Bench Mark Sheet for 8726639, TAMPA, BALLAST POINT 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  5

                                                                                
Station ID: 8726639                         PUBLICATION DATE:  06/16/2004
Name:       TAMPA, BALLAST POINT                              
            FL
NOAA Chart: 11413                           Latitude:   27° 53.4' N (  27.89000)
USGS Quad:  TAMPA                           Longitude:  82° 28.8' W ( -82.48000)


To reach the tidal bench marks at Ballast Point Pier in Tampa, proceed from the
intersection of Bayshore Boulevard and Interbay Boulevard along the west
shoreline of Hillsborough Bay, SE along Interbay Boulevard for 0.8 km (0.5 mi)
to the intersection of Interbay Boulevard and West Ballast Point Road (block
2300), then go east along West Ballast Point Road to the Ballast Point Pier. 
The bench marks are in the vicinity of the sea wall and the parking lot area on
the eastern side of Interbay Boulevard.  The tide gage and staff were located
midway on the pier at the east end of a shelter.


                         T I D A L   B E N C H   M A R K S
                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8726639                         PUBLICATION DATE:  06/16/2004
Name:       TAMPA, BALLAST POINT                              
            FL
NOAA Chart: 11413                           Latitude:   27° 53.4' N (  27.89000)
USGS Quad:  TAMPA                           Longitude:  82° 28.8' W ( -82.48000)


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


                 PRIMARY BENCH MARK STAMPING:  BP 1 1948
                         DESIGNATION:          872 6639 TIDAL BP 1
                         ALIAS:                TIDAL BP 1 STA III 43

MONUMENTATION:           Tidal Station disk                    VM#:        10687
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG6003
SETTING CLASSIFICATION:  Square concrete cross-tie             OPUS PID:        
LATITUDE:   27° 53.3' N (  27.88830)          LONGITUDE:  82° 28.8' W ( -82.48000)


The primary bench mark is a disk set in the top of a 0.3 m (1 ft) square
concrete cross-tie on the Ballast Point Recreation Pier at the NW corner of a
shelter midway on the pier, at the west end of the steps leading down to the
small boat landing on the north side of the pier, 0.3 m (1 ft) south of the
north end of the cross-tie support, 0.18 m (0.6 ft) north of the NW leg that
supports the shelter roof, and 0.3 m (1 ft) below the level of the pier floor.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                                                
Station ID: 8726639                         PUBLICATION DATE:  06/16/2004
Name:       TAMPA, BALLAST POINT                              
            FL
NOAA Chart: 11413                           Latitude:   27° 53.4' N (  27.89000)
USGS Quad:  TAMPA                           Longitude:  82° 28.8' W ( -82.48000)


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


                         BENCH MARK STAMPING:  BP 3 1948
                         DESIGNATION:          872 6639 TIDAL BP 3
                         ALIAS:                TIDAL BP 3 STA III 43

MONUMENTATION:           Tidal Station disk                    VM#:        10688
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG6004
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   27° 53.3' N (  27.88830)          LONGITUDE:  82° 28.8' W ( -82.48000)


The bench mark is a disk set in the top of the NW end of the concrete sea wall
that projects NW from the NW corner of the main building located at the shore
end of the Ballast Point Recreation Pier, 22.40 m (73.5 ft) NE of the NE corner
of the refreshment stand, 16.76 m (55.0 ft) NW of the NW corner of the pier, and
15.85 m (52.0 ft) SE of the SE edge of a boat ramp.



                         BENCH MARK STAMPING:  NO 1 1975
                         DESIGNATION:          872 6639 TIDAL 1
                         ALIAS:                 

MONUMENTATION:           Tidal Station disk                    VM#:        10689
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7463
SETTING CLASSIFICATION:  Concrete slab                         OPUS PID:        
LATITUDE:   27° 53.4' N (  27.89000)          LONGITUDE:  82° 28.8' W ( -82.48000)


The bench mark is a disk set in the concrete slab for the picnic table shelter
located south of the park gazebo, 49 m (160 ft) SW of the SW corner of the bait
and sandwich shop, and 0.98 m (3.2 ft) NNW of the SE corner of the floor.



                         BENCH MARK STAMPING:  NO 2 1975
                         DESIGNATION:          872 6639 TIDAL 2
                         ALIAS:                 

MONUMENTATION:           Tidal Station disk                    VM#:        10690
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG6384
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   27° 53.3' N (  27.88830)          LONGITUDE:  82° 28.9' W ( -82.48170)


The bench mark is a disk located 43 m (140 ft) WSW of bench mark NO 1 1975, 8.38
m (27.5 ft) east of the centerline of Interbay Boulevard, and 0.55 m (1.8 ft)
north of power pole #24442-39226.  The bench mark is crimped to the top of a
copper-clad steel rod driven to refusal, encased in a PVC pipe projecting 6 cm
(0.2 ft) and surrounded by a concrete kickblock.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                                                
Station ID: 8726639                         PUBLICATION DATE:  06/16/2004
Name:       TAMPA, BALLAST POINT                              
            FL
NOAA Chart: 11413                           Latitude:   27° 53.4' N (  27.89000)
USGS Quad:  TAMPA                           Longitude:  82° 28.8' W ( -82.48000)


                            T I D A L   D A T U M S 


Tidal datums at TAMPA, BALLAST POINT based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           July 1996 - September 1996
     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   =  0.830
     MEAN HIGH WATER                            MHW    =  0.737
     North American Vertical Datum              NAVD88 =  0.538
     MEAN SEA LEVEL                             MSL    =  0.446
     MEAN TIDE LEVEL                            MTL    =  0.435
     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

     BP 1 1948                                   2.227    1.490
     BP 3 1948                                   1.683    0.946
     NO 1 1975                                   2.118    1.381
     NO 2 1975                                   2.145    1.408


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

                                                                                
Station ID: 8726639                         PUBLICATION DATE:  06/16/2004
Name:       TAMPA, BALLAST POINT                              
            FL
NOAA Chart: 11413                           Latitude:   27° 53.4' N (  27.89000)
USGS Quad:  TAMPA                           Longitude:  82° 28.8' W ( -82.48000)


                             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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