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Bench Mark Sheet for 8725744, Punta Gorda FL

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

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  7

                                                                                
Station ID: 8725744                         PUBLICATION DATE:  01/06/2004
Name:       PUNTA GORDA                                       
            FL
NOAA Chart: 11426                           Latitude:   26° 55.7' N (  26.92830)
USGS Quad:  PUNTA GORDA                     Longitude:  82°  3.9' W ( -82.06500)


To reach the tidal bench marks from the town of Punta Gorda, proceed 0.3 km (0.2
mi) along Taylor Street from the courthouse, then turn left and proceed west
along West Retta Esplanade for 1.8 km (1.1 mi) to the intersection with Maude
Street, then turn left and proceed north on Maude Street until it reaches a dead
end.  The tide gage and staff were located near the Gulf Dil Docks.  The bench
marks are located in the vicinity of the seawall near Maude Street and the
intersection of Berry Street and Retta Esplanade.


                         T I D A L   B E N C H   M A R K S
                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                                                
Station ID: 8725744                         PUBLICATION DATE:  01/06/2004
Name:       PUNTA GORDA                                       
            FL
NOAA Chart: 11426                           Latitude:   26° 55.7' N (  26.92830)
USGS Quad:  PUNTA GORDA                     Longitude:  82°  3.9' W ( -82.06500)


                         T I D A L   B E N C H   M A R K S


                 PRIMARY BENCH MARK STAMPING:  GORDA 1934
                         DESIGNATION:          GORDA

MONUMENTATION:           Triangulation Station disk            VM#:        11154
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG1628
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   26° 55.9' N (  26.93170)          LONGITUDE:  82°  3.5' W ( -82.05830)


The primary bench mark is a disk set in top of a 0.30 m (1.0 ft) diameter
concrete post near the west corner of the lawn of the Kiwanis Scout House, 67.21
m (220.5 ft) NW of the centerline of Retta Esplanade, 23.01 m (75.5 ft) SE of
the edge of the seawall along Peace River, 7.68 m (25.2 ft) SW of the west
corner of the building, and 5.49 m (18.0 ft) NE of the NE edge of the concrete
curb that is along the SW edge of the lawn.



                         BENCH MARK STAMPING:  BM 1 1955
                         DESIGNATION:          872 5744 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:        11150
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG1630
SETTING CLASSIFICATION:  Concrete base of brick supports       OPUS PID:        
LATITUDE:   26° 55.7' N (  26.92830)          LONGITUDE:  82°  3.9' W ( -82.06500)


The bench mark is a disk set in the top of the concrete base of the brick
supports for storage tank No. 4 at the Gulf Oil Dock on the Municipal Pier off
Maude Street, 10.82 m (35.5 ft) SSE of the south corner of the pump house
building, and 3.26 m (10.7 ft) NE of the SW edge of the concrete dock.  NOTE:
Mark not found in 1989, 1994.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                                                
Station ID: 8725744                         PUBLICATION DATE:  01/06/2004
Name:       PUNTA GORDA                                       
            FL
NOAA Chart: 11426                           Latitude:   26° 55.7' N (  26.92830)
USGS Quad:  PUNTA GORDA                     Longitude:  82°  3.9' W ( -82.06500)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  BM 2 1955
                         DESIGNATION:          872 5744 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:        11151
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG1631
SETTING CLASSIFICATION:  Concrete foundation of garage         OPUS PID:        
LATITUDE:   26° 55.7' N (  26.92830)          LONGITUDE:  82°  3.9' W ( -82.06500)


The bench mark is a disk set in the top of the westernmost corner of the
concrete foundation of the garage at the Gulf Oil Dock, 22 m (72 ft) SW of the
centerline of Maude Street, 18.14 m (59.5 ft) NE of the SW edge of the dock, and
6.40 m (21.0 ft) NE of the most eastern corner of the concrete foundation of the
main truck loading shed.  NOTE:  Mark not found in 1989, 1994 and 2001.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                                                
Station ID: 8725744                         PUBLICATION DATE:  01/06/2004
Name:       PUNTA GORDA                                       
            FL
NOAA Chart: 11426                           Latitude:   26° 55.7' N (  26.92830)
USGS Quad:  PUNTA GORDA                     Longitude:  82°  3.9' W ( -82.06500)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  GORDA NO 2 1934
                         DESIGNATION:          GORDA RM 2

MONUMENTATION:           Reference Mark disk                   VM#:        11155
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG1629
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   26° 55.9' N (  26.93099)          LONGITUDE:  82°  3.5' W ( -82.05879)


The bench mark is a disk set in the top of a concrete monument at the south
corner of the lawn at the Lou Calder Scout House, 32.31 m (106.0 ft) south of
the south corner of the house, 8.69 m (28.5 ft) NW of the centerline of Retta
Esplanade, 2.44 m (8.0 ft) SW of the centerline of the driveway leading to the
house, 2.29 m (7.5 ft) SE of a lone 0.76 m (2.5 ft) diameter palm tree, 0.30 m
(1.0 ft) NW of a metal witness post, and 0.06 m (0.2 ft) above ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                                                
Station ID: 8725744                         PUBLICATION DATE:  01/06/2004
Name:       PUNTA GORDA                                       
            FL
NOAA Chart: 11426                           Latitude:   26° 55.7' N (  26.92830)
USGS Quad:  PUNTA GORDA                     Longitude:  82°  3.9' W ( -82.06500)


                         T I D A L   B E N C H   M A R K S


                         BENCH MARK STAMPING:  GORDA 1934 NO 5 1974
                         DESIGNATION:          GORDA RM 5

MONUMENTATION:           Reference Mark disk                   VM#:        11156
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG1627
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   26° 55.9' N (  26.93136)          LONGITUDE:  82°  3.6' W ( -82.05917)


The bench mark is a disk set flush in the top of the concrete seawall at the Lou
Calder Scout House, 63 m (208 ft) NW of the centerline of Retta Esplanade, 28 m
(92 ft) WSW of the south corner of the Scout House, 13 m (43 ft) SW of the west
corner of the house, 4.57 m (15.0 ft) SW of triangulation station GORDA 1934,
and 0.12 m (0.4 ft) above ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                                                
Station ID: 8725744                         PUBLICATION DATE:  01/06/2004
Name:       PUNTA GORDA                                       
            FL
NOAA Chart: 11426                           Latitude:   26° 55.7' N (  26.92830)
USGS Quad:  PUNTA GORDA                     Longitude:  82°  3.9' W ( -82.06500)


                            T I D A L   D A T U M S 


Tidal datums at PUNTA GORDA based on:

     LENGTH OF SERIES:      8 MONTHS
     TIME PERIOD:           July 1977 - February 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   =  0.598
     MEAN HIGH WATER                            MHW    =  0.519
     North American Vertical Datum              NAVD88 =  0.502
     MEAN TIDE LEVEL                            MTL    =  0.328
     MEAN SEA LEVEL                             MSL    =  0.326
     MEAN LOW WATER                             MLW    =  0.137
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     GORDA 1934                                  1.400    0.881
     BM 1 1955                                   1.679    1.160
     BM 2 1955                                   1.869    1.350
     GORDA NO 2 1934                             1.433    0.914
     GORDA 1934 NO 5 1974                        1.450    0.931


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  7

                                                                                
Station ID: 8725744                         PUBLICATION DATE:  01/06/2004
Name:       PUNTA GORDA                                       
            FL
NOAA Chart: 11426                           Latitude:   26° 55.7' N (  26.92830)
USGS Quad:  PUNTA GORDA                     Longitude:  82°  3.9' W ( -82.06500)


                             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.

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Products available at 8725744 Punta Gorda, FL

Revised: 08/08/2018
NOAA / National Ocean Service
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