Superseded Bench Mark Sheet for 8727336, DIXIE BAY FL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:  09/04/1984
Station ID: 8727336                                SUPERCEDED DATE:   04/21/2003
Name:       DIXIE BAY, SALT RIVER                             
            FLORIDA
NOAA Chart: 11409                                  Latitude:         28° 52.9' N
USGS Quad:  RED LEVEL                              Longitude:        82° 38.1' W


To reach the tidal bench marks from the intersection of U.S. Highway 19-98 and
State Highway 44 proceed west on S-44 2.35 miles (3.78 km) to its intersection
with Suncoast Boulevard, turn left and proceed on Suncoast Boulevard 1.0 mile
(1.6 km), turn left and proceed on Dixie Shore Drive 0.1 mile (0.2 km) to Bay
Shore Drive, turn right and follow Bay Shore Dirve 0.4 mile (0.6 km) to a one
story brick house on the left.  The bench marks are located along Bayshore
Drive.  The tide gage and staff were located on the dock behind the private
brick residence.


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


                 PRIMARY BENCH MARK STAMPING:  7336 B 1978

MONUMENTATION:           Survey Disk                               VM#:     7791
AGENCY:                                                            PID#:  AL7758
SETTING CLASSIFICATION:  Unspecified Steel Rod


The bench mark is 178.0 feet (54.2 m) west of Bench Mark 7336 C 1978, 157.0 feet
(47.9 m) SW of the sea wall end of the canal, 108.0 feet (32.9 m) NNW of the NW
corner of a garage, and 4.3 feet (1.3 m) south of a witness sign nailed to power
pole #234.  The bench mark is crimped to a steel rod driven 24 feet (7 m) to
refusal, and encased in a PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  7336 A 1978

MONUMENTATION:           Survey Disk                               VM#:     7790
AGENCY:                                                            PID#:  AL7759
SETTING CLASSIFICATION:  Concrete Post


The bench mark is near the private brick residence, 203.8 feet (62.1 m) NE of
Bench Mark 7336 B 1978, 75.8 feet (23.1 m) south of the SW corner of garage of
the private residence, 14.9 feet (4.5 m) NW of the centerline of Bay Shore
Drive, 3.7 feet (1.1 m) SE of a witness sign nailed to telephone pole #41451,
and set in a concrete post.

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

                                                   PUBLICATION DATE:  09/04/1984
Station ID: 8727336                                SUPERCEDED DATE:   04/21/2003
Name:       DIXIE BAY, SALT RIVER                             
            FLORIDA
NOAA Chart: 11409                                  Latitude:         28° 52.9' N
USGS Quad:  RED LEVEL                              Longitude:        82° 38.1' W


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


                         BENCH MARK STAMPING:  7336 C 1978

MONUMENTATION:           Survey Disk                               VM#:     7792
AGENCY:                                                            PID#:  AL7760
SETTING CLASSIFICATION:  Concrete Post


The bench mark is 336.0 feet (102.4 m) west of Bench Mark 7336 D 1978, 112.0
feet (34.1 m) south of the sea wall of the canal, 99.6 feet (30.3 m) north of
the NE corner of a private residence, 20.0 feet (6.1 m) north of the centerline
of Bay Shore Drive, 5.5 feet (1.7 m) east of power pole #233, and set in a
concrete post.



                         BENCH MARK STAMPING:  7336 D 1978

MONUMENTATION:           Survey Disk                               VM#:     7793
AGENCY:                                                            PID#:  AL7757
SETTING CLASSIFICATION:  Unspecified Steel Rod


The bench mark is 200.3 feet (61.1 m) west of Bench Mark 7336 E 1978, 41.8 feet
(12.7 m) SE of power pole #445, 12.4 feet(3.8 m) south of the centerline of Bay
Shore Drive, and 3.0 feet (0.9 m) north of witness sign nailed to power pole
#442408.  The bench mark is crimped to a steel rod driven 16 feet (5 m) to
refusal and encased in a PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  7336 E 1978

MONUMENTATION:           Survey Disk                               VM#:     7794
AGENCY:                                                            PID#:  AL7756
SETTING CLASSIFICATION:  Concrete Post


The bench mark is 200.3 feet (61.1 m) east of Bench Mark 7336 D 1978, 79.0 feet
(24.1 m) south of SW corner of a private residence, 13.0 feet (4.0 m) south of
the centerline of Bay Shore Drive, 2.0 feet (0.6 m) north of a witness sign
nailed to power pole #41446, and set in a concrete post.

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

                                                   PUBLICATION DATE:  09/04/1984
Station ID: 8727336                                SUPERCEDED DATE:   04/21/2003
Name:       DIXIE BAY, SALT RIVER                             
            FLORIDA
NOAA Chart: 11409                                  Latitude:         28° 52.9' N
USGS Quad:  RED LEVEL                              Longitude:        82° 38.1' W


                            T I D A L   D A T U M S 


Tidal datums at DIXIE BAY, SALT RIVER based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           JULY-AUGUST 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 (12/05/1978)         =   4.09
     MEAN HIGHER HIGH WATER                     MHHW   =   2.15
     MEAN HIGH WATER                            MHW    =   1.87
     MEAN TIDE LEVEL                            MTL    =   1.04
     MEAN LOW WATER                             MLW    =   0.21
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (06/11/1978)         =   0.08

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     7336 B 1978                                 4.97      3.10
     7336 A 1978                                 4.61      2.74
     7336 C 1978                                 5.28      3.41
     7336 D 1978                                 5.40      3.53
     7336 E 1978                                 5.69      3.82


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

                                                   PUBLICATION DATE:  09/04/1984
Station ID: 8727336                                SUPERCEDED DATE:   04/21/2003
Name:       DIXIE BAY, SALT RIVER                             
            FLORIDA
NOAA Chart: 11409                                  Latitude:         28° 52.9' N
USGS Quad:  RED LEVEL                              Longitude:        82° 38.1' 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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