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Bench Mark Sheet for 8729387, BASIN BAYOU, CHOCTAWHATCHEE 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 8729387                         PUBLICATION DATE:  01/23/2004
Name:       BASIN BAYOU, CHOCTAWHATCHEE BAY                   
            FL
NOAA Chart: 11388                           Latitude:   30° 29.2' N (  30.48670)
USGS Quad:  CHOCTAW BEACH                   Longitude:  86° 15.2' W ( -86.25330)


To reach the tidal bench marks from the intersection of State Highway 20 and
U.S. Highway 331 in Freeport, proceed 12.4 km (7.7 mi) west along Highway 20 to
the highway bridge over Basin Bayou.  The bench marks are along State Highway
20.  The tide gage and staff were located on the Nicks Sea Food Restaurant dock
at entrance to the bayou.


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


                 PRIMARY BENCH MARK STAMPING:  9387 A 1977
                         DESIGNATION:          872 9387 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10111
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BG3584
SETTING CLASSIFICATION:  Concrete bridge railing               OPUS PID:        
LATITUDE:   30° 29.2' N (  30.48670)          LONGITUDE:  86° 15.1' W ( -86.25170)


The primary bench mark is a disk set in top of the concrete railing at the east
corner of the State Highway 20 bridge over Basin Bayou, 6.80 m (22.3 ft) NE of
the centerline of the highway, and 0.91 m (3.0 ft) above highway level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8729387                         PUBLICATION DATE:  01/23/2004
Name:       BASIN BAYOU, CHOCTAWHATCHEE BAY                   
            FL
NOAA Chart: 11388                           Latitude:   30° 29.2' N (  30.48670)
USGS Quad:  CHOCTAW BEACH                   Longitude:  86° 15.2' W ( -86.25330)


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


                         BENCH MARK STAMPING:  2 1939
                         DESIGNATION:          872 9387 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:        10112
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BG2181
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   30° 29.2' N (  30.48670)          LONGITUDE:  86° 15.1' W ( -86.25170)


The bench mark is a disk set into the top of a concrete monument, 0.24 km (0.15
mi) west of the bridge over Basin Bayou, 76 m (249 ft) SW of bench mark N 292
1967, 64 m (209 ft) south of the centerline of State Highway 20, 27.13 m (89.0
ft) north of the north shore of Choctawhatchee Bay, 24.84 m (81.5 ft) NE of the
NE corner of the second house west of the bridge, 1.22 m (4.0 ft) north of the
centerline of a trail, and 0.06 m (0.2 ft) above ground level.



                         BENCH MARK STAMPING:  3 RESET 1975
                         DESIGNATION:          872 9387 TIDAL 3  1975

MONUMENTATION:           Tidal Station disk                    VM#:        10113
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BG0214
SETTING CLASSIFICATION:  Concrete bridge rail                  OPUS PID:        
LATITUDE:   30° 29.2' N (  30.48670)          LONGITUDE:  86° 15.1' W ( -86.25170)


The bench mark is a disk set in top of the concrete railing at the west corner
of the State Highway 20 bridge over Basin Bayou, 7 m (23 ft) SW of the
centerline of the highway, 1.07 m (3.5 ft) SE of the NW end of the railing, and
0.91 m (3.0 ft) above the level of the highway.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8729387                         PUBLICATION DATE:  01/23/2004
Name:       BASIN BAYOU, CHOCTAWHATCHEE BAY                   
            FL
NOAA Chart: 11388                           Latitude:   30° 29.2' N (  30.48670)
USGS Quad:  CHOCTAW BEACH                   Longitude:  86° 15.2' W ( -86.25330)


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


                         BENCH MARK STAMPING:  M 292 1967
                         DESIGNATION:          M 292

MONUMENTATION:           Bench Mark disk                       VM#:        10114
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BG2194
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   30° 29.1' N (  30.48500)          LONGITUDE:  86° 14.7' W ( -86.24500)


The bench mark is a disk set in the top of a concrete monument, 0.6 km (0.4 mi)
east of the State Highway 20 bridge over Basin Bayou, 19.20 m (63.0 ft) north of
the centerline of the highway, 17.68 m (58.0 ft) NW of the west end of a
concrete culvert, 16.46 m (54.0 ft) west of the centerline of a private
driveway, 0.91 m (3.0 ft) east of a powerline pole with a transformer, 0.61 m
(2.0 ft) west of a witness post, and  0.09 m (0.03 ft) above ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8729387                         PUBLICATION DATE:  01/23/2004
Name:       BASIN BAYOU, CHOCTAWHATCHEE BAY                   
            FL
NOAA Chart: 11388                           Latitude:   30° 29.2' N (  30.48670)
USGS Quad:  CHOCTAW BEACH                   Longitude:  86° 15.2' W ( -86.25330)


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


                         BENCH MARK STAMPING:  N 292 1967
                         DESIGNATION:          N 292

MONUMENTATION:           Bench Mark disk                       VM#:        10115
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BG2179
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   30° 29.3' N (  30.48830)          LONGITUDE:  86° 15.1' W ( -86.25170)


The bench mark is a disk set in the top of a concrete moment, 196 m (643 ft)
west of the west end of the State Highway 20 bridge over Basin Bayou, 29 m (95
ft) NW of the NW corner of a house, 20.12 m (66.0 ft) east of the centerline of
a driveway, 15.39 m (50.5 ft) west of the centerline of another driveway, 15.24
m (50.0 ft) south of the centerline of the highway, and at ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8729387                         PUBLICATION DATE:  01/23/2004
Name:       BASIN BAYOU, CHOCTAWHATCHEE BAY                   
            FL
NOAA Chart: 11388                           Latitude:   30° 29.2' N (  30.48670)
USGS Quad:  CHOCTAW BEACH                   Longitude:  86° 15.2' W ( -86.25330)


                            T I D A L   D A T U M S 


Tidal datums at BASIN BAYOU, CHOCTAWHATCHEE BAY based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           October 1977 - November 1977
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8729538 GARNIER BAYOU, SHALIMAR


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.123
     MEAN HIGH WATER                            MHW    =  0.114
     MEAN SEA LEVEL                             MSL    =  0.062
     MEAN TIDE LEVEL                            MTL    =  0.059
     MEAN LOW WATER                             MLW    =  0.004
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     North American Vertical Datum              NAVD88 = -0.048

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     9387 A 1977                                 3.163    3.049
     2 1939                                      0.870    0.756
     3 RESET 1975                                3.169    3.055
     M 292 1967                                  2.920    2.806
     N 292 1967                                  0.729    0.615


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  6

                                                                                
Station ID: 8729387                         PUBLICATION DATE:  01/23/2004
Name:       BASIN BAYOU, CHOCTAWHATCHEE BAY                   
            FL
NOAA Chart: 11388                           Latitude:   30° 29.2' N (  30.48670)
USGS Quad:  CHOCTAW BEACH                   Longitude:  86° 15.2' W ( -86.25330)


                             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 8729387 BASIN BAYOU, CHOCTAWHATCHEE BAY, FL

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services