U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 4
PUBLICATION DATE: 05/10/1989
Station ID: 8725441 SUPERCEDED DATE: 04/21/2003
Name: CAPTIVA ISLAND, REDFISH PASS
FLORIDA
NOAA Chart: 11426 Latitude: 26° 33.0' N
USGS Quad: CAPTIVA Longitude: 82° 11.8' W
To reach the tidal bench marks from Punta Rassa SW of Fort Myers, proceed SW
across the Sanibel Causeway to Sanibel Island, then north on the main highway to
the north end of Captiva Island, then take the South Seas Plantation Road for
1.9 miles (3.1 km) after passing the guard shack until the road ends at the
South Seas Plantation gift shop. The bench marks are near the gift shop and
marina. The tide gage and staff were on a pier east of the gift shop near
Redfish Pass.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: NO 2 1965
MONUMENTATION: Survey Disk VM#: 7341
AGENCY: PID#: AG1684
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in a concrete monument, 75.5 feet (23.0 m) WSW of the SW
corner of a former swimming pool which is now a flower garden, 33 feet (10 m)
south of the chimney of a white building (gift shop and The Galley), 1.0 foot
(0.3 m) east of the NE corner of the middle north wing of the Kings Crown Dining
Room, and 0.2 foot (0.1 m) above ground level.
BENCH MARK STAMPING: E 260 1966
MONUMENTATION: Survey Disk VM#: 7342
AGENCY: PID#: AG1685
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is at the edge of the south hedge of South Seas Plantation Road,
0.25 mile (0.40 km) SE of the gift shop and South Seas Plantation, 150 feet (46
m) west of the west edge of a boat ramp, 41.5 feet (12.6 m) north of a white
column at the entrance to the main complex at South Seas Plantation, 15.5 feet
(4.7 m) east of the centerline of South Seas Plantation Road, and 4 feet (1 m)
north of a steel witness post. The bench mark is at ground level, crimped to a
copper-clad steel rod driven 44 feet (13 m), and encased in a 6-inch steel pipe.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 4
PUBLICATION DATE: 05/10/1989
Station ID: 8725441 SUPERCEDED DATE: 04/21/2003
Name: CAPTIVA ISLAND, REDFISH PASS
FLORIDA
NOAA Chart: 11426 Latitude: 26° 33.0' N
USGS Quad: CAPTIVA Longitude: 82° 11.8' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: F 260 1966
MONUMENTATION: Survey Disk VM#: 7343
AGENCY: PID#: AG1678
SETTING CLASSIFICATION: Copper-clad Steel Rod
The bench mark is along a sand road about 250 feet (76 m) west of the
intersection of South Seas Plantation Road and the sand road, 127.5 feet (38.9
m) east of and across the sand road from a house named Sandrift, 38 feet (12 m)
WSW of the SW corner of a tennis court, 19 feet (6 m) east of the centerline of
the sand road, and 1 foot (0.3 m) west of a witness post. The bench mark is at
ground level, crimped to a copper-clad steel rod driven 49 feet (15 m) to
refusal and encased in a 6-inch iron pipe.
BENCH MARK STAMPING: R 87 LEE CO 74
MONUMENTATION: Survey Disk VM#: 7344
AGENCY: PID#: AG9349
SETTING CLASSIFICATION: Concrete Monument
The bench mark is set in the top of a concrete monument about 1.25 miles
(2.01 km) north of the entrance to the South Seas Plantation complex, 64 feet
(20 m) NNE of a fire hydrant, 14.8 feet (4.5 m) north of the centerline of the
driveway to the Chapman residence, 12.5 feet (3.8 m) east of the centerline of
the South Seas Plantation Road, and 0.9 foot (0.3 m) south of utility pole #298.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 4
PUBLICATION DATE: 05/10/1989
Station ID: 8725441 SUPERCEDED DATE: 04/21/2003
Name: CAPTIVA ISLAND, REDFISH PASS
FLORIDA
NOAA Chart: 11426 Latitude: 26° 33.0' N
USGS Quad: CAPTIVA Longitude: 82° 11.8' W
T I D A L D A T U M S
Tidal datums at CAPTIVA ISLAND, REDFISH PASS based on:
LENGTH OF SERIES: 7 MONTHS
TIME PERIOD: NOVEMBER 1965-MAY 1966
TIDAL EPOCH: 1960-1978
CONTROL TIDE STATION: 8725110 NAPLES
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:
HIGHEST OBSERVED WATER LEVEL (05/07/1966) = 2.62
MEAN HIGHER HIGH WATER MHHW = 1.96
MEAN HIGH WATER MHW = 1.72
MEAN TIDE LEVEL MTL = 1.02
* NATIONAL GEODETIC VERTICAL DATUM NGVD29 = 0.49
MEAN LOW WATER MLW = 0.33
MEAN LOWER LOW WATER MLLW = 0.00
LOWEST OBSERVED WATER LEVEL (02/05/1966) = -1.38
* NGVD reference based on elevations published in Quad 260821, 1969, and NOS
leveling of 1984.
North American Vertical Datum (NAVD88)
Bench Mark Elevation Information In FEET above:
Stamping or Designation MLLW MHW
NO 2 1965 5.28 3.56
E 260 1966 5.45 3.73
F 260 1966 5.17 3.45
R 87 LEE CO 74 5.56 3.84
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 4
PUBLICATION DATE: 05/10/1989
Station ID: 8725441 SUPERCEDED DATE: 04/21/2003
Name: CAPTIVA ISLAND, REDFISH PASS
FLORIDA
NOAA Chart: 11426 Latitude: 26° 33.0' N
USGS Quad: CAPTIVA Longitude: 82° 11.8' 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.