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Bench Mark Sheet for 8728786, ELEVEN MILE, ST. VINCENT SOUND

Superseded Epoch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Small blue map location marker Unpublished bench mark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  8

                                                                                
Station ID: 8728786                         PUBLICATION DATE:  03/10/2011
Name:       ELEVEN MILE, ST. VINCENT SOUND                    
            FL
NOAA Chart: 11401                           Latitude:   29° 42.4' N (  29.70670)
USGS Quad:  INDIAN PASS                     Longitude:  85°  9.2' W ( -85.15330)


To reach the tidal bench marks from the Franklin County Courthouse in
Appalachicola proceed west on U.S. Highway 98 for 13.04 km (8.1 mi) to the
Y-junction of County Road C-30, then west on County Road C-30 for 4.83 km (3.0
mi) to the dirt drive to the Eleven Mile Fishery, then south on the drive for
0.32 km (0.2 mi) to the fish house.  The bench marks are along County Road C-30
and the drive to the fish house.  The tide gage and staff were located at the
Eleven Mile Fishery dock.


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


                 PRIMARY BENCH MARK STAMPING:  8786 A 1977
                         DESIGNATION:          872 8786 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9884
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AS0872
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   29° 42.4' N (  29.70670)          LONGITUDE:  85°  9.2' W ( -85.15330)


The primary bench mark is a disk located 17.68 m (58.0 ft) SE of the NE corner
of the easterly dock, 7.01 m (23.0 ft) ENE of the centerline the dirt road, 1.98
m (6.5 ft) SE of utility pole No. 56X 2661R, and 0.61 m (2.0 ft) west of a
witness post.  The bench mark is set at ground level, crimped to the top of a
copper-clad steel rod driven 14.63 m (48.0 ft), and encased in a PVC pipe and
concrete kick-block.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  8

                                                                                
Station ID: 8728786                         PUBLICATION DATE:  03/10/2011
Name:       ELEVEN MILE, ST. VINCENT SOUND                    
            FL
NOAA Chart: 11401                           Latitude:   29° 42.4' N (  29.70670)
USGS Quad:  INDIAN PASS                     Longitude:  85°  9.2' W ( -85.15330)


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


                         BENCH MARK STAMPING:  8786 C 1977
                         DESIGNATION:          872 8786 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9886
AGENCY:                  Florida Department of Natural Resources
                         (FLDNR)                               IDB PID#:  AS0870
SETTING CLASSIFICATION:  Concrete Post                         OPUS PID:        
LATITUDE:   29° 42.6' N (  29.71000)          LONGITUDE:  85°  9.3' W ( -85.15500)


The bench mark is a disk set in the top of a concrete monument, 90.22 m (296.0
ft) north of bench mark 8786 B 1977, 12.80 m (42.0 ft) SE of powerline pole No.
56X 1859R, 10.36 m (34.0 ft) NW of a 0.46 m (1.5 ft) diameter palm tree, 7.92 m
(26.0 ft) ENE of the centerline of the dirt road drive, 1.22 m (4.0 ft) WNW of a
witness post, and at ground level.



                         BENCH MARK STAMPING:  8786 E 1977
                         DESIGNATION:          872 8786 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         9888
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AS0520
SETTING CLASSIFICATION:  Concrete Post                         OPUS PID:        
LATITUDE:   29° 42.6' N (  29.71000)          LONGITUDE:  85°  9.2' W ( -85.15333)


The bench mark is a disk set in a concrete monument, 58.83 m (193.0 ft) ENE of
the junction of the dirt drive and County Road C-30, 11.77 m (38.6 ft) NNW of
the centerline of County Road C-30, 6.71 m (22.0 ft) SE of a powerline pole,
0.49 m (1.6 ft) SE of a witness post, and at ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  8

                                                                                
Station ID: 8728786                         PUBLICATION DATE:  03/10/2011
Name:       ELEVEN MILE, ST. VINCENT SOUND                    
            FL
NOAA Chart: 11401                           Latitude:   29° 42.4' N (  29.70670)
USGS Quad:  INDIAN PASS                     Longitude:  85°  9.2' W ( -85.15330)


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


                         BENCH MARK STAMPING:  Y 295 1967
                         DESIGNATION:          Y 295

MONUMENTATION:           Bench Mark disk                       VM#:        19030
AGENCY:                  US Coast & Geodetic Survey
                         (USC&GS)                                 IDB PID#:  AS0120
SETTING CLASSIFICATION:  Copper-Clad Steel Rod                 OPUS PID:        
LATITUDE:   29° 43.2' N (  29.72000)          LONGITUDE:  85°  6.5' W ( -85.10833)


The bench mark is a disk located in the Y junction formed by the U.S. Hwy 98 and
State Hwy S 30, 31.24 m (102.5 ft) SW of the center line of Hwy 98, 16.61 m
(54.5 ft) north of the center line of Hwy S 30, 16.46 m (54.0 ft) west of the
center line of a connecting road in line with a row of large power line poles,
0.18 m (0.6 ft) south of a metal witness post, about level with the state
highway, and 1.22 m (4.0 ft) below the level of the U.S. highway.  The bench
mark is a disk on the top of a copper coated steel rod projecting 0.09 m (0.3
ft) above the level of the ground and protected by a 4-inch metal pipe which
projects 0.18 m (0.6 ft) above the level of the ground.  The rod was driven to a
depth of 18.90 m (62.0 ft).  NOTE:  Witness post destroyed by machinery clearing
power line right-of-way.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  8

                                                                                
Station ID: 8728786                         PUBLICATION DATE:  03/10/2011
Name:       ELEVEN MILE, ST. VINCENT SOUND                    
            FL
NOAA Chart: 11401                           Latitude:   29° 42.4' N (  29.70670)
USGS Quad:  INDIAN PASS                     Longitude:  85°  9.2' W ( -85.15330)


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


                         BENCH MARK STAMPING:  G 689 2007
                         DESIGNATION:          G 689

MONUMENTATION:           Survey disk                           VM#:        19031
AGENCY:                  Florida Dept. of Environmental
                         Protection (FLDEP)                    IDB PID#:        
SETTING CLASSIFICATION:  Concrete Head Wall                    OPUS PID:        
LATITUDE:   29° 42.9' N (  29.71500)          LONGITUDE:  85°  7.4' W ( -85.12333)


The bench mark is a disk set flush in the top of a concrete headwall of a
36-inch pipe culvert beneath County Road C-30 and 0.61 m (2.0 ft) below the
level of the C-30, located 7.68 m (25.2 ft) SSE of the centerline of county road
C-30, 2.56 m (8.4 ft) west of the east end of the headwall, 1.16 m (3.8 ft) east
of a carsonite witness post, and 1.13 m (3.7 ft) east of the west end of the
headwall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  8

                                                                                
Station ID: 8728786                         PUBLICATION DATE:  03/10/2011
Name:       ELEVEN MILE, ST. VINCENT SOUND                    
            FL
NOAA Chart: 11401                           Latitude:   29° 42.4' N (  29.70670)
USGS Quad:  INDIAN PASS                     Longitude:  85°  9.2' W ( -85.15330)


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


                         BENCH MARK STAMPING:  F 689 2007
                         DESIGNATION:          F 689

MONUMENTATION:           Flange-encased Rod                    VM#:        19032
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod in sleeve         OPUS PID:        
LATITUDE:   29° 42.8' N (  29.71333)          LONGITUDE:  85°  8.3' W ( -85.13833)


The bench mark is a flange encase rod located 21.92 m (71.9 ft) SW of the top
center of a 36-inch pipe culvert, 14.17 m (46.5 ft) south of the centerline of
County Road C-30, 7.50 m (24.6 ft) west of the centerline of 10 Mile Road, and
0.70 m (2.3 ft) east of a carsonite witness post.  The datum point is set flush
with the ground and 0.91 m (3.0 ft) below the level of County Road C-30, being
the top of a stainless steel rod driven to refusal at a depth of 21.64 m (71.0
ft), in a sleeve, and recessed 0.15 m (0.5 ft) below the logo cap.  NOTE:  A
magnet was placed inside of the NGS logo cap.        



                         BENCH MARK STAMPING:  8786 F 2007
                         DESIGNATION:          872 8786 F TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        19033
AGENCY:                  Florida Dept. of Environmental
                         Protection (FLDEP)                    IDB PID#:        
SETTING CLASSIFICATION:  Culvert Head Wall                     OPUS PID#: DM4905
LATITUDE:   29° 42.6' N (  29.71000)          LONGITUDE:  85°  9.4' W ( -85.15667)


The bench mark is a disk set flush in the top of a concrete headwall for twin
48-inch pipe culverts beneath County Road C-30, located 16.00 m (52.5 ft) NNW of
bench mark 8786 G 2007, 7.68 m (25.2 ft) NNW of the centerline of C-30, 3.47 m
(11.4 ft) WSW of a carsonite witness post, and 0.61 m (2.0 ft) below the level
of the road.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  8

                                                                                
Station ID: 8728786                         PUBLICATION DATE:  03/10/2011
Name:       ELEVEN MILE, ST. VINCENT SOUND                    
            FL
NOAA Chart: 11401                           Latitude:   29° 42.4' N (  29.70670)
USGS Quad:  INDIAN PASS                     Longitude:  85°  9.2' W ( -85.15330)


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


                         BENCH MARK STAMPING:  8786 G 1977
                         DESIGNATION:          872 8786 G TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        19034
AGENCY:                  Florida Dept. of Environmental
                         Protection (FLDEP)                    IDB PID#:        
SETTING CLASSIFICATION:  Culvert Head Wall                     OPUS PID:        
LATITUDE:   29° 42.6' N (  29.71000)          LONGITUDE:  85°  9.3' W ( -85.15500)


The bench mark is a disk set flush in the top of a concrete headwall for twin
48-inch pipe culverts beneath C-30, located 16.00 m (52.5 ft) SSE of bench mark
8786 F 2007, 8.32 m (27.3 ft) SSE of the centerline of the county road, 3.57 m
(11.7 ft) NE of a carsonite witness post, and 0.30 m (1.0 ft) below the level of
the road.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  8

                                                                                
Station ID: 8728786                         PUBLICATION DATE:  03/10/2011
Name:       ELEVEN MILE, ST. VINCENT SOUND                    
            FL
NOAA Chart: 11401                           Latitude:   29° 42.4' N (  29.70670)
USGS Quad:  INDIAN PASS                     Longitude:  85°  9.2' W ( -85.15330)


                            T I D A L   D A T U M S 


Tidal datums at ELEVEN MILE, ST. VINCENT SOUND based on:

     LENGTH OF SERIES:      6 MONTHS
     TIME PERIOD:           December 1977 - May 1978
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8729840 PENSACOLA, PENSACOLA BAY


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.509
     MEAN HIGH WATER                            MHW    =  0.468
     MEAN TIDE LEVEL                            MTL    =  0.297
     North American Vertical Datum              NAVD88 =  0.279
     MEAN SEA LEVEL                             MSL    =  0.274
     MEAN LOW WATER                             MLW    =  0.126
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     8786 A 1977                                 0.998    0.530
     8786 C 1977                                 1.710    1.242
     8786 E 1977                                 3.064    2.596
     Y 295 1967                                  4.434    3.966
     G 689 2007                                  4.685    4.217
     F 689 2007                                  4.340    3.872
     8786 F 2007                                 2.451    1.983
     8786 G 1977                                 2.508    2.040


Foot Notes:

Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality control
standards for Second Order, Class 1 leveling.  It is advised that a confirmation
set of levels be established for bench marks 8786 F 2007, 8786 G 1977, F 689
2007, G 689 2007, and Y 295 1967 to verify height differences before using tidal
bench mark elevation information.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  8

                                                                                
Station ID: 8728786                         PUBLICATION DATE:  03/10/2011
Name:       ELEVEN MILE, ST. VINCENT SOUND                    
            FL
NOAA Chart: 11401                           Latitude:   29° 42.4' N (  29.70670)
USGS Quad:  INDIAN PASS                     Longitude:  85°  9.2' W ( -85.15330)


                             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 8728786 ELEVEN MILE, ST. VINCENT SOUND,

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