Bench Mark Sheet for 8720274, LITTLE POTTSBURG CREEK FL

Superseded Epoch

Large map location marker Station Location
Small red map location marker Published bench mark
Small blue map location marker Unpublished bench mark

Bench mark positions only appear on the map if their coordinates in the CO-OPS database are at the precision of degrees/minutes/seconds/and tenths of seconds. If the coordinates are less precise, the mark will not appear.

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  7

                                                                                
Station ID: 8720274                         PUBLICATION DATE:  11/10/2010
Name:       LITTLE POTTSBURG CREEK                            
            FL
NOAA Chart: 11491                           Latitude:   30° 18.6' N (  30.31000)
USGS Quad:  ARLINGTON                       Longitude:  81° 36.6' W ( -81.61000)


To reach the bench marks from the intersection of University Boulevard and
Atlantic Boulevard in Jacksonville, proceed west along Atlantic Boulevard for
1.0 km (0.6 mi) to the concrete bridge over Little Pottsburg Creek.  The bench
marks are along the east bank of Little Pottsburg Creek.  The tide station was
located on the second set of concrete bridge supports on the north side of the
bridge along the east shore of Little Pottsburg Creek.


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


                 PRIMARY BENCH MARK STAMPING:  0274 A 1978
                         DESIGNATION:          872 0274 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10708
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BC1400
SETTING CLASSIFICATION:  Concrete bridge abutment              OPUS PID:        
LATITUDE:   30° 18.7' N (  30.31083)          LONGITUDE:  81° 36.5' W ( -81.60889)


The primary bench mark is a disk set flush in the top of the concrete sidewalk
at the eastern end of the concrete bridge over Little Pottsburg Creek, 8.5 m
(28.0 ft) north of the centerline of the west bound lane of Atlantic Boulevard,
2.1 m (6.8 ft) west of power pole No. 5453, 1.5 m (5.0 ft) NE of the concrete
guard rail along the northerly edge of the westbound lanes of Atlantic
Boulevard, and 0.3 m (1.0 ft) south of the NE corner of the bridge.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                                                
Station ID: 8720274                         PUBLICATION DATE:  11/10/2010
Name:       LITTLE POTTSBURG CREEK                            
            FL
NOAA Chart: 11491                           Latitude:   30° 18.6' N (  30.31000)
USGS Quad:  ARLINGTON                       Longitude:  81° 36.6' W ( -81.61000)


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


                         BENCH MARK STAMPING:  0274 B 1978
                         DESIGNATION:          872 0274 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:        10709
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  BC1399
SETTING CLASSIFICATION:  Concrete steps                        OPUS PID#: BC1399
LATITUDE:   30° 18.7' N (  30.31139)          LONGITUDE:  81° 36.4' W ( -81.60583)


The bench mark is a disk set flush in the top of the bottom step to St. Pauls
Episcopal Church at 5616 Atlantic Boulevard, 1.4 m (4.5 ft) south of the south
edge of the 1.5 m (5.0 ft) concrete sidewalk on the south side of Atlantic
Boulevard (a six lane highway) 0.5 m (1.8 ft) south of a 0.9 m (3.0 ft) tall
concrete retaining wall, and 3.5 m (11.5 ft) east of the south projection
centerline of Campbell Road on the north side of Atlantic Boulevard.



                         BENCH MARK STAMPING:  NO 3 1939
                         DESIGNATION:          872 0274 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:        10712
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BC1398
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   30° 18.9' N (  30.31444)          LONGITUDE:  81° 36.6' W ( -81.60944)


The bench mark is a disk set in the top of a round concrete post, recessed 0.9 m
(0.3 ft) below ground level, on the edge of a bamboo thicket, 11.4 m (37.5 ft)
NE of bench mark No. 2 1939, 4.3 m (14.0 ft) SW of the centerline of the
driveway to the house at 1101 Campbell Road, 3.4 m (11.0 ft) SW of the SW corner
of the concrete pillar at the west side of the driveway to the residence, 7.3 m
(24.0 ft) SW of the SW corner of the eastern most concrete pillar, and 1.2 m
(4.0 ft) SE of the corner post of a wooden fence, and recessed 0.9 m (0.3 ft)
below ground level.  NOTE:  A magnet was buried at the south side of the
monument.    

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                                                
Station ID: 8720274                         PUBLICATION DATE:  11/10/2010
Name:       LITTLE POTTSBURG CREEK                            
            FL
NOAA Chart: 11491                           Latitude:   30° 18.6' N (  30.31000)
USGS Quad:  ARLINGTON                       Longitude:  81° 36.6' W ( -81.61000)


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


                         BENCH MARK STAMPING:  0274 C 2004
                         DESIGNATION:          872 0274 C TIDAL

MONUMENTATION:           Flange-encased Rod                    VM#:        19333
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  DI0247
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 18.6' N (  30.31000)          LONGITUDE:  81° 36.6' W ( -81.61083)


The bench mark is a flange-encased rod located 15.8 m (51.7 ft) NW of a wooden
light pole No. 1639, 15.2 m (50.0 ft) SE of the southerly edge of a 1.5 m (5.0
ft) wide concrete sidewalk along the southerly side of Atlantic Boulevard, 4.6 m
(15.0 ft) SW of the center of Brookside Circle West, 0.8 m (2.7 ft) NE of a 1.2
m (4.0 ft) high wooden fence and 0.6 m (2.0 ft) NE of a carsonite witness post. 
The datum point is recessed 0.1 m (0.2 ft) below the level of the NGS logo cap,
being the top of a stainless steel rod, driven to refusal at a depth of 18.3 m
(60.0 ft) encased in a 5-inch NGS logo cap flush with the ground.  NOTE:  A
magnet was buried at the south side of the mark.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                                                
Station ID: 8720274                         PUBLICATION DATE:  11/10/2010
Name:       LITTLE POTTSBURG CREEK                            
            FL
NOAA Chart: 11491                           Latitude:   30° 18.6' N (  30.31000)
USGS Quad:  ARLINGTON                       Longitude:  81° 36.6' W ( -81.61000)


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


                         BENCH MARK STAMPING:  DUV 31 1983 BSM
                         DESIGNATION:          DUV 31

MONUMENTATION:           Bench Mark disk                       VM#:        19334
AGENCY:                  FL Department of Natural Resources
                         (FLDNR)                               IDB PID#:  DI0246
SETTING CLASSIFICATION:  Concrete bridge rail                  OPUS PID:        
LATITUDE:   30° 18.3' N (  30.30500)          LONGITUDE:  81° 38.1' W ( -81.63528)


The bench mark is a disk set flush in the top of the guard rail near the NE
corner of the bridge over Beach Boulevard, 18.9 m (62.0 ft) south of the
centerline of the eastbound lane of Atlantic Boulevard, 10.0 m (32.8 ft) ESE of
the easterly bridge abutment, 5.3 m (17.5 ft) NNE of the centerline of the
westbound lane of Beach Boulevard and 0.6 m (2.1 ft) WSW of the east end of the
guardrail.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                                                
Station ID: 8720274                         PUBLICATION DATE:  11/10/2010
Name:       LITTLE POTTSBURG CREEK                            
            FL
NOAA Chart: 11491                           Latitude:   30° 18.6' N (  30.31000)
USGS Quad:  ARLINGTON                       Longitude:  81° 36.6' W ( -81.61000)


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


                         BENCH MARK STAMPING:  DUV 32 1983 BSM
                         DESIGNATION:          DUV 32

MONUMENTATION:           Bench Mark disk                       VM#:        19335
AGENCY:                  FL Department of Natural Resources
                         (FLDNR)                               IDB PID#:  DI0245
SETTING CLASSIFICATION:  Concrete walkway                      OPUS PID:        
LATITUDE:   30° 18.5' N (  30.30833)          LONGITUDE:  81° 37.2' W ( -81.61972)


The bench mark is a disk set flush in the east walkway over the north abutment
of the northbound bridge over Atlantic Boulevard, 8.4 m (27.7 ft) north of the
centerline of the northbound lanes of U.S. Alternate Highway 1, and 2.7 m (9.0
ft) south of the north end of the bridge guardrail.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                                                
Station ID: 8720274                         PUBLICATION DATE:  11/10/2010
Name:       LITTLE POTTSBURG CREEK                            
            FL
NOAA Chart: 11491                           Latitude:   30° 18.6' N (  30.31000)
USGS Quad:  ARLINGTON                       Longitude:  81° 36.6' W ( -81.61000)


                            T I D A L   D A T U M S 


Tidal datums at LITTLE POTTSBURG CREEK based on:

     LENGTH OF SERIES:      5 MONTHS
     TIME PERIOD:           July 1978 - November 1978
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8720220 MAYPORT (FERRY DEPOT), SAINT JOHNS RIVER


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.673
     MEAN HIGH WATER                            MHW    =  0.641
     North American Vertical Datum              NAVD88 =  0.370
     MEAN TIDE LEVEL                            MTL    =  0.333
     MEAN SEA LEVEL                             MSL    =  0.327
     MEAN LOW WATER                             MLW    =  0.024
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     0274 A 1978                                 4.388    3.747
     0274 B 1978                                 6.442    5.801
     NO 3 1939                                   2.535    1.894
     0274 C 2004                                 6.038    5.397
     DUV 31 1983 BSM                            11.020   10.379
     DUV 32 1983 BSM                            15.147   14.506


Foot Notes:

Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality control
standards for Second Order, Class 1 leveling.  It is advised that a confirmation
set of levels be established for bench marks 0274 C 2004, DUV 31 1983 BSM, DUV
32 1983 BSM, and NO 2 1939 to verify height differences before using tidal bench
mark elevation information.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  7

                                                                                
Station ID: 8720274                         PUBLICATION DATE:  11/10/2010
Name:       LITTLE POTTSBURG CREEK                            
            FL
NOAA Chart: 11491                           Latitude:   30° 18.6' N (  30.31000)
USGS Quad:  ARLINGTON                       Longitude:  81° 36.6' W ( -81.61000)


                             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 NGS's Integrated Data Base (IDB PID)
provides geodetic datum based on traditionally leveled and bluebooked ties to
the National Spatial Reference System(NSRS) https://www.ngs.noaa.gov/datasheets/.
The NGS Online Positioning User Service (OPUS PID) provides geodetic datum based
on GPS position & tie it to the NSRS https://www.ngs.noaa.gov/OPUS/.

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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