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.