U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 09/14/1990
Station ID: 8726727 SUPERCEDED DATE: 04/21/2003
Name: SWEET WATER CREEK, OLD TAMPA BAY
FLORIDA
NOAA Chart: 11413 Latitude: 27° 58.7' N
USGS Quad: GANDY BRIDGE Longitude: 82° 33.7' W
To reach the tidal bench marks from the intersection of Eisenhower Boulevard
(State Road 589) and State Highway 60 in Tampa, proceed 1.0 mile (1.6 km) north
on Eisenhower Boulevard to Dana Shores Drive, then 1.0 mile (1.6 km) NW on Dana
Shores Drive to the Ginger Cove Apartment Complex. The bench marks are on the
grounds of the apartment complex. The tide gage and staff were at the boat ramp
of the apartment complex.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 6727 A 1976
MONUMENTATION: Survey Disk VM#: 7540
AGENCY: PID#: AG7586
SETTING CLASSIFICATION: Concrete Sea Wall
The bench mark is set in the top of the south end of the sea wall at the SW
corner of the Ginger Cove Apartment Complex, 68.6 feet (20.9 m) NW of Bench Mark
6727 B 1976, 15 feet (5 m) north of the centerline of the boat ramp, 1.3 feet
(0.4 m) north of the south end of the sea wall, and 3 feet (1 m) above the boat
ramp.
BENCH MARK STAMPING: 6727 B 1976
MONUMENTATION: Survey Disk VM#: 7541
AGENCY: PID#: AG7585
SETTING CLASSIFICATION: Concrete Sea Wall
The bench mark is set in the sea wall at the SW corner of the apartment complex,
71 feet (22 m) SE of the SW corner of the apartment leasing office and
clubhouse, 43 feet (13 m) east of the west end of the sea wall, 34.5 feet (60.5
m) south of the centerline of the drive to the boat ramp, and 31 feet (9 m)
west of a fence.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 09/14/1990
Station ID: 8726727 SUPERCEDED DATE: 04/21/2003
Name: SWEET WATER CREEK, OLD TAMPA BAY
FLORIDA
NOAA Chart: 11413 Latitude: 27° 58.7' N
USGS Quad: GANDY BRIDGE Longitude: 82° 33.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 6727 C 1976
MONUMENTATION: Survey Disk VM#: 7542
AGENCY: PID#: AG7582
SETTING CLASSIFICATION: Concrete Box Culvert
The bench mark is set in the SE corner of a concrete box culvert, 105.5 feet
(32.2 m) NW of Bench Mark 6727 E 1976, 36 feet (11 m) east of the SE corner of
the chainlink fence at the south edge of the apartment complex, 28 feet (9 m)
west of the centerline of Dana Shores Drive, and 2 feet (0.6 m) below the road.
BENCH MARK STAMPING: 6727 E 1976
MONUMENTATION: Survey Disk VM#: 7543
AGENCY: PID#: AG7583
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is across the road from the SE corner of the apartment complex,
27 feet (8 m) east of the centerline of Dana Shores Drive, 1 foot (0.3 m) north
of telephone pole #5201, and level with the road. The bench mark is crimped to
the top of a copper-clad steel rod driven to refusal, and encased in a PVC pipe
and concrete kickblock.
BENCH MARK STAMPING: 6727 F 1976
MONUMENTATION: Survey Disk VM#: 7544
AGENCY: PID#: AG7584
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is at the south end of the apartment complex, 93 feet (28 m) SSW
of the NE corner of apartment building #5427, 38.6 feet (11.8 m) south of the
centerline of the roadway around the complex, and 0.9 foot (0.3 m) east of the
NE fence corner of the boat storage area. The bench mark is 0.8 foot (0.2 m)
below ground level, crimped to the top of a copper-clad steel rod driven 40 feet
(12 m), and encased in a PVC pipe and concrete kickblock.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 09/14/1990
Station ID: 8726727 SUPERCEDED DATE: 04/21/2003
Name: SWEET WATER CREEK, OLD TAMPA BAY
FLORIDA
NOAA Chart: 11413 Latitude: 27° 58.7' N
USGS Quad: GANDY BRIDGE Longitude: 82° 33.7' W
T I D A L D A T U M S
Tidal datums at SWEET WATER CREEK, OLD TAMPA BAY based on:
LENGTH OF SERIES: 3 MONTHS
TIME PERIOD: OCTOBER-DECEMBER 1976
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8726689 BAY ARISTOCRAT
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (01/10/1977) = 3.87
MEAN HIGHER HIGH WATER (MHHW) = 2.66
MEAN HIGH WATER (MHW) = 2.39
MEAN TIDE LEVEL (MTL) = 1.36
* NATIONAL GEODETIC VERTICAL DATUM-1929 (NGVD) = 0.93
MEAN LOW WATER (MLW) = 0.33
MEAN LOWER LOW WATER (MLLW) = 0.00
LOWEST OBSERVED WATER LEVEL (12/01/1976) = -0.87
* NGVD reference based on elevations published in Quad HGZ L247, 1986, and
NOS leveling of 1982.
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
6727 A 1976 5.65 3.26
6727 B 1976 5.62 3.23
6727 C 1976 6.35 3.96
6727 E 1976 6.94 4.55
6727 F 1976 6.86 4.47
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 09/14/1990
Station ID: 8726727 SUPERCEDED DATE: 04/21/2003
Name: SWEET WATER CREEK, OLD TAMPA BAY
FLORIDA
NOAA Chart: 11413 Latitude: 27° 58.7' N
USGS Quad: GANDY BRIDGE Longitude: 82° 33.7' 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 (NAVD 88).
NGVD 29 is a fixed datum adopted as a national standard geodetic reference for
heights but is now considered superseded. NGVD 29 is sometimes referred to as
Sea Level Datum of 1929 or as Mean Sea Level on some early issues of Geological
Survey Topographic Quads. NGVD 29 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 NGVD 29 are available from the National
Geodetic Survey (NGS) data base via the World Wide Web at
National Geodetic Survey.
NAVD 88 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. NAVD 88 replaces NGVD 29 as the national
standard geodetic reference for heights. Bench mark elevations relative to
NAVD 88 are available from NGS through the World Wide Web at
National Geodetic Survey.
NGVD 29 and NAVD 88 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 NAVD 88 elevation is shown on the Elevations of Tidal Datums Table Referred
to MLLW only when two or more of the bench marks listed have NAVD 88 elevations.
The NAVD 88 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, NAVD 88 bench mark elevations computed indirectly from the tidal
datums elevation table may differ slightly from NAVD 88 elevations listed for
each bench mark in the NGS database.