Superseded Bench Mark Sheet for 8728973, WETAPPO CREEK, EAST BAY FL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:  06/14/1984
Station ID: 8728973                                SUPERCEDED DATE:   04/21/2003
Name:       WETAPPO CREEK, EAST BAY                           
            FLORIDA
NOAA Chart: 11389                                  Latitude:         30°  2.3' N
USGS Quad:  ALLANTON                               Longitude:        85° 23.6' W


To reach the tidal bench marks from the intersection of U.S. Highway 98 and
Highway 5386 A in Mexico Beach proceed east on 5386 A for 1.1 miles (1.8 km) to
Highway 5386, then NE on 5386 for 9.0 miles (14.5 km) to a paved road on the
west side of Highway 5386, turn left onto paved road and proceed NW for 5.5
miles (8.9 km) to the drive leading into the Brownes Plantation.  The bench
marks are located around the plantation, and the tide gage and staff were
located on a free standing support in the bay.


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


                 PRIMARY BENCH MARK STAMPING:  8973 A 1976

MONUMENTATION:           Survey Disk                               VM#:     9929
AGENCY:                                                            PID#:  BE3817
SETTING CLASSIFICATION:  Copper-Coated Steel Rod


The bench mark is 132 feet (40 m) SSE of Bench Mark 8973 C 1976, 91.5 feet (27.9
m) south of the SW corner of the Brownes residence, 28.5 feet (8.7 m) SE of dock
and 5.8 feet (1.8 m) west of a pine tree with a witness sign. The bench mark is
0.3 foot (0.1 m) below ground level, crimped to a copper-coated steel rod driven
40 feet (12 m) to refusal and encased in a PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  8973 B 1976

MONUMENTATION:           Survey Disk                               VM#:     9930
AGENCY:                                                            PID#:  BE3814
SETTING CLASSIFICATION:  Copper-Coated Steel Rod


The bench mark is on the north side of the drive at the entrance to the Brownes
Plantation, 460 feet (140 m) east of Bench Mark 8973 D 1976, 92 feet (28 m) west
of centerline of the dirt road leading to the plantation 86 feet (26 m) NNW of a
power pole, 6 feet (2 m) north of the centerline of the drive an 1.0 foot (0.3
m) east of the north gate post.  The bench mark is 0.3 feet (0.1 m) below ground
level, crimped to a copper-coated steel rod driven 40 feet (12 m) to refusal and
encased in a PVC pipe and concrete kickblock.

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

                                                   PUBLICATION DATE:  06/14/1984
Station ID: 8728973                                SUPERCEDED DATE:   04/21/2003
Name:       WETAPPO CREEK, EAST BAY                           
            FLORIDA
NOAA Chart: 11389                                  Latitude:         30°  2.3' N
USGS Quad:  ALLANTON                               Longitude:        85° 23.6' W


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


                         BENCH MARK STAMPING:  8973 C 1976

MONUMENTATION:           Survey Disk                               VM#:     9931
AGENCY:                                                            PID#:  BE3816
SETTING CLASSIFICATION:  Copper-Coated Steel Rod


The bench mark is at the NW corner of Brownes Plantation, 132 feet (40 m) NNW of
Bench Mark 8973 A 1976, 92 feet (28 m) SW of the SW corner of a metallic shed,
82 feet (25 m) NW of the NW corner of Brownes Plantation residence, and 7.4 feet
(2.3 m) west of a group of pine trees with a witness sign.  The bench mark is
level with the ground, crimped to a copper-coated steel rod driven 40 feet (12
m) to refusal and encased in a PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  8973 D 1976

MONUMENTATION:           Survey Disk                               VM#:     9932
AGENCY:                                                            PID#:  BE3815
SETTING CLASSIFICATION:  Copper-Coated Steel Rod


The bench mark is 460 feet (140 m) west of Bench Mark 8973 B 1976, 134 feet (41
m) ESE of SE corner of a metallic shed, 40.5 feet (12.3 m) NW of centerline of
drive leading to Brownes Plantation, 37 feet (11 m) north of a twin trunked
pecan tree, and 6.5 feet (2.0 m) west of a power pole.  The bench mark is 0.3
foot (0.1 m) below ground level, crimped to a copper-coated steel rod driven 40
feet (12 m) to refusal and encased in a PVC pipe and concrete kickblock.

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

                                                   PUBLICATION DATE:  06/14/1984
Station ID: 8728973                                SUPERCEDED DATE:   04/21/2003
Name:       WETAPPO CREEK, EAST BAY                           
            FLORIDA
NOAA Chart: 11389                                  Latitude:         30°  2.3' N
USGS Quad:  ALLANTON                               Longitude:        85° 23.6' W


                            T I D A L   D A T U M S 


Tidal datums at WETAPPO CREEK, EAST BAY based on:

     LENGTH OF SERIES:      1 MONTHS
     TIME PERIOD:           MAY 1976
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8729015 ALLANTON, EAST BAY


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

     HIGHEST OBSERVED WATER LEVEL (05/15/1976)         =   2.97
     MEAN HIGHER HIGH WATER                     MHHW   =   1.70
     MEAN HIGH WATER                            MHW    =   1.48
     MEAN TIDE LEVEL                            MTL    =   0.75
     MEAN LOW WATER                             MLW    =   0.02
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (05/05/1976)         =  -0.37

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     8973 A 1976                                 3.64      2.16
     8973 B 1976                                 7.16      5.68
     8973 C 1976                                 3.61      2.13
     8973 D 1976                                 4.95      3.47


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

                                                   PUBLICATION DATE:  06/14/1984
Station ID: 8728973                                SUPERCEDED DATE:   04/21/2003
Name:       WETAPPO CREEK, EAST BAY                           
            FLORIDA
NOAA Chart: 11389                                  Latitude:         30°  2.3' N
USGS Quad:  ALLANTON                               Longitude:        85° 23.6' 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.

Return to Top
Products available at 8728973 WETAPPO CREEK, EAST BAY, FL