Superseded Bench Mark Sheet for 8729197, WEST BAY CREEK WEST BAY FL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:  08/14/1991
Station ID: 8729197                                SUPERCEDED DATE:   04/21/2003
Name:       WEST BAY CREEK, WEST BAY, ST. ANDREW BAY          
            FLORIDA
NOAA Chart: 11389                                  Latitude:         30° 17.6' N
USGS Quad:  WEST BAY                               Longitude:        85° 51.5' W


To reach the tidal bench marks from state highway 79 in West Bay proceed NE on
State Highway 79 to the drawbridge over West Bay Creek.  The bench marks are
along state highway 79 and near the fish market.  The tide gage and staff were
east of the bridge at the end of the most SE dock at Whites Fish Market.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1975

MONUMENTATION:           Survey Disk                               VM#:    10067
AGENCY:                                                            PID#:  BE1325
SETTING CLASSIFICATION:  Concrete Sea Wall


The primary bench mark is set in the top of a concrete sea wall at Whites Fish
Market, 129.0 feet (39.3 m) ESE of Bench Mark NO 2 1975, 53.5 feet (16.3 m) SE
of the NW corner of a wood frame building and 20.0 feet (6.1 m) SW of the NE
corner of the sea wall.



                         BENCH MARK STAMPING:  WEST BAY NO 2 1935

MONUMENTATION:           Survey Disk                               VM#:    10064
AGENCY:                                                            PID#:  BE0634
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in the top of a concrete monument, 193 feet (59 m) west of
the SW end of the NW concrete bannister of the bridge, 111.5 feet (34.0 m) NNW
of the north corner of a two-story concrete block building, 8 feet (2 m) SE of a
0.8-foot (0.2 m) diameter oak tree, 1 foot (0.3 m) NE of the NE side of a mobile
home, and 0.4 foot (0.1 m) above ground level.  Note:  The concrete monument is
leaning slightly.

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

                                                   PUBLICATION DATE:  08/14/1991
Station ID: 8729197                                SUPERCEDED DATE:   04/21/2003
Name:       WEST BAY CREEK, WEST BAY, ST. ANDREW BAY          
            FLORIDA
NOAA Chart: 11389                                  Latitude:         30° 17.6' N
USGS Quad:  WEST BAY                               Longitude:        85° 51.5' W


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


                         BENCH MARK STAMPING:  P 176 1957

MONUMENTATION:           Survey Disk                               VM#:    10065
AGENCY:                                                            PID#:  BE0633
SETTING CLASSIFICATION:  Bridge Abutment


The bench mark is set in top of the SE end of the NE abutment of the bridge,
18.5 feet (5.6 m) SE of the centerline of the highway, and 0.5 foot (0.2 m)
above the level of the road.



                         BENCH MARK STAMPING:  N 177 1957

MONUMENTATION:           Survey Disk                               VM#:    10066
AGENCY:                                                            PID#:  BE0635
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is 0.15 mile (0.24 km) SW of the SW end of the bridge 67.0 feet
(20.4 m) SSE of the center of the junction of the highway and a paved road
leading south to West Bay School, 63.0 feet (19.2 m) SE of the centerline of the
highway, 41.0 feet (12.5 m) east of the centerline of the paved road leading
south, 40.0 feet (12.2 m) SW of the west corner of a house, 20.5 feet (6.2 m) SE
of a powerline pole, and 1.5 feet (0.5 m) NW of a witness post.  The bench mark
is 0.2 foot (0.1 m) above ground level, crimped to the top of a copper-clad
steel rod driven 50 feet (15 m) to refusal, and encased in a tile pipe.



                         BENCH MARK STAMPING:  NO 2 1975

MONUMENTATION:           Survey Disk                               VM#:    10068
AGENCY:                                                            PID#:  BE1324
SETTING CLASSIFICATION:  Concrete Step


The bench mark is set flush in the concrete step at the NE side and rear of
Whites Fish Market and 13 feet (4 m) south of the sea wall 2.0 feet (0.6 m) from
the NW corner of the fish market building.

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

                                                   PUBLICATION DATE:  08/14/1991
Station ID: 8729197                                SUPERCEDED DATE:   04/21/2003
Name:       WEST BAY CREEK, WEST BAY, ST. ANDREW BAY          
            FLORIDA
NOAA Chart: 11389                                  Latitude:         30° 17.6' N
USGS Quad:  WEST BAY                               Longitude:        85° 51.5' W


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


                         BENCH MARK STAMPING:  NO 3 1975

MONUMENTATION:           Survey Disk                               VM#:    10069
AGENCY:                                                            PID#:  BE1323
SETTING CLASSIFICATION:  Concrete Walkway


The bench mark is set in the concrete walkway  at the front entrance to Whites
Fish Market, 80.0 feet (24.4 m) NW of a powerline pole, 26.0 feet (7.9 m) SE of
the west corner of fish market building, 21.5 feet (6.6 m) NW  of the west
corner of a brick house and 3.5 feet (1.1 m) NW of the SE corner of the fish
market building.



                         BENCH MARK STAMPING:  NO 6 1975

MONUMENTATION:           Survey Disk                               VM#:    10070
AGENCY:                                                            PID#:  BE1322
SETTING CLASSIFICATION:  Concrete Wing Wall


The bench mark is set in the SE end of the SW abutment wing wall of the bridge,
0.2 mile (0.3 km) south of Bench Mark P 176 1957, 18.5 feet (5.6 m) SE of the
centerline of the highway and 16.5 feet (5.0 m) NE of the center of a manhole
cover on the SE side of the highway.

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

                                                   PUBLICATION DATE:  08/14/1991
Station ID: 8729197                                SUPERCEDED DATE:   04/21/2003
Name:       WEST BAY CREEK, WEST BAY, ST. ANDREW BAY          
            FLORIDA
NOAA Chart: 11389                                  Latitude:         30° 17.6' N
USGS Quad:  WEST BAY                               Longitude:        85° 51.5' W


                            T I D A L   D A T U M S 


Tidal datums at WEST BAY CREEK, WEST BAY, ST. ANDREW BAY based on:

     LENGTH OF SERIES:      10 MONTHS
     TIME PERIOD:           FEBRUARY-NOVEMBER 1976
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8729108 PANAMA CITY


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

     HIGHEST OBSERVED WATER LEVEL (12/25/1977)         =   3.27
     MEAN HIGHER HIGH WATER                     MHHW   =   1.51
     MEAN HIGH WATER                            MHW    =   1.38
     MEAN TIDE LEVEL                            MTL    =   0.76
     MEAN LOW WATER                             MLW    =   0.13
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (11/17/1976)         =  -1.65

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1975                                   4.06      2.68
     WEST BAY NO 2 1935                          8.59      7.21
     P 176 1957                                 17.63     16.25
     N 177 1957                                  7.07      5.69
     NO 2 1975                                   3.97      2.59
     NO 3 1975                                   7.28      5.90
     NO 6 1975                                  12.47     11.09


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

                                                   PUBLICATION DATE:  08/14/1991
Station ID: 8729197                                SUPERCEDED DATE:   04/21/2003
Name:       WEST BAY CREEK, WEST BAY, ST. ANDREW BAY          
            FLORIDA
NOAA Chart: 11389                                  Latitude:         30° 17.6' N
USGS Quad:  WEST BAY                               Longitude:        85° 51.5' 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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Products available at 8729197 WEST BAY CREEK WEST BAY, FL