Bench Mark Sheet for 8725835, LIVERRPOOL, PEACE RIVER 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  5

                                                                                
Station ID: 8725835                         PUBLICATION DATE:  11/13/2003
Name:       LIVERRPOOL, PEACE RIVER                           
            FL
NOAA Chart: 11426                           Latitude:   27°  2.6' N (  27.04330)
USGS Quad:  FORT OGDEN                      Longitude:  81° 59.2' W ( -81.98670)


To reach the tidal bench marks proceed 18.5 km (11.5 mi) north along US Highway
19 from Punta Gorda to the intersection of US Highway 19 and the Sunnybreeze
Golf Course Road.  Continue NW on Sunnybreeze Golf Course Road and SW along the
SSE side of the canal, continue on a dirt road to the Trailer Park.  The bench
marks are along the road leading to the Trailer Park and on the Trailer Park
grounds, and the gage and staff were on the County Dock.


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


                 PRIMARY BENCH MARK STAMPING:  5835 A 1977
                         DESIGNATION:          872 5835 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6082
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AF7408
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID:        
LATITUDE:   27°  2.6' N (  27.04330)          LONGITUDE:  81° 59.2' W ( -81.98670)


The primary bench mark is a disk set into the concrete south of a turn-around at
the Trailer Park, 24.69 m (81.0 ft) SW of Bench Mark 5835 B 1977, 2 m (7 ft)
south of the edge of the shoreline and 0.61 m (2.0 ft) NE of a water tank.



                         BENCH MARK STAMPING:  5835 B 1977
                         DESIGNATION:          872 5835 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6083
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AF7409
SETTING CLASSIFICATION:  Concrete floor                        OPUS PID:        
LATITUDE:   27°  2.6' N (  27.04330)          LONGITUDE:  81° 59.2' W ( -81.98670)


The bench mark is a disk set into concrete SE of a turn-around, 11.28 m (37.0
ft) south of a utility pole, 9 m (30 ft) south of the centerline of a dirt road
leading to the trailer park and 0.76 m (2.5 ft) east of the door into the ladies
rest room.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                                                
Station ID: 8725835                         PUBLICATION DATE:  11/13/2003
Name:       LIVERRPOOL, PEACE RIVER                           
            FL
NOAA Chart: 11426                           Latitude:   27°  2.6' N (  27.04330)
USGS Quad:  FORT OGDEN                      Longitude:  81° 59.2' W ( -81.98670)


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


                         BENCH MARK STAMPING:  LIVERPOOL B M 1 1956
                         DESIGNATION:          872 5835 LIVERPOOL 1

MONUMENTATION:           Tidal Station disk                    VM#:         6084
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AF5100
SETTING CLASSIFICATION:  Pipe                                  OPUS PID:        
LATITUDE:   27°  2.7' N (  27.04500)          LONGITUDE:  81° 59.1' W ( -81.98500)


The bench mark is a disk 118 m (387 ft) SE of a picnic shelter, 33 m (108 ft)
west of Bench Mark LIVERPOOL 3, 30.18 m (99.0 ft) SW of the centerline of the
road leading SE and 13.56 m (44.5 ft) west of the west corner of a concrete
block store building, and is set into the top of a 0.09 m (0.3 ft) diameter pipe
projecting 0.43 m (1.4 ft).



                         BENCH MARK STAMPING:  LIVERPOOL B M 4 1959
                         DESIGNATION:          872 5835 LIVERPOOL 4

MONUMENTATION:           Tidal Station disk                    VM#:         6085
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AF5099
SETTING CLASSIFICATION:  Concrete floor                        OPUS PID:        
LATITUDE:   27°  2.7' N (  27.04500)          LONGITUDE:  81° 59.1' W ( -81.98500)


The bench mark is a disk set into concrete in the south side of the floor as a
picnic shelter, 5.79 m (19.0 ft) west of the centerline of the boat ramp, 4 m
(13 ft) east of the extended centerline of the blacktopped road, 2.53 m (8.3 ft)
west of the SE corner and 0.30 m (1.0 ft) north of the south side of the picnic
shelter floor.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                                                
Station ID: 8725835                         PUBLICATION DATE:  11/13/2003
Name:       LIVERRPOOL, PEACE RIVER                           
            FL
NOAA Chart: 11426                           Latitude:   27°  2.6' N (  27.04330)
USGS Quad:  FORT OGDEN                      Longitude:  81° 59.2' W ( -81.98670)


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


                         BENCH MARK STAMPING:  LIVERPOOL 3
                         DESIGNATION:          872 5835 LIVERPOOL 3

MONUMENTATION:           Tidal Station disk                    VM#:         6086
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AF5101
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   27°  2.7' N (  27.04500)          LONGITUDE:  81° 59.2' W ( -81.98670)


The bench mark is a disk set into the top of a concrete post, at ground level,
36.27 m (119.0 ft) NE of the shoreline, 32.92 m (108.0 ft) east of Bench Mark
LIVERPOOL B M I 1956, 14.33 m (47.0 ft) NE of the north corner of a concrete
block store building, 12 m (39 ft) SE of the centerline of the road leading to
the gas pumps for the boats and 0.37 m (1.2 ft) from a witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                                                
Station ID: 8725835                         PUBLICATION DATE:  11/13/2003
Name:       LIVERRPOOL, PEACE RIVER                           
            FL
NOAA Chart: 11426                           Latitude:   27°  2.6' N (  27.04330)
USGS Quad:  FORT OGDEN                      Longitude:  81° 59.2' W ( -81.98670)


                            T I D A L   D A T U M S 


Tidal datums at LIVERRPOOL, PEACE RIVER based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           February 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   =  0.658
     MEAN HIGH WATER                            MHW    =  0.569
     North American Vertical Datum              NAVD88 =  0.477
     MEAN SEA LEVEL                             MSL    =  0.361
     MEAN TIDE LEVEL                            MTL    =  0.353
     MEAN LOW WATER                             MLW    =  0.136
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     5835 A 1977                                 1.602    1.033
     5835 B 1977                                 2.013    1.444
     LIVERPOOL B M 1 1956                        2.005    1.436
     LIVERPOOL B M 4 1959                        1.516    0.947
     LIVERPOOL 3                                 1.759    1.190


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

                                                                                
Station ID: 8725835                         PUBLICATION DATE:  11/13/2003
Name:       LIVERRPOOL, PEACE RIVER                           
            FL
NOAA Chart: 11426                           Latitude:   27°  2.6' N (  27.04330)
USGS Quad:  FORT OGDEN                      Longitude:  81° 59.2' W ( -81.98670)


                             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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