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Bench Mark Sheet for 8725809, MANASOTA 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  7

                                                                                
Station ID: 8725809                         PUBLICATION DATE:  06/02/2011
Name:       MANASOTA                                          
            FL
NOAA Chart: 11424                           Latitude:   27°  0.7' N (  27.01170)
USGS Quad:  VENICE                          Longitude:  82° 24.6' W ( -82.41000)


To reach the tidal bench marks from the junction of US Highway 41 and State Road
775 south of Venice, proceed south on State Road 775 for 3.5 km (2.2 mi) to
junction of Manasota Beach Road, then turn right and proceed west on Manasota
Beach Road for 2.6 km (1.6 mi) to the bridge over the Intracoastal Waterway. 
The bench marks are located along Manasota Beach Road and near its' intersection
with Manasota Key Road.  The tide gage and staff were located SSW of the west
end of the bridge, on a wood dock on the east side of a boat ramp.


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


                 PRIMARY BENCH MARK STAMPING:  5809 F 1977
                         DESIGNATION:          872 5809 F TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6081
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7851
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   27°  0.6' N (  27.01000)          LONGITUDE:  82° 24.7' W ( -82.41170)


The primary bench mark is a disk bearing 10.65 m (35 ft) SW of the centerline of
Manasota Key Road, 10.97 m (36 ft) NW of the extended centerline of Manasota
Beach road, and 0.76 m (2.5 ft) SW of power pole 5-2344-1561-04.  The bench mark
is set atop a copper-coated steel rod driven to refusal and encased in a PVC
pipe that is flush with the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                                                
Station ID: 8725809                         PUBLICATION DATE:  06/02/2011
Name:       MANASOTA                                          
            FL
NOAA Chart: 11424                           Latitude:   27°  0.7' N (  27.01170)
USGS Quad:  VENICE                          Longitude:  82° 24.6' W ( -82.41000)


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


                         BENCH MARK STAMPING:  5809 E 1977
                         DESIGNATION:          872 5809 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6080
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7848
SETTING CLASSIFICATION:  Concrete storm drain                  OPUS PID:        
LATITUDE:   27°  0.6' N (  27.01000)          LONGITUDE:  82° 24.7' W ( -82.41170)


The bench mark is a disk set in the top of a concrete storm drain,  bearing 6.25
m (20.5 ft) NW of the centerline of Manasota Beach Road, 29.87 m (98 ft) NE of
the centerline of Manasota Key Road, and about 91.44 m (300 ft) SW of the west
corner of the bridge over the intra-coastal waterway.



                         BENCH MARK STAMPING:  17 84 C14
                         DESIGNATION:          17 84 C14

MONUMENTATION:           Survey disk                           VM#:        19916
AGENCY:                  Florida Dept. of Environmental
                         Protection (FLDEP)                    IDB PID#:  DL2727
SETTING CLASSIFICATION:  Round concrete monument               OPUS PID:        
LATITUDE:   26° 59.5' N (  26.99222)          LONGITUDE:  82° 24.2' W ( -82.40253)


The bench mark is a disk set in the top of a round concrete monument, recessed
0.2 m (0.6 ft) below the level of the ground and about 0.2 m (0.5 ft) below the
level of Manasota Key Road, 30.7 m (100.5 ft) NW of the approximate centerline
of a driveway at 7830 Manasota Key Road, 11.0 m (36.0 ft) NW of a power pole
number 5-2343-7828-00, 4.4 m (14.3 ft) SW of the approximate centerline of
Manasota Key Road and 1.6 m (5.2 ft) NE of a carsonite witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                                                
Station ID: 8725809                         PUBLICATION DATE:  06/02/2011
Name:       MANASOTA                                          
            FL
NOAA Chart: 11424                           Latitude:   27°  0.7' N (  27.01170)
USGS Quad:  VENICE                          Longitude:  82° 24.6' W ( -82.41000)


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


                         BENCH MARK STAMPING:  E 702 2007
                         DESIGNATION:          E 702

MONUMENTATION:           Flange-encased Rod                    VM#:        19917
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  DL2728
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   27°  0.1' N (  27.00178)          LONGITUDE:  82° 24.4' W ( -82.40697)


The bench mark is a stainless steel rod located 8.8 M (29.0 ft) NE of the
approximate centerline of Manasota Key Road, 3.4 m (11.0 ft) SE of the
approximate centerline of a driveway at 8210 Manasota Key Road, and 0.5 m (1.8
ft) SW of a carsonite witness post.  The bench mark is a stainless steel rod
driven to refusal at a depth of 8.0 m (26.4 ft) with an NGS logo cap (the datum
point recessed 0.1 M (0.3 f)t (0.1 m) below the level of the NGS logo cap) flush
with the ground and level with Manasota Key Road.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                                                
Station ID: 8725809                         PUBLICATION DATE:  06/02/2011
Name:       MANASOTA                                          
            FL
NOAA Chart: 11424                           Latitude:   27°  0.7' N (  27.01170)
USGS Quad:  VENICE                          Longitude:  82° 24.6' W ( -82.41000)


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


                         BENCH MARK STAMPING:  SAR 24
                         DESIGNATION:          SAR 24

MONUMENTATION:           Survey disk                           VM#:        19918
AGENCY:                  Florida Department of Transportation
                         (FLDT)                                IDB PID#:  AG7846
SETTING CLASSIFICATION:  Bridge curb                           OPUS PID:        
LATITUDE:   27°  0.7' N (  27.01225)          LONGITUDE:  82° 24.5' W ( -82.40889)


The bench mark is a disk set in the bridge curbing, 1.37 m (4.5 ft) NW of the
east corner of the bridge, 4.11 m (13.5 ft) SE of the centerline of the road,
and 0.03 m (1 ft) above centerline of road.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                                                
Station ID: 8725809                         PUBLICATION DATE:  06/02/2011
Name:       MANASOTA                                          
            FL
NOAA Chart: 11424                           Latitude:   27°  0.7' N (  27.01170)
USGS Quad:  VENICE                          Longitude:  82° 24.6' W ( -82.41000)


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


                         BENCH MARK STAMPING:  SAR 25
                         DESIGNATION:          SAR 25

MONUMENTATION:           Survey disk                           VM#:        19919
AGENCY:                  Florida Department of Transportation
                         (FLDT)                                IDB PID#:  AG7847
SETTING CLASSIFICATION:  Bridge curb                           OPUS PID:        
LATITUDE:   27°  0.7' N (  27.01133)          LONGITUDE:  82° 24.6' W ( -82.41050)


The bench mark is a disk set in the bridge curbing, 1.31 m (4.3 ft) NW of the
south corner of the bridge, 3.81 m (12.5 ft) SE of the centerline of the road,
and 0.03 m (1 ft) above centerline of road.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                                                
Station ID: 8725809                         PUBLICATION DATE:  06/02/2011
Name:       MANASOTA                                          
            FL
NOAA Chart: 11424                           Latitude:   27°  0.7' N (  27.01170)
USGS Quad:  VENICE                          Longitude:  82° 24.6' W ( -82.41000)


                            T I D A L   D A T U M S 


Tidal datums at MANASOTA based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           November 1977 - January 1978
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8725744 PUNTA GORDA


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.512
     MEAN HIGH WATER                            MHW    =  0.424
     North American Vertical Datum              NAVD88 =  0.410
     MEAN SEA LEVEL                             MSL    =  0.266
     MEAN TIDE LEVEL                            MTL    =  0.263
     MEAN LOW WATER                             MLW    =  0.103
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     5809 F 1977                                 3.449    3.025
     5809 E 1977                                 2.565    2.141
     17 84 C14                                   1.690    1.266
     E 702 2007                                  1.566    1.141
     SAR 24                                      4.485    4.061
     SAR 25                                      8.413    7.989


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 17 84 C14, E 702 2007, SAR 24, and
SAR 25 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  7 of  7

                                                                                
Station ID: 8725809                         PUBLICATION DATE:  06/02/2011
Name:       MANASOTA                                          
            FL
NOAA Chart: 11424                           Latitude:   27°  0.7' N (  27.01170)
USGS Quad:  VENICE                          Longitude:  82° 24.6' W ( -82.41000)


                             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 8725809 MANASOTA, FL

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