Superseded Bench Mark Sheet for 8727411, YANKEETOWN, WITHLACOOCHEE RIVER FL

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  4

                                                   PUBLICATION DATE:  06/12/1991
Station ID: 8727411                                SUPERCEDED DATE:   04/21/2003
Name:       YANKEETOWN, WITHLACOOCHEE RIVER                   
            FLORIDA
NOAA Chart: 11408                                  Latitude:         29°  1.8' N
USGS Quad:  YANKEETOWN                             Longitude:        82° 42.8' W


To reach the tidal bench marks from the intersection of  U.S. Highway 19-98 and
State Highway C-40 in Inglis, proceed west on State Highway C-40 2.6 miles (4.2
km) to 56th Street, turn left and proceed south 0.2 mile (0.3 km) to Riverside
Drive, turn right and continue west 0.2 mile (0.3 km) to the Coast Guard base. 
The bench marks are near the Coast Guard base.  The tide gage and staff were on
the Coast Guard Station pier.


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


                 PRIMARY BENCH MARK STAMPING:  7411 D 1978

MONUMENTATION:           Survey Disk                               VM#:     8191
AGENCY:                                                            PID#:  AR1654
SETTING CLASSIFICATION:  Galvanized Steel Rod


The primary bench mark is 168 feet (51 m) NE of the centerline of 61st Street,
32 feet (10 m) NW of the centerline of east bound Riverside Drive, 26 feet (8 m)
SE of the centerline of westbound Riverside Drive, and 1.9 feet (0.6 m) SW of a
power pole with witness sign.  The bench mark is crimped to a steel rod driven 7
feet (2 m) to refusal, and encased in a PVC pipe and a concrete kickblock.



                         BENCH MARK STAMPING:  7411 B 1978

MONUMENTATION:           Survey Disk                               VM#:     8189
AGENCY:                                                            PID#:  AR1656
SETTING CLASSIFICATION:  Concrete Pad


The bench mark is set in a concrete pad supporting a flag pole, 428 feet (130 m)
north of Bench Mark L 21 1933, 50 feet (15 m) NW of the centerline of Harmony
Lane, 2.5 feet (0.8 m) east of the SE corner of the post office located on
Harmony Lane off 63rd Street, and 1.4 feet (0.4 m) south of the flag pole.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  4

                                                   PUBLICATION DATE:  06/12/1991
Station ID: 8727411                                SUPERCEDED DATE:   04/21/2003
Name:       YANKEETOWN, WITHLACOOCHEE RIVER                   
            FLORIDA
NOAA Chart: 11408                                  Latitude:         29°  1.8' N
USGS Quad:  YANKEETOWN                             Longitude:        82° 42.8' W


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


                         BENCH MARK STAMPING:  7411 C 1978

MONUMENTATION:           Survey Disk                               VM#:     8190
AGENCY:                                                            PID#:  AR1655
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in the top of a concrete monument on the south side of
Riverside Drive at the intersection of 62nd Street, 621 feet (189 m) WSW of
Bench Mark 7411 D 1978, 56 feet (17 m) SW of the centerline of a sand driveway,
19 feet (6 m) SSE of the centerline of eastbound Riverside Drive, and 2.9 feet
(0.9 m) NW of a power pole with a witness sign attached.



                         BENCH MARK STAMPING:  L 21 1933 7.526

MONUMENTATION:           Survey Disk                               VM#:     8192
AGENCY:                                                            PID#:  AR0721
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in the top of a concrete monument, 428 feet (130 m) south
of the flagpole of the post office, and 14.5 feet (4.4 m) SE of a flagpole
located at the Izzak Walton Lodge.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  4

                                                   PUBLICATION DATE:  06/12/1991
Station ID: 8727411                                SUPERCEDED DATE:   04/21/2003
Name:       YANKEETOWN, WITHLACOOCHEE RIVER                   
            FLORIDA
NOAA Chart: 11408                                  Latitude:         29°  1.8' N
USGS Quad:  YANKEETOWN                             Longitude:        82° 42.8' W


                            T I D A L   D A T U M S 


Tidal datums at YANKEETOWN, WITHLACOOCHEE RIVER based on:

     LENGTH OF SERIES:      6 MONTHS
     TIME PERIOD:           JULY-DECEMBER 1978
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8727520 CEDAR KEY


Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in FEET:

     HIGHEST OBSERVED WATER LEVEL (12/01/1978)         =   5.70
     MEAN HIGHER HIGH WATER                     MHHW   =   3.88
     MEAN HIGH WATER                            MHW    =   3.53
     MEAN TIDE LEVEL                            MTL    =   2.04
     MEAN LOW WATER                             MLW    =   0.54
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (12/28/1978)         =  -1.59

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     7411 D 1978                                12.78      9.25
     7411 B 1978                                13.02      9.49
     7411 C 1978                                 9.03      5.50
     L 21 1933 7.526                             8.89      5.36


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

                                                   PUBLICATION DATE:  06/12/1991
Station ID: 8727411                                SUPERCEDED DATE:   04/21/2003
Name:       YANKEETOWN, WITHLACOOCHEE RIVER                   
            FLORIDA
NOAA Chart: 11408                                  Latitude:         29°  1.8' N
USGS Quad:  YANKEETOWN                             Longitude:        82° 42.8' 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 (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 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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