U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Datums Page Page 1 of 5
Station ID: 8725272 PUBLICATION DATE: 11/13/2003
Name: FISH TRAP BAY
FLORIDA
NOAA Chart: 11426 Latitude: 26° 20.2' N
USGS Quad: BONITA SPRINGS Longitude: 81° 50.7' W
To reach the tidal bench marks from the intersection of U.S. Highway 41 and
Bonita Beach Road (County 864), proceed west and north on Bonita Beach Road
(Hickory Boulevard) for 4.3 km (2.7 mi) to its intersection with Forrester
Drive, then turn right and proceed east on Forrester Drive for 0.08 km (0.05 mi)
to where the road turns to the north, then continue north for 0.3 km (0.2 mi) on
road to the house #27312. The bench marks are along Forrester Drive and Bonita
Beach Road. The tide gage and staff were located behind house #27312.
T I D A L B E N C H M A R K S
PRIMARY BENCH MARK STAMPING: 5272 D 1978
DESIGNATION: 872 5272 D TIDAL
MONUMENTATION: Tidal Station disk VM#: 7873
AGENCY: National Ocean Survey (NOS) PID#: AD7882
SETTING CLASSIFICATION: Copper-clad steel rod
The primary bench mark is a disk located at the SE corner of the intersection of
Forrester Drive and the dirt road leading to the gage site, 77.72 m (255.0 ft)
east from the intersection of Hickory Boulevard and Forrester Drive, 18.59 m
(61.0 ft) SW of the south entrance to Kings Kew, 4.57 m (15.0 ft) south of the
centerline of Forrester Drive, 0.61 m (2.0 ft) north of utility pole No. 442912
and 0.15 m (0.5 ft) north of a witness post. The bench mark is crimped to the
top of a copper-coated steel rod driven 5.2 m (17 ft) to refusal, and encased in
a PVC pipe and concrete kickblock. NOTE: Mark recovered in poor condition in
1998 by US Power Squadron.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 2 of 5
Station ID: 8725272 PUBLICATION DATE: 11/13/2003
Name: FISH TRAP BAY
FLORIDA
NOAA Chart: 11426 Latitude: 26° 20.2' N
USGS Quad: BONITA SPRINGS Longitude: 81° 50.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5272 A 1978
DESIGNATION: 872 5272 A TIDAL
MONUMENTATION: Tidal Station disk VM#: 7870
AGENCY: National Ocean Survey (NOS) PID#: AD7885
SETTING CLASSIFICATION: Concrete monument
The bench mark is a disk set into the top of a concrete monument, 8.53 m (28.0
ft) west of the water's edge of Fish Trap Bay, 2.16 m (7.1 ft) west of a large
Norfolk pine tree, 1.37 m (4.5 ft) east of the NE corner of the fence around the
yard at house #27312, 0.30 m (1.0 ft) south of the north property boundary, and
0.24 m (0.8 ft) east of a witness post. NOTE: Mark not found in 1998 by US
Power Squadron.
BENCH MARK STAMPING: 5272 B 1978
DESIGNATION: 872 5272 B TIDAL
MONUMENTATION: Tidal Station disk VM#: 7871
AGENCY: National Ocean Survey (NOS) PID#: AD7884
SETTING CLASSIFICATION: Concrete monument
The bench mark is a disk set into the top of a concrete monument, 11.0 m (36
ft) north of the centerline of the driveway to house #27312, 4.88 m (16.0 ft)
east of the centerline of Forrester Drive, 0.61 m (2.0 ft) SW of the end post of
a white fence, 0.61 m (2.0 ft) south of the north edge of the property line, and
0.24 m (0.8 ft) west of a witness post.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 3 of 5
Station ID: 8725272 PUBLICATION DATE: 11/13/2003
Name: FISH TRAP BAY
FLORIDA
NOAA Chart: 11426 Latitude: 26° 20.2' N
USGS Quad: BONITA SPRINGS Longitude: 81° 50.7' W
T I D A L B E N C H M A R K S
BENCH MARK STAMPING: 5272 C 1978
DESIGNATION: 872 5272 C TIDAL
MONUMENTATION: Tidal Station disk VM#: 7872
AGENCY: National Ocean Survey (NOS) PID#: AD7883
SETTING CLASSIFICATION: Concrete monument
The bench mark is a disk set into the top of a concrete monument located north
of Forrester Drive along the west side of the dirt road, 7.53 m (24.7 ft) west
of the centerline of the Forrester Drive, and 1.07 m (3.5 ft) west of a utility
pole with a witness sign attached. NOTE: Mark not found in 1998 by US Power
Squadron.
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 4 of 5
Station ID: 8725272 PUBLICATION DATE: 11/13/2003
Name: FISH TRAP BAY
FLORIDA
NOAA Chart: 11426 Latitude: 26° 20.2' N
USGS Quad: BONITA SPRINGS Longitude: 81° 50.7' W
T I D A L D A T U M S
Tidal datums at FISH TRAP BAY based on:
LENGTH OF SERIES: 2 MONTHS
TIME PERIOD: April 1978 - May 1978
TIDAL EPOCH: 1983-2001
CONTROL TIDE STATION: 8725110 NAPLES, GULF OF MEXICO
Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS:
MEAN HIGHER HIGH WATER (MHHW) = 0.302
NORTH AMERICAN VERTICAL DATUM-1988 (NAVD) = 0.247
MEAN HIGH WATER (MHW) = 0.239
MEAN TIDE LEVEL (MTL) = 0.144
MEAN SEA LEVEL (MSL) = 0.143
MEAN LOW WATER (MLW) = 0.049
MEAN LOWER LOW WATER (MLLW) = 0.000
National Geodetic Vertical Datum (NGVD 29)
Bench Mark Elevation Information In METERS above:
Stamping or Designation MLLW MHW
5272 D 1978 1.424 1.185
5272 A 1978 1.328 1.089
5272 B 1978 0.858 0.619
5272 C 1978 1.282 1.043
U.S. DEPARTMENT OF COMMERCE
National Oceanic and Atmospheric Administration
National Ocean Service
Page 5 of 5
Station ID: 8725272 PUBLICATION DATE: 11/13/2003
Name: FISH TRAP BAY
FLORIDA
NOAA Chart: 11426 Latitude: 26° 20.2' N
USGS Quad: BONITA SPRINGS Longitude: 81° 50.7' 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.