Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          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                                     
            FL
NOAA Chart: 11426                           Latitude:   26° 20.2' N (  26.33670)
USGS Quad:  BONITA SPRINGS                  Longitude:  81° 50.7' W ( -81.84500)


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)           IDB PID#:  AD7882
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   26° 20.0' N (  26.33330)          LONGITUDE:  81° 50.7' W ( -81.84500)


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                                     
            FL
NOAA Chart: 11426                           Latitude:   26° 20.2' N (  26.33670)
USGS Quad:  BONITA SPRINGS                  Longitude:  81° 50.7' W ( -81.84500)


                         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)           IDB PID#:  AD7885
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   26° 20.1' N (  26.33500)          LONGITUDE:  81° 50.7' W ( -81.84500)


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)           IDB PID#:  AD7884
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   26° 20.1' N (  26.33500)          LONGITUDE:  81° 50.7' W ( -81.84500)


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                                     
            FL
NOAA Chart: 11426                           Latitude:   26° 20.2' N (  26.33670)
USGS Quad:  BONITA SPRINGS                  Longitude:  81° 50.7' W ( -81.84500)


                         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)           IDB PID#:  AD7883
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   26° 20.1' N (  26.33500)          LONGITUDE:  81° 50.7' W ( -81.84500)


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                                     
            FL
NOAA Chart: 11426                           Latitude:   26° 20.2' N (  26.33670)
USGS Quad:  BONITA SPRINGS                  Longitude:  81° 50.7' W ( -81.84500)


                            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              NAVD88 =  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

North American Vertical Datum (NAVD88)

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                                     
            FL
NOAA Chart: 11426                           Latitude:   26° 20.2' N (  26.33670)
USGS Quad:  BONITA SPRINGS                  Longitude:  81° 50.7' W ( -81.84500)


                             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 NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.

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.