Superseded Bench Mark Sheet for 8726976, BAILEYS BLUFF INSIDE FL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:  07/14/1989
Station ID: 8726976                                SUPERCEDED DATE:   04/21/2003
Name:       BAILEYS BLUFF INSIDE, ANCLOTE ANCHORAGE           
            FLORIDA
NOAA Chart: 11409                                  Latitude:         28° 12.1' N
USGS Quad:  TARPON SPRINGS                         Longitude:        82° 46.8' W


To reach the tidal bench marks from Tarpon Springs City Hall, proceed north on
U.S. Highway 19 Alt. for 2.0 miles (3.2 km) to Anclote Boulevard, then west on
Anclote Boulevard for 2.0 miles (3.2 km) to its end at Baileys Bluff Road, then
north and east on Baileys Bluff Road for 2.4 miles (3.8 km) to Gulfview Drive,
then 0.1 mile (0.2 km) north on Gulfview Drive to East Bayou Road.  The bench
marks are along Gulfview Drive. The gage and staff were at house #12 on East
Bayou Road.


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


                 PRIMARY BENCH MARK STAMPING:  6976 B 1976

MONUMENTATION:           Survey Disk                               VM#:     7677
AGENCY:                                                            PID#:  AL7475
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is at the SW corner of the intersection of Gulfview Drive and
East Bayou Road, 22.0 feet (6.7 m) south of the centerline of East Bayou Road,
18.6 feet (5.7 m) west of the centerline of Gulfview Drive, and 2.5 feet (0.8 m)
NW of utility pole #14B-6795R with witness sign.  The bench mark is at ground
level, crimped to a copper-clad steel rod driven to refusal, and encased in a
PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  6976 C 1976

MONUMENTATION:           Survey Disk                               VM#:     7678
AGENCY:                                                            PID#:  AL7476
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is 0.1 mile (0.2 km) north of Bench Mark 6976 B 1976, 21.0 feet
(6.4 m) east of the centerline of Gulfview Drive, and 2.0 feet (0.6 m) south of
a utility pole with witness sign.  The bench mark is 0.3 foot (0.1 m) below
ground level, crimped to a copper-clad steel rod driven to refusal, and encased
in a PVC pipe and concrete kickblock.

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

                                                   PUBLICATION DATE:  07/14/1989
Station ID: 8726976                                SUPERCEDED DATE:   04/21/2003
Name:       BAILEYS BLUFF INSIDE, ANCLOTE ANCHORAGE           
            FLORIDA
NOAA Chart: 11409                                  Latitude:         28° 12.1' N
USGS Quad:  TARPON SPRINGS                         Longitude:        82° 46.8' W


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


                         BENCH MARK STAMPING:  6976 D 1976

MONUMENTATION:           Survey Disk                               VM#:     7679
AGENCY:                                                            PID#:  AL7477
SETTING CLASSIFICATION:  Copper-clad Steel Rod


The bench mark is 0.2 mile (0.3 km) north of Bench Mark 6976 C 1976, 31.0 feet
(9.4 m) ENE of the centerline of Gulfview Drive, 15.6 feet (4.8 m) west of the
centerline of Pineview Circle, and 1.0 foot (0.3 m) SSW of a utility pole with
witness sign.  The bench mark is at ground level, crimped to a copper-clad steel
rod driven to refusal, and encased in a PVC pipe and concrete kickblock.



                         BENCH MARK STAMPING:  6976 E 1983

MONUMENTATION:           Survey Disk                               VM#:     7680
AGENCY:                                                            PID#:  AL7474
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set in the top of a concrete monument, 0.1 mile (0.2 km) south
of Bench Mark 6976 B 1976, 22.6 feet (6.9 m) west of the centerline of Gulfview
Drive, 20.0 feet (6.1 m) north of the extended centerline of Baileys Bluff Road,
2.4 feet (0.7 m) west of utility pole #2-36457 with witness sign, 11.0 feet (3.4
m) east of the easternmost anchor for the utility pole, and at ground level.

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

                                                   PUBLICATION DATE:  07/14/1989
Station ID: 8726976                                SUPERCEDED DATE:   04/21/2003
Name:       BAILEYS BLUFF INSIDE, ANCLOTE ANCHORAGE           
            FLORIDA
NOAA Chart: 11409                                  Latitude:         28° 12.1' N
USGS Quad:  TARPON SPRINGS                         Longitude:        82° 46.8' W


                            T I D A L   D A T U M S 


Tidal datums at BAILEYS BLUFF INSIDE, ANCLOTE ANCHORAGE based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           MARCH 1976
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8726924 ANCLOTE, ANCLOTE RIVER


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

     HIGHEST OBSERVED WATER LEVEL (02/01/1976)         =   4.60
     MEAN HIGHER HIGH WATER                     MHHW   =   3.10
     MEAN HIGH WATER                            MHW    =   2.71
     MEAN TIDE LEVEL                            MTL    =   1.61
     MEAN LOW WATER                             MLW    =   0.51
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (02/14/1976)         =  -0.63

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     6976 B 1976                                 8.13      5.42
     6976 C 1976                                15.82     13.11
     6976 D 1976                                11.23      8.52
     6976 E 1983                                20.30     17.59


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

                                                   PUBLICATION DATE:  07/14/1989
Station ID: 8726976                                SUPERCEDED DATE:   04/21/2003
Name:       BAILEYS BLUFF INSIDE, ANCLOTE ANCHORAGE           
            FLORIDA
NOAA Chart: 11409                                  Latitude:         28° 12.1' N
USGS Quad:  TARPON SPRINGS                         Longitude:        82° 46.8' 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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