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Bench Mark Sheet for 8726668, TAMPA, HOOKER POINT, HILLSBOROUGH 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  5

                                                                                
Station ID: 8726668                         PUBLICATION DATE:  04/01/2004
Name:       TAMPA, HOOKER POINT, HILLSBOROUGH BAY             
            FL
NOAA Chart: 11413                           Latitude:   27° 55.1' N (  27.91830)
USGS Quad:  TAMPA                           Longitude:  82° 26.7' W ( -82.44500)


To reach the tidal bench marks from the intersection of 22nd Street and Maritime
Boulevard (the entrance to Port of Tampa), proceed south along Maritime
Boulevard for 2.3 km (1.4 mi) to the Illinois Grain Corporation grain elevators
and the Richard E. Knight Pier.  The bench marks are on the Richard E. Knight
Pier and near the grain elevators.  The tide gage and staff were located on a
concrete sea wall 126 m (414 ft) SW of the grain elevators.


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


                 PRIMARY BENCH MARK STAMPING:  6668 A 1977
                         DESIGNATION:          872 6668 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6813
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7491
SETTING CLASSIFICATION:  Concrete bulkhead                     OPUS PID:        
LATITUDE:   27° 55.1' N (  27.91830)          LONGITUDE:  82° 26.7' W ( -82.44500)


The primary bench mark is a disk set in the top of the north bulkhead of the
north boat slip, 64.62 m (212.0 ft) east of the NW corner of the boat slip,
17.37 m (57.0 ft) west of the SW corner of an old grain derrick, 0.52 m (1.7 ft)
north of the outside edge of the bulkhead for the boat slip, and 0.37 m (1.2 ft)
west of the third boat cleat east of the NW corner of the boat slip.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8726668                         PUBLICATION DATE:  04/01/2004
Name:       TAMPA, HOOKER POINT, HILLSBOROUGH BAY             
            FL
NOAA Chart: 11413                           Latitude:   27° 55.1' N (  27.91830)
USGS Quad:  TAMPA                           Longitude:  82° 26.7' W ( -82.44500)


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


                         BENCH MARK STAMPING:  HP 2 1947
                         DESIGNATION:          872 6668 TIDAL HP 2

MONUMENTATION:           Tidal Station disk                    VM#:         6810
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG6074
SETTING CLASSIFICATION:  Concrete floor                        OPUS PID:        
LATITUDE:   27° 55.2' N (  27.92000)          LONGITUDE:  82° 26.6' W ( -82.44330)


The bench mark is a disk set in the concrete floor north of the Richard E.
Knight Pier, 71.32 m (234.0 ft) NE of the SW end of the pier, 6.55 m (21.5 ft)
SW of the 4th boat cleat from the SW end of the pier, and 0.88 m (2.9 ft) NW of
the SE edge of the pier.



                         BENCH MARK STAMPING:  HP 3 1947
                         DESIGNATION:          872 6668 TIDAL HP 3

MONUMENTATION:           Tidal Station disk                    VM#:         6811
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG6073
SETTING CLASSIFICATION:  Concrete floor of pier                OPUS PID:        
LATITUDE:   27° 55.2' N (  27.92000)          LONGITUDE:  82° 26.6' W ( -82.44330)


The bench mark is a disk set in the concrete floor of the Richard E. Knight
Pier, 82.30 m (270.0 ft) SW of the NE end of the pier, 19 m (63 ft) SW of the
3rd boat cleat from the NE end of the pier, and 1 m (3 ft) SE of the NW edge of
the pier.

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

                                                                                
Station ID: 8726668                         PUBLICATION DATE:  04/01/2004
Name:       TAMPA, HOOKER POINT, HILLSBOROUGH BAY             
            FL
NOAA Chart: 11413                           Latitude:   27° 55.1' N (  27.91830)
USGS Quad:  TAMPA                           Longitude:  82° 26.7' W ( -82.44500)


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


                         BENCH MARK STAMPING:  BM NO 4 RESET 1963
                         DESIGNATION:          872 6668 TIDAL 4
                         ALIAS:                872 6668 TIDAL 4 RESET

MONUMENTATION:           Tidal Station disk                    VM#:         6812
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG6071
SETTING CLASSIFICATION:  Retaining wall                        OPUS PID:        
LATITUDE:   27° 55.2' N (  27.92000)          LONGITUDE:  82° 26.5' W ( -82.44170)


The bench mark is a disk set in the top of the east end of the retaining wall on
the SE side of the inshore end of the Richard E. Knight Pier, 1.2 m (4.0 ft) SW
of the NE end of the pier, and 0.15 m (0.5 ft) NW of the SE edge of the pier.



                         BENCH MARK STAMPING:  6668 B 1977
                         DESIGNATION:          872 6668 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6814
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7490
SETTING CLASSIFICATION:  Concrete bulkhead                     OPUS PID:        
LATITUDE:   27° 55.2' N (  27.92000)          LONGITUDE:  82° 26.6' W ( -82.44330)


The bench mark is a disk set in the top of the north bulkhead of the north boat
slip, 11 m (36 ft) west of the sixth boat cleat east of the NW corner of the
boat slip, 2.44 m (8.0 ft) SW of the SE corner  of an abandoned tin building,
and 0.52 m (1.7 ft) north of the outside edge of the bulkhead for the boat slip.

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

                                                                                
Station ID: 8726668                         PUBLICATION DATE:  04/01/2004
Name:       TAMPA, HOOKER POINT, HILLSBOROUGH BAY             
            FL
NOAA Chart: 11413                           Latitude:   27° 55.1' N (  27.91830)
USGS Quad:  TAMPA                           Longitude:  82° 26.7' W ( -82.44500)


                            T I D A L   D A T U M S 


Tidal datums at TAMPA, HOOKER POINT, HILLSBOROUGH BAY based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           December 1978 - March 1979
     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   =  0.818
     MEAN HIGH WATER                            MHW    =  0.735
     North American Vertical Datum              NAVD88 =  0.504
     MEAN SEA LEVEL                             MSL    =  0.442
     MEAN TIDE LEVEL                            MTL    =  0.434
     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

     6668 A 1977                                 1.907    1.172
     HP 2 1947                                   2.567    1.832
     HP 3 1947                                   2.593    1.858
     BM NO 4 RESET 1963                          2.500    1.765
     6668 B 1977                                 1.910    1.175


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

                                                                                
Station ID: 8726668                         PUBLICATION DATE:  04/01/2004
Name:       TAMPA, HOOKER POINT, HILLSBOROUGH BAY             
            FL
NOAA Chart: 11413                           Latitude:   27° 55.1' N (  27.91830)
USGS Quad:  TAMPA                           Longitude:  82° 26.7' W ( -82.44500)


                             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 8726668 TAMPA, HOOKER POINT, HILLSBOROUGH BAY, FL

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