                      7.42      7.02
     9538 A                                     11.72     11.32
     Q 297 1967                                 15.83     15.43


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

                                                   PUBLICATION DATE:  05/23/1984
Station ID: 8729538                                SUPERCEDED DATE:   04/21/2003
Name:       SHALIMAR YACHT BASIN, GARNIER BAYOU               
            FLORIDA
NOAA Chart: 11385                                  Latitude:         30° 26.1' N
USGS Quad:  FORT WALTON BEACH                      Longitude:        86° 35.2' 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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