U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 02/06/1989
Station ID: 8725451 SUPERCEDED DATE: 04/21/2003
Name: CAPE CORAL BRIDGE, CALOOSAHATCHEE RIVER
FLORIDA
NOAA Chart: 11427 Latitude: 26° 33.7' N
USGS Quad: FORT MYERS SW Longitude: 81° 56.0' W
To reach the tidal bench marks from the post office in Cape Coral, travel east
on Cape Coral Parkway for 0.95 mile (1.53 km) to the Cape Coral Bridge. The
bench marks are set along the west end of the bridge. The tide gage and staff
were located at the west end of the bridge.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 1 1965
MONUMENTATION: Survey Disk VM#: 7345
AGENCY: PID#: AD1586
SETTING CLASSIFICATION: Concrete Bridge Footing
The bench mark is set flush in the SE corner of the concrete bridge footing, 93
feet (28 m) south of Bench Mark NO 2 1965, 57 feet (17 m) SE of the SW end of a
wing wall, 48 feet (15 m) south of the centerline of the bridge, 34 feet (10 m)
SSW of the southwestern most support piling, 12 feet (4 m) below the level of
the bridge floor, and 1 foot (0.3 m) from the edge of the concrete footing.
BENCH MARK STAMPING: NO 2 1965
MONUMENTATION: Survey Disk VM#: 7346
AGENCY: PID#: AD1588
SETTING CLASSIFICATION: Concrete Bridge Footing
The bench mark is set flush in the NE corner of a concrete bridge footing, 56
feet (17 m) NE of the NW end of the wingwall, 45 feet (14 m) north of the
centerline of the bridge, 31.5 feet (9.6 m) north of the northwestern most
bridge support piling, and 12 feet (4 m) below the level of the bridge floor.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 02/06/1989
Station ID: 8725451 SUPERCEDED DATE: 04/21/2003
Name: CAPE CORAL BRIDGE, CALOOSAHATCHEE RIVER
FLORIDA
NOAA Chart: 11427 Latitude: 26° 33.7' N
USGS Quad: FORT MYERS SW Longitude: 81° 56.0' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: NO 3 1965
MONUMENTATION: Survey Disk VM#: 7347
AGENCY: PID#: AD1587
SETTING CLASSIFICATION: Concrete Guard Rail
The bench mark is set flush in the west end of a concrete guard rail on the
south side of the bridge, 20.5 feet (6.2 m) SW of a brass disk stamped JE
GREINER COMPANY, 17 feet (5 m) south of the centerline of the bridge, and 1 foot
(0.3 m) above the bridge floor.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 02/06/1989
Station ID: 8725451 SUPERCEDED DATE: 04/21/2003
Name: CAPE CORAL BRIDGE, CALOOSAHATCHEE RIVER
FLORIDA
NOAA Chart: 11427 Latitude: 26° 33.7' N
USGS Quad: FORT MYERS SW Longitude: 81° 56.0' W
T I D A L D A T U M S
Tidal datums at CAPE CORAL BRIDGE, CALOOSAHATCHEE RIVER based on:
LENGTH OF SERIES: 12 MONTHS
TIME PERIOD: APRIL 1965 - MARCH 1966
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8725520 FT. MYERS
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (09/09/1965) = 2.30
MEAN HIGHER HIGH WATER MHHW = 0.98
MEAN HIGH WATER MHW = 0.87
MEAN TIDE LEVEL MTL = 0.47
MEAN LOW WATER MLW = 0.07
MEAN LOWER LOW WATER MLLW = 0.00
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = -0.23
LOWEST OBSERVED WATER LEVEL (09/08/1965) = -2.70
* NGVD reference based on elevations published in Quad 260814, 1969, and NOS
leveling of 1966.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 1 1965 3.71 2.84
NO 2 1965 3.76 2.89
NO 3 1965 15.70 14.83
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 02/06/1989
Station ID: 8725451 SUPERCEDED DATE: 04/21/2003
Name: CAPE CORAL BRIDGE, CALOOSAHATCHEE RIVER
FLORIDA
NOAA Chart: 11427 Latitude: 26° 33.7' N
USGS Quad: FORT MYERS SW Longitude: 81° 56.0' 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.