U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 03/19/1991
Station ID: 8726319 SUPERCEDED DATE: 04/21/2003
Name: SEABREEZE POINT, TERRA CEIA BAY
FLORIDA
NOAA Chart: 11414 Latitude: 27° 34.2' N
USGS Quad: PALMETTO Longitude: 82° 34.3' W
To reach the tidal bench marks go to the intersection of Bayshore Drive and U.S.
Route 19 in Rubonia, Florida. The tide gage and staff were on a wood dock on
Terra Ceia Bay near the bridge supporting U.S. Route 19 over the bay, and the
bench marks are along U.S. Route 19 and the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6319 A 1977
MONUMENTATION: Survey Disk VM#: 6203
AGENCY: PID#: AG7616
SETTING CLASSIFICATION: Concrete Post
The bench mark is set in the top of a concrete post projecting 0.8 foot (0.2 m)
above ground level, 70.0 feet (21.3 m) NE of the centerline of the north- bound
lane of U.S. Route 19, 21.0 feet (6.4 m) SE of the centerline of Bayshore Drive,
and 3.5 feet (1.1 m) north of a power pole with a witness post.
BENCH MARK STAMPING: NO STAMPING 1
MONUMENTATION: Survey Disk VM#: 6204
AGENCY: PID#: AG7615
SETTING CLASSIFICATION: Concrete Seawall
The bench mark is set flush in a concrete seawall, 0.12 miles (0.19 km) south of
bench mark 6319 A 1977, 71.0 feet (21.6 m) west of the west corner of the U.S.
Route 19 Southbound bridge over Terra Ceia Bay, and 49.0 feet (14.9 m) north of
a power pole located at the SW corner of the seawall.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 03/19/1991
Station ID: 8726319 SUPERCEDED DATE: 04/21/2003
Name: SEABREEZE POINT, TERRA CEIA BAY
FLORIDA
NOAA Chart: 11414 Latitude: 27° 34.2' N
USGS Quad: PALMETTO Longitude: 82° 34.3' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: SRD NOK
MONUMENTATION: Survey Disk VM#: 6205
AGENCY: PID#: AG7614
SETTING CLASSIFICATION: Concrete Bridge Wingwall
The bench mark is set flush in the NW corner of the U.S. Route 19 bridge over
Terra Ceia Bay, 24.0 feet (7.3 m) SW of the centerline of the southbound lane,
and 21.0 feet (6.4 m) SE of Bench mark MANATEE CO.
BENCH MARK STAMPING: SRD N 1
MONUMENTATION: Survey Disk VM#: 6206
AGENCY: PID#: AG5189
SETTING CLASSIFICATION: Concrete Rail
The bench mark is set flush on top of the concrete rail on the SE corner of the
U.S. Route 19 bridge over Terra Ceia Bay, 22.7 feet (6.9 m) east of the
centerline of the northbound lane, and 1.7 feet (0.5 m) north of the south end
of the rail.
BENCH MARK STAMPING: SRD N 2
MONUMENTATION: Survey Disk VM#: 6207
AGENCY: PID#: AG5190
SETTING CLASSIFICATION: Concrete Rail
The bench mark is set flush on top of a concrete rail on the NE corner of the
U.S. Route 19 bridge over the bay, 22.7 feet (6.9 m) east of the center line of
the north bound lane, and 1.7 feet (0.5 m) south of the north end of the rail.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 03/19/1991
Station ID: 8726319 SUPERCEDED DATE: 04/21/2003
Name: SEABREEZE POINT, TERRA CEIA BAY
FLORIDA
NOAA Chart: 11414 Latitude: 27° 34.2' N
USGS Quad: PALMETTO Longitude: 82° 34.3' W
T I D A L D A T U M S
Tidal datums at SEABREEZE POINT, TERRA CEIA BAY based on:
LENGTH OF SERIES: 5 MONTHS
TIME PERIOD: MAY-SEPTEMBER 1977
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8726384 PORT MANATEE
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (06/02/1977) = 3.25
MEAN HIGHER HIGH WATER MHHW = 2.21
MEAN HIGH WATER MHW = 1.95
MEAN TIDE LEVEL MTL = 1.11
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 0.77
MEAN LOW WATER MLW = 0.27
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (04/23/1977) = -0.14
* NGVD reference based on adjustment of 1973 and NOS levels of 1977.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
6319 A 1977 5.43 3.48
NO STAMPING 1 3.94 1.99
SRD NOK 14.76 12.81
SRD N 1 17.35 15.40
SRD N 2 17.40 15.45
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 03/19/1991
Station ID: 8726319 SUPERCEDED DATE: 04/21/2003
Name: SEABREEZE POINT, TERRA CEIA BAY
FLORIDA
NOAA Chart: 11414 Latitude: 27° 34.2' N
USGS Quad: PALMETTO Longitude: 82° 34.3' W
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 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.