Superseded Bench Mark Sheet for 8722491, JUPITER SOUND, SOUTH END FL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:  12/01/1986
Station ID: 8722491                                SUPERCEDED DATE:   04/21/2003
Name:       SOUTH END, JUPITER SOUND                          
            FLORIDA
NOAA Chart: 11474                                  Latitude:         26° 57.1' N
USGS Quad:  JUPITER                                Longitude:        80°  4.7' W


To reach the tidal bench marks from the intersection of U.S. Highway 1 and State
Highway 707 in Tequesta, proceed 0.35 mile (0.56 km) east on State Highway 707
to the bridge over the Intracoastal Waterway.  The bench marks are in the
vicinity of the bridge.  The tide gage and staff were located on the south end
of the east fence of the bridge over the Intracoastal Waterway.


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


                 PRIMARY BENCH MARK STAMPING:  U 308

MONUMENTATION:           Survey Disk                               VM#:     5538
AGENCY:                                                            PID#:  AD2996
SETTING CLASSIFICATION:  Concrete Bridge Walkway


The bench mark is set in the top of th east end of the south concrete bridge
walkway, 2.8 feet (0.8 m) south of the south curb of the bridge, and 1 foot (0.3
m) above road level.



                         BENCH MARK STAMPING:  NO 1 1972

MONUMENTATION:           Survey Disk                               VM#:     5536
AGENCY:                                                            PID#:  AD6257
SETTING CLASSIFICATION:  Concrete Bridge Walkway


The bench mark is set flush in the concrete walkway on the north side of the
bridge, 375 feet (114 m) west of the east end of the bridge, 230 feet (70 m)
east of the west end of the bridge, and 19.5 feet (5.9 m) north of the
centerline of the bridge.

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

                                                   PUBLICATION DATE:  12/01/1986
Station ID: 8722491                                SUPERCEDED DATE:   04/21/2003
Name:       SOUTH END, JUPITER SOUND                          
            FLORIDA
NOAA Chart: 11474                                  Latitude:         26° 57.1' N
USGS Quad:  JUPITER                                Longitude:        80°  4.7' W


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


                         BENCH MARK STAMPING:  2491 E 1981 BSM

MONUMENTATION:           Survey Disk                               VM#:     5537
AGENCY:                                                            PID#:  AD6258
SETTING CLASSIFICATION:  Concrete Post


The bench mark is set in the top of a concrete post east of the bridge over the
Intracoastal Waterway, 138 feet (42 m) east of the NE corner of the bridge, 32.3
feet (9.8 m) north of the centerline of State Highway 707, 22.3 feet (6.8 m)
west of a blue U.S. mailbox, 2.6 feet (0.8 m) east of the east end of the steel
bridge guard rail, and level with the ground.



                         BENCH MARK STAMPING:  V 308

MONUMENTATION:           Survey Disk                               VM#:     5539
AGENCY:                                                            PID#:  AD2995
SETTING CLASSIFICATION:  Concrete Bridge Walkway


The bench mark is set in the top of the west end of the north concrete bridge
walkway, 2.9 feet (0.9 m) north of the north curb of the bridge, and 1 foot (0.3
m) above road level.

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

                                                   PUBLICATION DATE:  12/01/1986
Station ID: 8722491                                SUPERCEDED DATE:   04/21/2003
Name:       SOUTH END, JUPITER SOUND                          
            FLORIDA
NOAA Chart: 11474                                  Latitude:         26° 57.1' N
USGS Quad:  JUPITER                                Longitude:        80°  4.7' W


                            T I D A L   D A T U M S 


Tidal datums at SOUTH END, JUPITER SOUND based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           November - December, 1972
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8723170 Miami


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

     HIGHEST OBSERVED WATER LEVEL (01/14/1973)         =   3.18
     MEAN HIGHER HIGH WATER                     MHHW   =   2.34
     MEAN HIGH WATER                            MHW    =   2.17
     MEAN TIDE LEVEL                            MTL    =   1.18
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   0.78
     MEAN LOW WATER                             MLW    =   0.19
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (12/07/1972)         =  -0.55

   * NGVD reference based on adjustment of 1972 and NOS levels of 1972. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     U 308                                      19.26     17.09
     NO 1 1972                                  31.10     28.93
     2491 E 1981 BSM                            11.23      9.06
     V 308                                      28.61     26.44


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

                                                   PUBLICATION DATE:  12/01/1986
Station ID: 8722491                                SUPERCEDED DATE:   04/21/2003
Name:       SOUTH END, JUPITER SOUND                          
            FLORIDA
NOAA Chart: 11474                                  Latitude:         26° 57.1' N
USGS Quad:  JUPITER                                Longitude:        80°  4.7' 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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