Superseded Bench Mark Sheet for 8720409, JULINGTON CREEK FL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:  06/26/1985
Station ID: 8720409                                SUPERCEDED DATE:   04/21/2003
Name:       JULINGTON CREEK                                   
            FLORIDA
NOAA Chart: 11491                                  Latitude:         30°  8.1' N
USGS Quad:  ORANGE PARK                            Longitude:        81° 37.8' W


To reach the tidal bench marks from the intersection of Interstate 295 and State
Road 13 proceed 3.4 miles (5.4 km) south along State Road 13 to Reitman Marina. 
The bench marks are located in the vicinity of State Road 13 and the concrete
bridge over Julington Creek.  The tide gage and staff were located on the marina
dock.


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


                 PRIMARY BENCH MARK STAMPING:  0409 A 1978

MONUMENTATION:           Survey Disk                               VM#:     5182
AGENCY:                                                            PID#:  BC1539
SETTING CLASSIFICATION:  Concrete Post


The bench mark is set atop a concrete post, 113 feet (34 m) SE of a double
utility pole, 93 feet (28 m) south of Julington Creek Seafood Restaurant sign,
and 12 feet (4 m) NW of the entrance to Reitman Marina.



                         BENCH MARK STAMPING:  0409 C 1978

MONUMENTATION:           Survey Disk                               VM#:     5183
AGENCY:                                                            PID#:  BC1536
SETTING CLASSIFICATION:  Concrete Headwall


The bench mark is set in a concrete headwall, 180 feet (55 m) south of the
intersection of Westberry Road and State Road 13, 30 feet (9 m) NE of the
flagpole in front of the Ace Hardware store, 21 feet (6 m) west of the
centerline of State Road 13, and 4 feet (1 m) north of a witness post.

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

                                                   PUBLICATION DATE:  06/26/1985
Station ID: 8720409                                SUPERCEDED DATE:   04/21/2003
Name:       JULINGTON CREEK                                   
            FLORIDA
NOAA Chart: 11491                                  Latitude:         30°  8.1' N
USGS Quad:  ORANGE PARK                            Longitude:        81° 37.8' W


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


                         BENCH MARK STAMPING:  0409 E 1982

MONUMENTATION:           Survey Disk                               VM#:     5184
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Headwall


The bench mark is set in the concrete headwall, 139.0 feet (42.4 m) north of the
centerline of Julington Creek Road, 58.5 feet (17.8 m) west of the center of the
double doors to American Federal Savings and Loan, 28.0 feet (8.5 m) east of the
centerline of State Road 13, and 3.5 feet (1.1 m) south of the north end of the
culvert headwall.



                         BENCH MARK STAMPING:  JC 3 1978 C.L.B.

MONUMENTATION:           Survey Disk                               VM#:     5185
AGENCY:                                                            PID#:  BC1535
SETTING CLASSIFICATION:  Concrete Headwall


The bench mark is set in a concrete headwall, 345 feet (105 m) south of the
intersection of State Road 13 and Marbon Road, 130.5 feet (39.8 m) SE of a
utility pole, and 21 feet (6 m) east of the centerline of State Road 13.



                         BENCH MARK STAMPING:  NO STAMPING 1

MONUMENTATION:           Survey Disk                               VM#:     5186
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Guardrail


The bench mark is set in the top of the concrete guardrail at the NW bridge
corner, 19 feet (6 m) SW of the centerline of the highway.

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

                                                   PUBLICATION DATE:  06/26/1985
Station ID: 8720409                                SUPERCEDED DATE:   04/21/2003
Name:       JULINGTON CREEK                                   
            FLORIDA
NOAA Chart: 11491                                  Latitude:         30°  8.1' N
USGS Quad:  ORANGE PARK                            Longitude:        81° 37.8' W


                            T I D A L   D A T U M S 


Tidal datums at JULINGTON CREEK based on:

     LENGTH OF SERIES:      6 MONTHS
     TIME PERIOD:           MAY-OCTOBER 1978
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8720496 GREEN COVE SPRINGS


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

     HIGHEST OBSERVED WATER LEVEL (11/04/1978)         =   2.07
     MEAN HIGHER HIGH WATER                     MHHW   =   0.83
     MEAN HIGH WATER                            MHW    =   0.78
     MEAN TIDE LEVEL                            MTL    =   0.43
     MEAN LOW WATER                             MLW    =   0.07
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (07/30/1978)         =  -0.67

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     0409 A 1978                                 4.47      3.69
     0409 C 1978                                15.97     15.19
     0409 E 1982                                10.41      9.63
     JC 3 1978 C.L.B.                           20.08     19.30
     NO STAMPING 1                              14.19     13.41


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

                                                   PUBLICATION DATE:  06/26/1985
Station ID: 8720409                                SUPERCEDED DATE:   04/21/2003
Name:       JULINGTON CREEK                                   
            FLORIDA
NOAA Chart: 11491                                  Latitude:         30°  8.1' N
USGS Quad:  ORANGE PARK                            Longitude:        81° 37.8' 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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