Superseded Bench Mark Sheet for 8726233, PALMA SOLA BAY, SOUTH FL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:  09/17/1985
Station ID: 8726233                                SUPERCEDED DATE:   04/21/2003
Name:       PALMA SOLA BAY SOUTH                              
            FLORIDA
NOAA Chart: 11414                                  Latitude:         27° 29.1' N
USGS Quad:  BRADENTON BEACH                        Longitude:        82° 38.7' W


To reach the tidal bench marks from Bradenton Post Office travel west on State
Highway 64 for 5.7 miles (9.2 km) to Palma Sola Boulevard, then south on Palma
Sola Boulevard 0.7 mile (1.1 km).  The bench marks are located along nearby
seawalls and along Palma Sola Boulevard.  The tide gage and staff were located
on a private pier owned by Robert C. Knox.


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


                 PRIMARY BENCH MARK STAMPING:  6233 A 1977

MONUMENTATION:           Survey Disk                               VM#:     6157
AGENCY:                                                            PID#:  AG7651
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set flush in a concrete seawall, 98 feet (30 m) north of
centerline of Alhambra Drive, 67 feet (20 m) SE of Bench Mark ELEV 11.62 014-7,
and 59 feet (18 m) east of the centerline of Palma Sola Boulevard.



                         BENCH MARK STAMPING:  6233 B 1977

MONUMENTATION:           Survey Disk                               VM#:     6158
AGENCY:                                                            PID#:  AG7653
SETTING CLASSIFICATION:  Bridge Bulkhead


The bench mark is set flush in the NE bridge bulkhead, 45 feet (14 m) SW of
Bench Mark 6233 C 1977, 18 feet (5 m) east of the centerline of Palma Sola
Boulevard, and 1.0 foot (0.3 m) east of the east edge of the bridge.

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

                                                   PUBLICATION DATE:  09/17/1985
Station ID: 8726233                                SUPERCEDED DATE:   04/21/2003
Name:       PALMA SOLA BAY SOUTH                              
            FLORIDA
NOAA Chart: 11414                                  Latitude:         27° 29.1' N
USGS Quad:  BRADENTON BEACH                        Longitude:        82° 38.7' W


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


                         BENCH MARK STAMPING:  6233 C 1977

MONUMENTATION:           Survey Disk                               VM#:     6159
AGENCY:                                                            PID#:  AG7655
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set flush in a concrete seawall, 348 feet (106 m) west of
Bench Mark 6233 E 1977, 81 feet (25 m) south of the centerline of Alcazar Drive,
and 40 feet (12 m) east of the centerline of Palma Sola Boulevard.



                         BENCH MARK STAMPING:  6233 E 1977

MONUMENTATION:           Survey Disk                               VM#:     6160
AGENCY:                                                            PID#:  AG7654
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is 81 feet (25 m) SW of the intersection of Alcazar Drive and
Portosueno Avenue, 50 feet (15 m) west of a 25-foot (8 m) tall palm tree, and 39
feet (12 m) south of the centerline of Alacazar Drive.



                         BENCH MARK STAMPING:  ELEV 11.62 C14-7

MONUMENTATION:           Survey Disk                               VM#:     6161
AGENCY:                                                            PID#:  AG7652
SETTING CLASSIFICATION:  Bridge Bulkhead


The bench mark is set flush in the SE bridge bulkhead, 60 feet (18 m) south of
Bench Mark 6233 B 1977, 18 feet (5 m) east of centerline of Palma Sola
Boulevard, and 1.4 feet (0.4 m) east of the east edge of the bridge.

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

                                                   PUBLICATION DATE:  09/17/1985
Station ID: 8726233                                SUPERCEDED DATE:   04/21/2003
Name:       PALMA SOLA BAY SOUTH                              
            FLORIDA
NOAA Chart: 11414                                  Latitude:         27° 29.1' N
USGS Quad:  BRADENTON BEACH                        Longitude:        82° 38.7' W


                            T I D A L   D A T U M S 


Tidal datums at PALMA SOLA BAY SOUTH based on:

     LENGTH OF SERIES:      3 MONTHS
     TIME PERIOD:           MAY-OCTOBER 1977
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8726247 BRADENTON


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

     HIGHEST OBSERVED WATER LEVEL (06/29/1977)         =   4.50
     MEAN HIGHER HIGH WATER                     MHHW   =   2.20
     MEAN HIGH WATER                            MHW    =   1.92
     MEAN TIDE LEVEL                            MTL    =   1.11
     MEAN LOW WATER                             MLW    =   0.30
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (04/09/1977)         =  -0.98

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     6233 A 1977                                 3.72      1.80
     6233 B 1977                                12.10     10.18
     6233 C 1977                                 5.05      3.13
     6233 E 1977                                 5.03      3.11
     ELEV 11.62 C14-7                           12.17     10.25


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

                                                   PUBLICATION DATE:  09/17/1985
Station ID: 8726233                                SUPERCEDED DATE:   04/21/2003
Name:       PALMA SOLA BAY SOUTH                              
            FLORIDA
NOAA Chart: 11414                                  Latitude:         27° 29.1' N
USGS Quad:  BRADENTON BEACH                        Longitude:        82° 38.7' 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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