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Bench Mark Sheet for 8728973, WETAPPO CREEK, EAST BAY FL

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

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

                                                                                
Station ID: 8728973                         PUBLICATION DATE:  02/05/2004
Name:       WETAPPO CREEK, EAST BAY                           
            FL
NOAA Chart: 11389                           Latitude:   30°  2.3' N (  30.03830)
USGS Quad:  ALLANTON                        Longitude:  85° 23.6' W ( -85.39330)


To reach the tidal bench marks from the intersection of U.S. Highway 98 and
State Road 386 in Mexico Beach, proceed north on State Road 386 for 14.9 km (9.3
mi) to a paved road leading west, then west on this road (becomes a dirt road)
for 8.0 km (5.0 mi) to the driveway into the Brownes Plantation.  The bench
marks are in the vicinity of the plantation.  Tide gage and staff were located
on a free standing structure 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
                         DESIGNATION:          872 8973 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9929
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BE3817
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   30°  2.4' N (  30.04000)          LONGITUDE:  85° 23.6' W ( -85.39330)


The primary bench mark is a disk located 40 m (132 ft) SSE of bench mark 8973 C
1976, 27.89 m (91.5 ft) SW of the south corner of the Brownes residence, 8.69 m
(28.5 ft) SE of the dock, and 1.77 m (5.8 ft) west of a pine tree with a witness
sign. The bench mark is set 9 cm (0.3 ft) below ground level, crimped to the top
of a copper-clad steel rod driven 12.2 m (40 ft) 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  5

                                                                                
Station ID: 8728973                         PUBLICATION DATE:  02/05/2004
Name:       WETAPPO CREEK, EAST BAY                           
            FL
NOAA Chart: 11389                           Latitude:   30°  2.3' N (  30.03830)
USGS Quad:  ALLANTON                        Longitude:  85° 23.6' W ( -85.39330)


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


                         BENCH MARK STAMPING:  8973 B 1976
                         DESIGNATION:          872 8973 B  TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9930
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BE3814
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   30°  2.4' N (  30.04000)          LONGITUDE:  85° 23.5' W ( -85.39170)


The bench mark is a disk located on the north side of the drive at the entrance
to the Brownes Plantation, 140 m (460 ft) east of bench mark 8973 D 1976, 28 m
(92 ft) west of centerline of the dirt road, 26 m (86 ft) NW of a powerline
pole, 2 m (6 ft) north of the centerline of the driveway, and 0.3 m (1 ft) east
of the north gate post for the driveway.  The bench mark is set 9 cm (0.3 ft)
below ground level, crimped to the top of a copper-clad steel rod driven 12.2 m
(40 ft) to refusal and encased in a PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  8973 C 1976
                         DESIGNATION:          872 8973 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9931
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BE3816
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   30°  2.4' N (  30.04000)          LONGITUDE:  85° 23.6' W ( -85.39330)


The bench mark is a disk located 40 m (132 ft) NNW of bench mark 8973 A 1976, 28
m (92 ft) west of the SW corner of a metallic shed, 25 m (82 ft) NW of the west
corner of Brownes residence, and 2.3 m (7.4 ft) west of a group of pine trees
with a witness sign.  The bench mark is set level with the ground, crimped to
the top of a copper-clad steel rod driven 12.2 m (40 ft) 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  5

                                                                                
Station ID: 8728973                         PUBLICATION DATE:  02/05/2004
Name:       WETAPPO CREEK, EAST BAY                           
            FL
NOAA Chart: 11389                           Latitude:   30°  2.3' N (  30.03830)
USGS Quad:  ALLANTON                        Longitude:  85° 23.6' W ( -85.39330)


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


                         BENCH MARK STAMPING:  8973 D 1976
                         DESIGNATION:          872 8973 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9932
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BE3815
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   30°  2.4' N (  30.04000)          LONGITUDE:  85° 23.6' W ( -85.39330)


The bench mark is a disk located 140 m (460 ft) west of the entrance gate to the
driveway, 41 m (134 ft) ESE of the SE corner of a metallic shed, 12.34 m (40.5
ft) north of the centerline of the driveway leading to Brownes residence, 11 m
(37 ft) NE of a twin trunked pecan tree, and 2.0 m (6.5 ft) west of a power
pole.  The bench mark is set 9 cm (0.3 ft) below ground level, crimped to the
top of a copper-clad steel rod driven 12.2 m (40 ft) 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  4 of  5

                                                                                
Station ID: 8728973                         PUBLICATION DATE:  02/05/2004
Name:       WETAPPO CREEK, EAST BAY                           
            FL
NOAA Chart: 11389                           Latitude:   30°  2.3' N (  30.03830)
USGS Quad:  ALLANTON                        Longitude:  85° 23.6' W ( -85.39330)


                            T I D A L   D A T U M S 


Tidal datums at WETAPPO CREEK, EAST BAY based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           May 1976 - May 1976
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8729015 ALLANTON, EAST BAY


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.504
     MEAN HIGH WATER                            MHW    =  0.450
     MEAN SEA LEVEL                             MSL    =  0.256
     MEAN TIDE LEVEL                            MTL    =  0.227
     North American Vertical Datum              NAVD88 =  0.199
     MEAN LOW WATER                             MLW    =  0.004
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     8973 A 1976                                 1.064    0.614
     8973 B 1976                                 2.136    1.686
     8973 C 1976                                 1.056    0.606
     8973 D 1976                                 1.464    1.014


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

                                                                                
Station ID: 8728973                         PUBLICATION DATE:  02/05/2004
Name:       WETAPPO CREEK, EAST BAY                           
            FL
NOAA Chart: 11389                           Latitude:   30°  2.3' N (  30.03830)
USGS Quad:  ALLANTON                        Longitude:  85° 23.6' W ( -85.39330)


                             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 NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.

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 8728973 WETAPPO CREEK, EAST BAY, FL

Revised: 08/08/2018
NOAA / National Ocean Service
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