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Bench Mark Sheet for 8725781, SHELL CREEK, 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  8

                                                                                
Station ID: 8725781                         PUBLICATION DATE:  11/13/2003
Name:       SHELL CREEK, PEACE RIVER                          
            FL
NOAA Chart: 11426                           Latitude:   26° 58.8' N (  26.98000)
USGS Quad:  CLEVELAND                       Longitude:  81° 57.6' W ( -81.96000)


To reach the tidal bench marks proceed 9.7 km (6.0 mi) NE along U.S. Highway 17
from Punta Gorda to the bridge over Shell Creek.  Continue to the first dirt
road leading west to the residence of Richard Sternal, P.O. Box 967.  The gage
site was on the private dock and the bench marks are in the near area.


                         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  8

                                                                                
Station ID: 8725781                         PUBLICATION DATE:  11/13/2003
Name:       SHELL CREEK, PEACE RIVER                          
            FL
NOAA Chart: 11426                           Latitude:   26° 58.8' N (  26.98000)
USGS Quad:  CLEVELAND                       Longitude:  81° 57.6' W ( -81.96000)


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


                 PRIMARY BENCH MARK STAMPING:  B M 3
                         DESIGNATION:          872 5781 TIDAL 3
                         ALIAS:                SRD 3

MONUMENTATION:           Tidal Station disk                    VM#:         7063
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AD1489
SETTING CLASSIFICATION:  Concrete bridge                       OPUS PID:        
LATITUDE:   26° 58.8' N (  26.98000)          LONGITUDE:  81° 57.5' W ( -81.95830)


The primary bench mark is a disk set into the concrete, at the NW end of the
bridge over Shell Creek, 4.72 m (15.5 ft) west of the centerline of U.S. Highway
17, and 0.3 m (1.0 ft) above road surface.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  8

                                                                                
Station ID: 8725781                         PUBLICATION DATE:  11/13/2003
Name:       SHELL CREEK, PEACE RIVER                          
            FL
NOAA Chart: 11426                           Latitude:   26° 58.8' N (  26.98000)
USGS Quad:  CLEVELAND                       Longitude:  81° 57.6' W ( -81.96000)


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


                         BENCH MARK STAMPING:  5781 B
                         DESIGNATION:          872 5781 B TIDAL
                         ALIAS:                DOT

MONUMENTATION:           Bench Mark disk                       VM#:         6060
AGENCY:                  Florida Department of Transportation
                         (FLDOT)                               IDB PID#:  AD7871
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   26° 58.8' N (  26.98000)          LONGITUDE:  81° 57.6' W ( -81.96000)


The bench mark is a disk 28.80 m (94.5 ft) west of the centerline of U.S.
Highway 17, 2.62 m (8.6 ft) north of the centerline of the dirt driveway leading
to the Richard Sternal dwelling, and at ground level.



                         BENCH MARK STAMPING:  BM 1 1956
                         DESIGNATION:          872 5781 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:         6061
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AD1491
SETTING CLASSIFICATION:  Concrete bridge                       OPUS PID:        
LATITUDE:   26° 58.7' N (  26.97830)          LONGITUDE:  81° 57.5' W ( -81.95830)


The bench mark is a disk set flush into the concrete, at the SE end of the
bridge over Shell Creek, 4.88 m (16.0 ft) east of the centerline of U.S. Highway
17, and 0.30 m (1.0 ft) below road surface, 

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  8

                                                                                
Station ID: 8725781                         PUBLICATION DATE:  11/13/2003
Name:       SHELL CREEK, PEACE RIVER                          
            FL
NOAA Chart: 11426                           Latitude:   26° 58.8' N (  26.98000)
USGS Quad:  CLEVELAND                       Longitude:  81° 57.6' W ( -81.96000)


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


                         BENCH MARK STAMPING:  BM 2 1956
                         DESIGNATION:          872 5781 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:         6062
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AD1490
SETTING CLASSIFICATION:  Concrete bridge                       OPUS PID:        
LATITUDE:   26° 58.8' N (  26.98000)          LONGITUDE:  81° 57.6' W ( -81.96000)


The bench mark is a disk set into the concrete, at the SW end of a 30.48 m
(100.0 ft) long concrete bridge over a branch of Shell Creek just NE of the
Richard Sternal residence, and 4.72 m (15.5 ft) west of the centerline of U.S.
Highway 17.



                         BENCH MARK STAMPING:  BM 1 1984 RESET
                         DESIGNATION:          872 5781 TIDAL 1 RESET

MONUMENTATION:           Bench Mark disk                       VM#:         6064
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AD7872
SETTING CLASSIFICATION:  Concrete boat ramp                    OPUS PID:        
LATITUDE:   26° 58.8' N (  26.98000)          LONGITUDE:  81° 57.6' W ( -81.96000)


The bench mark is a disk set flush in the center of the edge of a concrete boat
ramp, 8.90 m (29.2 ft) east of bench mark BM 1 1956, 8.29 m (27.2 ft) WNW of a
power utility pole, and 4.42 m (14.5 ft) WNW of a witness post.  The mark is a
reset mark set by NGS to replace bench mark BM 1 1956.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  8

                                                                                
Station ID: 8725781                         PUBLICATION DATE:  11/13/2003
Name:       SHELL CREEK, PEACE RIVER                          
            FL
NOAA Chart: 11426                           Latitude:   26° 58.8' N (  26.98000)
USGS Quad:  CLEVELAND                       Longitude:  81° 57.6' W ( -81.96000)


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


                         BENCH MARK STAMPING:  N 260
                         DESIGNATION:          N 260

MONUMENTATION:           Survey disk                           VM#:         6065
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AD1488
SETTING CLASSIFICATION:  Concrete head wall                    OPUS PID:        
LATITUDE:   26° 58.4' N (  26.97330)          LONGITUDE:  81° 57.5' W ( -81.95830)


The bench mark is a disk set in the top at the center of the east concrete head
wall of a 2.44 m (8.0 ft) concrete box culvert under the highway, 6.55 m (21.5
ft) east of the center line of the highway, above level with the highway, about
10.62 km (6.6 mi) NE along U.S.Highway 17 from the junction of U.S. Highway 41
at Punta Gorda, and 54.86 m ( 180.0 ft) south of the center of the junction of
U.S. Highway 17 and Riverside Drive, in Section 30, R 24 E, T 40 S.



                         BENCH MARK STAMPING:  BM 2 1984 RESET
                         DESIGNATION:          872 5781 TIDAL 2 RESET

MONUMENTATION:           Bench Mark disk                       VM#:         6066
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AD7870
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   26° 59.0' N (  26.98330)          LONGITUDE:  81° 57.6' W ( -81.96000)


The bench mark is a disk set in the top of a concrete post flush with the
ground, 22 m (72 ft) SE of bench mark BM 2 1956, 0.67 m (2.2 ft) west of a power
utility pole, and 0.30 m (1 ft) south of a witness post.  The mark is a reset
mark set by NGS to replace bench mark BM 2 1956.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  8

                                                                                
Station ID: 8725781                         PUBLICATION DATE:  11/13/2003
Name:       SHELL CREEK, PEACE RIVER                          
            FL
NOAA Chart: 11426                           Latitude:   26° 58.8' N (  26.98000)
USGS Quad:  CLEVELAND                       Longitude:  81° 57.6' W ( -81.96000)


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


                         BENCH MARK STAMPING:  5.249 F24 1933
                         DESIGNATION:          F 24

MONUMENTATION:           Bench Mark disk                       VM#:        16405
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AD1487
SETTING CLASSIFICATION:  Concrete post                         OPUS PID:        
LATITUDE:   26° 58.3' N (  26.97170)          LONGITUDE:  81° 57.7' W ( -81.96170)


The bench mark is a disk set in the top of a concrete post projecting 0.06 m
(0.02 ft), about 0.3 m (1 ft) below the level of the track, about 0.4 km (0.25
m) SW of milepost X 932, near the crossing of Riverside Drive, 17.68 m (58.0 ft)
south of the center of the crossing, in Section 26, R 23 E, T 40 S, 17 m (56 ft)
SE of the SE rail, 12.19 m (40.0 ft) SW of the center line of the drive, 0.40 m
(1.3 ft) NE of a metal witness post, and about 0.30 m (1 ft) below the level of
the track. 

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  8

                                                                                
Station ID: 8725781                         PUBLICATION DATE:  11/13/2003
Name:       SHELL CREEK, PEACE RIVER                          
            FL
NOAA Chart: 11426                           Latitude:   26° 58.8' N (  26.98000)
USGS Quad:  CLEVELAND                       Longitude:  81° 57.6' W ( -81.96000)


                            T I D A L   D A T U M S 


Tidal datums at SHELL CREEK, PEACE RIVER based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           April 1978 - July 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   =  0.668
     MEAN HIGH WATER                            MHW    =  0.570
     North American Vertical Datum              NAVD88 =  0.472
     MEAN SEA LEVEL                             MSL    =  0.352
     MEAN TIDE LEVEL                            MTL    =  0.347
     MEAN LOW WATER                             MLW    =  0.125
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     B M 3                                       3.700    3.130
     5781 B                                      1.722    1.152
     BM 1 1956                                   3.695    3.125
     BM 2 1956                                   3.089    2.519
     BM 1 1984 RESET                             1.291    0.721
     N 260                                       2.451    1.881
     BM 2 1984 RESET                             1.064    0.494
     5.249 F24 1933                              1.726    1.156


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  8

                                                                                
Station ID: 8725781                         PUBLICATION DATE:  11/13/2003
Name:       SHELL CREEK, PEACE RIVER                          
            FL
NOAA Chart: 11426                           Latitude:   26° 58.8' N (  26.98000)
USGS Quad:  CLEVELAND                       Longitude:  81° 57.6' W ( -81.96000)


                             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 8725781 SHELL CREEK, PEACE RIVER, FL

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services