Superseded Bench Mark Sheet for 8722548, PGA Boulevard Bridge, Palm Beach FL

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  07/23/1987
Station ID: 8722548                                SUPERCEDED DATE:   04/21/2003
Name:       PGA BOULEVARD BRIDGE, INTRACOASTAL WATERWAY       
            FLORIDA
NOAA Chart: 11466                                  Latitude:         26° 50.6' N
USGS Quad:  RIVIERA BEACH                          Longitude:        80°  4.0' W


To reach the tidal bench marks from the intersection of Interstate 95 and PGA
Boulevard, proceed 2.2 miles (3.5 km) east on PGA Boulevard to Waterway Marina. 
The bench marks are located near the marina.  The tide gage and staff were
located on the north end of the west fender of the PGA Boulevard Bridge over the
Intracoastal Waterway.


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


                 PRIMARY BENCH MARK STAMPING:  NO 4 1973

MONUMENTATION:           Survey Disk                               VM#:     5586
AGENCY:                                                            PID#:  AD5745
SETTING CLASSIFICATION:  


The bench mark is set flush in a concrete seawall in the NE corner of the marina
area, 71.4 feet (21.8 m) west of the easternmost face of the seawall, and 6.4
feet (2.0 m) east of the NW corner of the seawall.



                         BENCH MARK STAMPING:  NO 1 1973

MONUMENTATION:           Survey Disk                               VM#:     5584
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set flush in a concrete seawall on the SE end of Waterway
Marina, 74.4 feet (22.7 m) SE of Bench Mark NO 2 1973, 31.6 feet (9.6 m) west of
the easternmost face of the seawall, and 0.8 foot (0.2 m) east of the SW end of
the seawall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  5

                                                   PUBLICATION DATE:  07/23/1987
Station ID: 8722548                                SUPERCEDED DATE:   04/21/2003
Name:       PGA BOULEVARD BRIDGE, INTRACOASTAL WATERWAY       
            FLORIDA
NOAA Chart: 11466                                  Latitude:         26° 50.6' N
USGS Quad:  RIVIERA BEACH                          Longitude:        80°  4.0' W


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


                         BENCH MARK STAMPING:  NO 3 1973

MONUMENTATION:           Survey Disk                               VM#:     5585
AGENCY:                                                            PID#:  AD5744
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set flush in a concrete seawall at the east-central portion of
the marina area, 83.4 feet (25.4 m) north of the SW corner of the seawall, and
79.0 feet (24.1 m) south of the NW corner of the seawall.



                         BENCH MARK STAMPING:  NO 5 1973

MONUMENTATION:           Survey Disk                               VM#:     5587
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set flush in a concrete seawall at the NE end of the marina
area, 81.0 feet (24.7 m) NNE of Bench Mark NO 4 1973, 11.4 feet (3.5 m) west of
the easternmost face of the seawall, and 0.9 foot (0.3 m) east of the NW end of
the seawall.  NOTE:  A fish-cleaning table has been built over the mark.



                         BENCH MARK STAMPING:  2548 F 1981 BSM

MONUMENTATION:           Survey Disk                               VM#:     5588
AGENCY:                                                            PID#:  AD6295
SETTING CLASSIFICATION:  Concrete Monument


The bench mark is set into the top of a concrete monument, 640 feet (195 m) west
of the NW corner of the PGA Boulevard Bridge, 60.0 feet (18.3 m) north of the
centerline of PGA Boulevard, 33.0 feet (10.1 m) west of the centerline of Kidd
Lane, 3.0 feet (1.0 m) WNW of a utility pole, 1.0 foot (0.3 m) south of a
witness post, 0.55 foot (0.17 m) north of the north edge of the sidewalk, and
level with the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  5

                                                   PUBLICATION DATE:  07/23/1987
Station ID: 8722548                                SUPERCEDED DATE:   04/21/2003
Name:       PGA BOULEVARD BRIDGE, INTRACOASTAL WATERWAY       
            FLORIDA
NOAA Chart: 11466                                  Latitude:         26° 50.6' N
USGS Quad:  RIVIERA BEACH                          Longitude:        80°  4.0' W


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


                         BENCH MARK STAMPING:  2548 G 1981

MONUMENTATION:           Survey Disk                               VM#:     5589
AGENCY:                                                            PID#:  AD6294
SETTING CLASSIFICATION:  Concrete Bridge Rail


The bench mark is set in the concrete bridge rail, 30 feet (9 m) north of the
centerline of the new PGA Boulevard Bridge, 2.5 feet (0.8 m) west of the NE
corner of the new bridge, and 4 feet (1 m) above the highway.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  5

                                                   PUBLICATION DATE:  07/23/1987
Station ID: 8722548                                SUPERCEDED DATE:   04/21/2003
Name:       PGA BOULEVARD BRIDGE, INTRACOASTAL WATERWAY       
            FLORIDA
NOAA Chart: 11466                                  Latitude:         26° 50.6' N
USGS Quad:  RIVIERA BEACH                          Longitude:        80°  4.0' W


                            T I D A L   D A T U M S 


Tidal datums at PGA BOULEVARD BRIDGE, INTRACOASTAL WATERWAY based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           FEBRUARY-MARCH 1973
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8722557 NORTH PALM BEACH


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

     HIGHEST OBSERVED WATER LEVEL (02/14/1973)         =   3.86
     MEAN HIGHER HIGH WATER                     MHHW   =   3.05
     MEAN HIGH WATER                            MHW    =   2.87
     MEAN TIDE LEVEL                            MTL    =   1.53
     MEAN LOW WATER                             MLW    =   0.19
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (04/05/1973)         =  -0.71

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     NO 4 1973                                   6.12      3.25
     NO 1 1973                                   6.28      3.41
     NO 3 1973                                   6.14      3.27
     NO 5 1973                                   6.20      3.33
     2548 F 1981 BSM                             5.45      2.58
     2548 G 1981                                31.56     28.69


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  5

                                                   PUBLICATION DATE:  07/23/1987
Station ID: 8722548                                SUPERCEDED DATE:   04/21/2003
Name:       PGA BOULEVARD BRIDGE, INTRACOASTAL WATERWAY       
            FLORIDA
NOAA Chart: 11466                                  Latitude:         26° 50.6' N
USGS Quad:  RIVIERA BEACH                          Longitude:        80°  4.0' 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.

Return to Top
Products available at 8722548 PGA Boulevard Bridge, Palm Beach, FL