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Bench Mark Sheet for 8726696, PALM RIVER ENTRANCE 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  4

                                                                                
Station ID: 8726696                         PUBLICATION DATE:  04/25/2005
Name:       PALM RIVER ENTRANCE                               
            FL
NOAA Chart: 11413                           Latitude:   27° 56.8' N (  27.94670)
USGS Quad:  TAMPA                           Longitude:  82° 24.1' W ( -82.40170)


To reach the tidal bench marks from the intersection of U.S. Highway 41 (50th
Street) and State Highway 60 (South Crosstown Expressway) in Tampa, proceed
south on U.S. Highway 41 for 0.5 km (0.3 mi) to the north end of the bridge over
Palm River.  The bench marks are located at the north end of the bridge and at
the intersection of U.S. Highway 41 and State Highway 60.  The tide gage and
staff were located on a small dock just east of the NE corner of the bridge.


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


                 PRIMARY BENCH MARK STAMPING:  6696 A 1977
                         DESIGNATION:          872 6696 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         7521
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7541
SETTING CLASSIFICATION:  Bridge abutment                       OPUS PID:        
LATITUDE:   27° 56.8' N (  27.94670)          LONGITUDE:  82° 24.1' W ( -82.40170)


The primary bench mark is a disk set in the NE abutment for the northbound lane
of the bridge, 6.86 m (22.5 ft) east of the centerline of the northbound lane,
and 0.2 m (0.5 ft) south of the NE corner of the bridge.



                         BENCH MARK STAMPING:  6696 D
                         DESIGNATION:          872 6696 D TIDAL FLDT

MONUMENTATION:           Bench Mark disk                       VM#:         7522
AGENCY:                  Florida Department of Transportation
                         (FLDT)                                IDB PID#:  AG7542
SETTING CLASSIFICATION:  Concrete bridge rail                  OPUS PID:        
LATITUDE:   27° 56.8' N (  27.94670)          LONGITUDE:  82° 24.1' W ( -82.40170)


The bench mark is a disk set in the top of the concrete rail at the NW corner of
the southbound lanes of the bridge, 6 m (20 ft) west of the centerline of the
southbound lane, 0.15 m (0.5 ft) south of the north end of the rail, and 1 m (3
ft) above road level.

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

                                                                                
Station ID: 8726696                         PUBLICATION DATE:  04/25/2005
Name:       PALM RIVER ENTRANCE                               
            FL
NOAA Chart: 11413                           Latitude:   27° 56.8' N (  27.94670)
USGS Quad:  TAMPA                           Longitude:  82° 24.1' W ( -82.40170)


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


                         BENCH MARK STAMPING:  6696 E
                         DESIGNATION:          872 6696 E TIDAL FLDT

MONUMENTATION:           Bench Mark disk                       VM#:         7523
AGENCY:                  Florida Department of Transportation
                         (FLDT)                                IDB PID#:  AG7543
SETTING CLASSIFICATION:  Bridge abutment                       OPUS PID:        
LATITUDE:   27° 56.8' N (  27.94670)          LONGITUDE:  82° 24.1' W ( -82.40170)


The bench mark is set in the top of the north abutment for the southbound lanes
of the bridge, 6.74 m (22.1 ft) west of the centerline of the southbound lane,
and 0.64 m (2.1 ft) west of the bridge railing.



                         BENCH MARK STAMPING:  6696 H
                         DESIGNATION:          872 6696 H TIDAL FLDT

MONUMENTATION:           Bench Mark disk                       VM#:         7524
AGENCY:                  Florida Department of Transportation
                         (FLDT)                                IDB PID#:  AG7540
SETTING CLASSIFICATION:  Concrete bridge rail                  OPUS PID:        
LATITUDE:   27° 56.7' N (  27.94500)          LONGITUDE:  82° 24.1' W ( -82.40170)


The bench mark is a disk set in the top of the concrete rail at the SE corner of
the northbound bridge, 5.94 m (19.5 ft) east of the centerline of the northbound
lane, 0.15 m (0.5 ft) north of the south end of the rail, and 1 m (3 ft) above
the level of the highway.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                                                
Station ID: 8726696                         PUBLICATION DATE:  04/25/2005
Name:       PALM RIVER ENTRANCE                               
            FL
NOAA Chart: 11413                           Latitude:   27° 56.8' N (  27.94670)
USGS Quad:  TAMPA                           Longitude:  82° 24.1' W ( -82.40170)


                            T I D A L   D A T U M S 


Tidal datums at PALM RIVER ENTRANCE based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           March 1977 - March 1977
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8726520 ST. PETERSBURG, TAMPA BAY


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.826
     MEAN HIGH WATER                            MHW    =  0.755
     North American Vertical Datum              NAVD88 =  0.496
     MEAN TIDE LEVEL                            MTL    =  0.444
     MEAN SEA LEVEL                             MSL    =  0.443
     MEAN LOW WATER                             MLW    =  0.133
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     6696 A 1977                                 4.994    4.239
     6696 D                                      5.951    5.196
     6696 E                                      4.995    4.240
     6696 H                                      4.698    3.943


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

                                                                                
Station ID: 8726696                         PUBLICATION DATE:  04/25/2005
Name:       PALM RIVER ENTRANCE                               
            FL
NOAA Chart: 11413                           Latitude:   27° 56.8' N (  27.94670)
USGS Quad:  TAMPA                           Longitude:  82° 24.1' W ( -82.40170)


                             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 8726696 PALM RIVER ENTRANCE, FL

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