Superseded Bench Mark Sheet for 8729736, WOODLAWN BEACH FL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:  11/20/1990
Station ID: 8729736                                SUPERCEDED DATE:   04/21/2003
Name:       WOODLAWN BEACH, SANTA ROSA SOUND                  
            FLORIDA
NOAA Chart: 11382                                  Latitude:         30° 23.2' N
USGS Quad:  HOLLEY                                 Longitude:        86° 59.8' W


To reach the tidal bench marks from the junction of U.S. Highway 98 and State
Highway 87 in Navarre, proceed west on U.S. Highway 98 for 7.0 miles (11.3 km)
to Oak Street, then south on Oak Street for 0.9 mile (1.4 km) to Soundside Drive
and the residence of Mike Simpson, at the SW corner of the intersection.  The
bench marks are along Soundside Drive and Oak Street.  The tide gage and staff
were on a private dock south of the Simpson Residence.


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


                 PRIMARY BENCH MARK STAMPING:  9736 E 1977

MONUMENTATION:           Survey Disk                               VM#:    10212
AGENCY:                                                            PID#:  BG4558
SETTING CLASSIFICATION:  Galvanized Steel Rod


The bench mark is 300 feet (91 m) west of Bench Mark 9736 A 1977, 25.5 feet (7.8
m) NNW of the centerline of Soundside Drive, and 0.2 foot (0.1 m) south of a
witness post.  The bench mark is 0.2 foot (0.1 m) below ground level, crimped to
a galvanized steel rod driven an unspecified depth to refusal, and encased in a
PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  RANCH 2 1910 1934

MONUMENTATION:           Survey Disk                               VM#:    10209
AGENCY:                                                            PID#:  BG1892
SETTING CLASSIFICATION:  Shallow-set Pipe


The bench mark is set in a vitrified clay pipe in the front lawn of the fourth
house west of where a power cable crosses the sound, 56.9 feet (17.3 m) SW of
the SE corner of the house, 56.6 feet (17.3 m) SE of the SW corner of the house,
1.7 feet (0.5 m) west of the west edge of a sidewalk, and level with the ground.

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

                                                   PUBLICATION DATE:  11/20/1990
Station ID: 8729736                                SUPERCEDED DATE:   04/21/2003
Name:       WOODLAWN BEACH, SANTA ROSA SOUND                  
            FLORIDA
NOAA Chart: 11382                                  Latitude:         30° 23.2' N
USGS Quad:  HOLLEY                                 Longitude:        86° 59.8' W


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


                         BENCH MARK STAMPING:  9736 A 1977

MONUMENTATION:           Survey Disk                               VM#:    10210
AGENCY:                                                            PID#:  BG4557
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set flush in the top of a concrete monument, 154.7 feet (47.2
m) north of the gate in the fence around the Peterson residence, 80 feet (24 m)
NW of the NW corner of the Simpson residence, 50 feet (15 m) SSW of the
intersection of Soundside Drive and Oak Street, 1.8 feet (0.5 m) east of a power
pole with witness sign, and level with the ground.



                         BENCH MARK STAMPING:  9736 C 1977

MONUMENTATION:           Survey Disk                               VM#:    10211
AGENCY:                                                            PID#:  BG4560
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in the top of concrete monument, 370 feet (113 m) ENE of
Bench Mark 9736 A 1977, 90 feet (27 m) NE of the driveway to the Knight
residence, 32.7 feet (10.0 m) NW of the centerline of Soundside Drive, 0.4 foot
(0.1 m) north of a witness post, and level with the ground.



                         BENCH MARK STAMPING:  9736 F 1985

MONUMENTATION:           Survey Disk                               VM#:    10213
AGENCY:                                                            PID#:  BG4559
SETTING CLASSIFICATION:  Concrete Culvert Headwall


The bench mark is set in the top of concrete culvert headwall, 0.1 mile (0.2 km)
west of Bench Mark 9736 E 1977, 31.0 feet (9.4 m) south of the centerline of
Soundside Drive, 7.5 feet (2.3 m) SW of a 1.5-foot (0.5 m) diameter oak tree,
and 7.0 feet (2.1 m) east of the west end of the headwall.

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

                                                   PUBLICATION DATE:  11/20/1990
Station ID: 8729736                                SUPERCEDED DATE:   04/21/2003
Name:       WOODLAWN BEACH, SANTA ROSA SOUND                  
            FLORIDA
NOAA Chart: 11382                                  Latitude:         30° 23.2' N
USGS Quad:  HOLLEY                                 Longitude:        86° 59.8' W


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


                         BENCH MARK STAMPING:  9736 G 1985

MONUMENTATION:           Survey Disk                               VM#:    10214
AGENCY:                                                            PID#:  BG4556
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in the top of concrete monument, 0.45 mile (0.72 km) north
of Bench Mark 9736 A 1977, 215 feet (66 m) south of a driveway at Rural Route
2-Box 998, 24.9 feet (7.6 m) west of the centerline of Oak Street, 2.0 feet (0.6
m) NNE of a power pole, 1.5 feet (0.5 m) east of a witness post, and at ground
level.

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

                                                   PUBLICATION DATE:  11/20/1990
Station ID: 8729736                                SUPERCEDED DATE:   04/21/2003
Name:       WOODLAWN BEACH, SANTA ROSA SOUND                  
            FLORIDA
NOAA Chart: 11382                                  Latitude:         30° 23.2' N
USGS Quad:  HOLLEY                                 Longitude:        86° 59.8' W


                            T I D A L   D A T U M S 


Tidal datums at WOODLAWN BEACH, SANTA ROSA SOUND based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           JANUARY-APRIL 1986
     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 (09/04/1977)         =   2.72
     MEAN HIGHER HIGH WATER                     MHHW   =   1.38
     MEAN HIGH WATER                            MHW    =   1.32
     MEAN TIDE LEVEL                            MTL    =   0.68
     MEAN LOW WATER                             MLW    =   0.04
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (01/21/1985)         =  -1.45

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     9736 E 1977                                 7.33      6.01
     RANCH 2 1910 1934                           6.32      5.00
     9736 A 1977                                17.10     15.78
     9736 C 1977                                12.87     11.55
     9736 F 1985                                 6.22      4.90
     9736 G 1985                                20.58     19.26


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

                                                   PUBLICATION DATE:  11/20/1990
Station ID: 8729736                                SUPERCEDED DATE:   04/21/2003
Name:       WOODLAWN BEACH, SANTA ROSA SOUND                  
            FLORIDA
NOAA Chart: 11382                                  Latitude:         30° 23.2' N
USGS Quad:  HOLLEY                                 Longitude:        86° 59.8' 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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