Bench Mark Sheet for 8728957, OVERSTREET

Superseded Epoch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Small blue map location marker Unpublished bench mark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  4

                                                                                
Station ID: 8728957                         PUBLICATION DATE:  08/03/2004
Name:       OVERSTREET                                        
            FL
NOAA Chart: 11389                           Latitude:   29° 59.8' N (  29.99670)
USGS Quad:  OVERSTREET                      Longitude:  85° 22.2' W ( -85.37000)


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 8.9 km (5.5
mi) to the bridge over the Intracoastal Waterway.  The bench marks are along the
highway.  The tide gage and staff were located on a pier just south of the
floating bridge on the east shore of Wetappo Creek.


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


                 PRIMARY BENCH MARK STAMPING:  8957 A 1976
                         DESIGNATION:          872 8957 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9920
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AS0857
SETTING CLASSIFICATION:  Concrete footing                      OPUS PID:        
LATITUDE:   29° 59.9' N (  29.99830)          LONGITUDE:  85° 22.2' W ( -85.37000)


The primary bench mark is a disk set flush in the concrete footing of the
traffic gate on the NE side of the floating bridge at Overstreet, 8.84 m (29.0
ft) north of the bridge tenders office, 4.39 m (14.4 ft) north of the centerline
of State Road 386, and 4.27 m (14.0 ft) NE of the NE corner of the bridge. 
NOTE: Mark not found in 1999 by US Power Squadron.

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

                                                                                
Station ID: 8728957                         PUBLICATION DATE:  08/03/2004
Name:       OVERSTREET                                        
            FL
NOAA Chart: 11389                           Latitude:   29° 59.8' N (  29.99670)
USGS Quad:  OVERSTREET                      Longitude:  85° 22.2' W ( -85.37000)


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


                         BENCH MARK STAMPING:  8957 C 1976
                         DESIGNATION:          872 8957 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9922
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AS0859
SETTING CLASSIFICATION:  Concrete footing                      OPUS PID:        
LATITUDE:   29° 59.9' N (  29.99830)          LONGITUDE:  85° 22.0' W ( -85.36670)


The bench mark is a disk set flush in the SE footing of the lookout tower at the
Florida Division of Forestry, 47.09 m (154.5 ft) south of the centerline of
State Road 386, 31.24 m (102.5 ft) west of the front step of the easternmost
house, and 10.36 m (34 ft) east of the centerline of dirt drive leading into
grounds.



                         BENCH MARK STAMPING:  8957 E 1976
                         DESIGNATION:          872 8957 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9924
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AS0856
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   29° 59.9' N (  29.99830)          LONGITUDE:  85° 22.3' W ( -85.37170)


The bench mark is a disk located 0.08 km (0.05 mi) west of the floating bridge
at Overstreet, 10.88 m (35.7 ft) west of a Gulf Oil sign, 9.85 m (32.3 ft) north
of the centerline of State Road 386, 3.81 m (12.5 ft) west of the SW corner of
the Overstreet General Store and Post Office, and 0.46 m (1.5 ft) SE of a
telephone pole A1 with a witness sign attached.  The bench mark is 0.15 m (0.5
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  3 of  4

                                                                                
Station ID: 8728957                         PUBLICATION DATE:  08/03/2004
Name:       OVERSTREET                                        
            FL
NOAA Chart: 11389                           Latitude:   29° 59.8' N (  29.99670)
USGS Quad:  OVERSTREET                      Longitude:  85° 22.2' W ( -85.37000)


                            T I D A L   D A T U M S 


Tidal datums at OVERSTREET 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   =  0.482
     MEAN HIGH WATER                            MHW    =  0.452
     MEAN TIDE LEVEL                            MTL    =  0.249
     MEAN SEA LEVEL                             MSL    =  0.245
     North American Vertical Datum              NAVD88 =  0.174
     MEAN LOW WATER                             MLW    =  0.046
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     8957 A 1976                                 2.406    1.954
     8957 C 1976                                 3.321    2.869
     8957 E 1976                                 2.833    2.381


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

                                                                                
Station ID: 8728957                         PUBLICATION DATE:  08/03/2004
Name:       OVERSTREET                                        
            FL
NOAA Chart: 11389                           Latitude:   29° 59.8' N (  29.99670)
USGS Quad:  OVERSTREET                      Longitude:  85° 22.2' W ( -85.37000)


                             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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