Bench Mark Sheet for 8720242, Longbranch 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Superseded Epoch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Small blue map location marker Unpublished bench mark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 10

                                                                                
Station ID: 8720242                         PUBLICATION DATE:  03/25/2010
Name:       LONGBRANCH (USE-DDP), ST JOHNS RIVER              
            FL
NOAA Chart: 11488                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  ARLINGTON                       Longitude:  81° 37.2' W ( -81.62000)


To reach the tidal bench marks from the intersection of U. S. Highway 17 and U.
S. Highway Alternate 1, proceed east on U. S. Highway Alternate 1 (21st Street)
to Talleyrand Avenue, then turn right and proceed south on Talleyrand Avenue to
the entrance of the Army Corp of Engineers Depot. The bench marks are on the
Depot property. The tide station was located on the concrete bulkhead on the
north side of the boat basin.


                         T I D A L   B E N C H   M A R K S
                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of 10

                                                                                
Station ID: 8720242                         PUBLICATION DATE:  03/25/2010
Name:       LONGBRANCH (USE-DDP), ST JOHNS RIVER              
            FL
NOAA Chart: 11488                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  ARLINGTON                       Longitude:  81° 37.2' W ( -81.62000)


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


                 PRIMARY BENCH MARK STAMPING:  STJO 204 1973 RPS JAX FLA
                         DESIGNATION:          STJO 204

MONUMENTATION:           Survey disk                           VM#:         5129
AGENCY:                  US Army Corps of Engineers (USE)      IDB PID#:  BC1572
SETTING CLASSIFICATION:  Concrete bulkhead                     OPUS PID#: BC1572
LATITUDE:   30° 21.4' N (  30.35722)          LONGITUDE:  81° 37.3' W ( -81.62083)


The primary bench mark is a disk set in a concrete bulkhead in the NE corner of
the boat slip, 17.3 m (56.7 ft) SE of the NW corner of a chain link fence, 10.4
m (34.0 ft) SW of the NW end of the boat slip, and 1.6 m (5.3 ft) south of a
chain link fence.



                         BENCH MARK STAMPING:  NO 4 1928
                         DESIGNATION:          872 0242 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:         5126
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BC0354
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   30° 21.3' N (  30.35500)          LONGITUDE:  81° 37.5' W ( -81.62528)


The bench mark is a disk set near the east corner of the concrete footing of the
SE leg for a water tank (tank removed) at the SW angle of the intersection of
Talleyrand Avenue and East 18th Street, just south of Fire Station #11, 44.0 m
(144.4 ft) south of the approximate center of 18th Street, 12.7 m (41.7 ft) west
of and level with the centerline of the southbound lanes of Talleyrand Avenue,
5.6 m (18.4 ft) south of the SE corner of a storage room at Fire Station #11,
0.3 m (1.0 ft) east of a chainlink fence, and 21.3 cm (0.7 ft) above ground
level.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of 10

                                                                                
Station ID: 8720242                         PUBLICATION DATE:  03/25/2010
Name:       LONGBRANCH (USE-DDP), ST JOHNS RIVER              
            FL
NOAA Chart: 11488                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  ARLINGTON                       Longitude:  81° 37.2' W ( -81.62000)


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


                         BENCH MARK STAMPING:  D 142 1954
                         DESIGNATION:          D 142

MONUMENTATION:           Bench Mark disk                       VM#:         5127
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  BC0350
SETTING CLASSIFICATION:  Building                              OPUS PID:        
LATITUDE:   30° 21.2' N (  30.35389)          LONGITUDE:  81° 38.4' W ( -81.63917)


The bench mark is a disk set vertically in the north face of the NW corner of J.
Allen Axon Elementary School (Public School Number 8) located at the SE corner
of East 17th Street and Franklin Street, 12.2 m (40.0 ft) south of the
approximate center of East 17th Street, 11.0 m (36.1 ft) west of the approximate
center of Franklin Street, and 0.3 m (1.0 ft) above ground level.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of 10

                                                                                
Station ID: 8720242                         PUBLICATION DATE:  03/25/2010
Name:       LONGBRANCH (USE-DDP), ST JOHNS RIVER              
            FL
NOAA Chart: 11488                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  ARLINGTON                       Longitude:  81° 37.2' W ( -81.62000)


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


                         BENCH MARK STAMPING:  STJO 175 RPS 1973 FLA
                         DESIGNATION:          STJO 175

MONUMENTATION:           Survey disk                           VM#:         5128
AGENCY:                  US Army Corps of Engineers (USE)      IDB PID#:  BC1569
SETTING CLASSIFICATION:  Concrete dock                         OPUS PID:        
LATITUDE:   30° 21.4' N (  30.35611)          LONGITUDE:  81° 37.2' W ( -81.61972)


The bench mark is a disk set in the top of a concrete dock located on the
grounds of the Army Corp of Engineers Depot, 69.5 m (228.0 ft) east of the west
corner of a chainlink fence, 4.6 m (15.1 ft) east of a large metal cleat on the
edge of the shipping dock, and 2.3 m (7.4 ft) south of the north corner of the
docking pier.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of 10

                                                                                
Station ID: 8720242                         PUBLICATION DATE:  03/25/2010
Name:       LONGBRANCH (USE-DDP), ST JOHNS RIVER              
            FL
NOAA Chart: 11488                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  ARLINGTON                       Longitude:  81° 37.2' W ( -81.62000)


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


                         BENCH MARK STAMPING:  STJO 205 1973 JAX FLA
                         DESIGNATION:          STJO 205

MONUMENTATION:           Survey disk                           VM#:         5130
AGENCY:                  US Army Corps of Engineers (USE)      IDB PID#:  BC1571
SETTING CLASSIFICATION:  Concrete bulkhead                     OPUS PID:        
LATITUDE:   30° 21.4' N (  30.35667)          LONGITUDE:  81° 37.3' W ( -81.62111)


The bench mark is a disk set in the top of a concrete bulkhead at the SE corner
of the boat slip, 21.2 m (69.5 ft) SE of a flagpole, 3.2 m (10.5 ft) SE of the
NE corner of a chainlink fence, and 0.2 m (0.7 ft) north of the southernmost tip
of the west side of the boat slip.



                         BENCH MARK STAMPING:  0242 A 1995
                         DESIGNATION:          872 0242 A

MONUMENTATION:           Flange-encased Rod                    VM#:         5131
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID#: BBBZ31
LATITUDE:   30° 21.8' N (  30.36250)          LONGITUDE:  81° 37.3' W ( -81.62167)


The bench mark is a flanged-encased rod, located 56.3 m (184.7 ft) east of the
NE corner of the Army Corp of Engineers warehouse building, 22.5 m (73.7 ft)
east of bench mark STJO 204 RPS 1973 JAX FLA, 9.9 m (32.4 ft) east of the east
corner of a 1.8 m (6.0 ft) tall chainlink fence, 4.1 m (13.3 ft) west of the
east end of the north side seawall, and 0.5 m (1.5 ft) north of the north side
of the sea wall.  The datum point is recessed 12.2 cm (0.4 ft) below the 5-inch
NGS logo cap, being the top of a stainless steel rod driven to refusal at a
depth of 14.3 m (46.8 ft) encased in a 5-inch NGS logo cap flush with the
ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of 10

                                                                                
Station ID: 8720242                         PUBLICATION DATE:  03/25/2010
Name:       LONGBRANCH (USE-DDP), ST JOHNS RIVER              
            FL
NOAA Chart: 11488                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  ARLINGTON                       Longitude:  81° 37.2' W ( -81.62000)


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


                         BENCH MARK STAMPING:  0242 B 1995
                         DESIGNATION:          872 0242 B TIDAL

MONUMENTATION:           Flange-encased Rod                    VM#:         5134
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DI9224
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   30° 21.6' N (  30.36083)          LONGITUDE:  81° 37.9' W ( -81.63222)


The bench mark is a flange-encased rod located near the intersection of the 19th
Street and Talleyrand Avenue, 19.8 m (65.0 ft) west of the approximate center of
Talleyrand Avenue, 7.6 m (25.0 ft) north of the approximate center of East 19th
Street, 3.6 m (11.9 ft) NE of the center of a 1.2 m x 1.5 m (4.0 ft x 5.0 ft)
storm water drain, 0.3 m (1.1 ft) south of a 1.8 m (6.0 ft) tall chainlink fence
line, and 0.3 m (1.0 ft) south of a carsonite witness post.  The datum point is
recessed 12.2 cm (0.4 ft) below the 5-inch NGS logo cap, being at the top of a
stainless steel rod driven to refusal at a depth of 20.1 m (66.0 ft) encased in
a 5-inch NGS logo cap flush with the ground.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of 10

                                                                                
Station ID: 8720242                         PUBLICATION DATE:  03/25/2010
Name:       LONGBRANCH (USE-DDP), ST JOHNS RIVER              
            FL
NOAA Chart: 11488                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  ARLINGTON                       Longitude:  81° 37.2' W ( -81.62000)


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


                         BENCH MARK STAMPING:  STJO 215 1973 JAX FL
                         DESIGNATION:          STJO 215

MONUMENTATION:           Survey disk                           VM#:         5138
AGENCY:                  US Army Corps of Engineers (USE)      IDB PID#:  BC1568
SETTING CLASSIFICATION:  Concrete apron                        OPUS PID:        
LATITUDE:   30° 21.4' N (  30.35611)          LONGITUDE:  81° 37.3' W ( -81.62083)


The bench mark is a disk set in the top of a concrete apron located along
waterfront, 27.4 m (89.8 ft) SE of the NE corner of the main warehouse, 26.8 m
(88.0 ft) east of a flagpole, and 1.5 m (4.9 ft) west of the east corner of a
chainlink fence.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of 10

                                                                                
Station ID: 8720242                         PUBLICATION DATE:  03/25/2010
Name:       LONGBRANCH (USE-DDP), ST JOHNS RIVER              
            FL
NOAA Chart: 11488                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  ARLINGTON                       Longitude:  81° 37.2' W ( -81.62000)


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


                         BENCH MARK STAMPING:  STJO 219 1974 JAX FLA
                         DESIGNATION:          STJO 219

MONUMENTATION:           Survey disk                           VM#:        13555
AGENCY:                  US Army Corps of Engineers (USE)      IDB PID#:  BC0355
SETTING CLASSIFICATION:  Sidewalk                              OPUS PID:        
LATITUDE:   30° 21.3' N (  30.35500)          LONGITUDE:  81° 37.5' W ( -81.62556)


The bench mark is a disk set in a sidewalk along the north side of Fire Station
#11, 17.3 m (56.8 ft) west of and level with the centerline of the southbound
lanes of Talleyrand Avenue, 16.8 m (55.1 ft) south of the approximate center of
18th Street, and 0.5 m (1.6 ft) NW of the NE corner of the Fire Station.  

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  9 of 10

                                                                                
Station ID: 8720242                         PUBLICATION DATE:  03/25/2010
Name:       LONGBRANCH (USE-DDP), ST JOHNS RIVER              
            FL
NOAA Chart: 11488                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  ARLINGTON                       Longitude:  81° 37.2' W ( -81.62000)


                            T I D A L   D A T U M S 


Tidal datums at LONGBRANCH (USE-DDP), ST JOHNS RIVER based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           March 2002 - February 2003
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8720218 BAR PILOTS DOCK, ST JOHNS RIVER


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

     HIGHEST OBSERVED WATER LEVEL (10/07/1998)         =  1.578
     MEAN HIGHER HIGH WATER                     MHHW   =  0.828
     MEAN HIGH WATER                            MHW    =  0.799
     North American Vertical Datum              NAVD88 =  0.503
     MEAN SEA LEVEL                             MSL    =  0.418
     MEAN TIDE LEVEL                            MTL    =  0.416
     MEAN LOW WATER                             MLW    =  0.033
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/10/1996)         = -1.761

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     STJO 204 1973 RPS JAX FLA                   1.549    0.750
     NO 4 1928                                   3.730    2.931
     D 142 1954                                  6.567    5.768
     STJO 175 RPS 1973 FLA                       2.279    1.480
     STJO 205 1973 JAX FLA                       1.518    0.719
     0242 A 1995                                 1.892    1.093
     0242 B 1995                                 2.905    2.106
     STJO 215 1973 JAX FL                        2.462    1.663
     STJO 219 1974 JAX FLA                       3.684    2.885


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page 10 of 10

                                                                                
Station ID: 8720242                         PUBLICATION DATE:  03/25/2010
Name:       LONGBRANCH (USE-DDP), ST JOHNS RIVER              
            FL
NOAA Chart: 11488                           Latitude:   30° 21.6' N (  30.36000)
USGS Quad:  ARLINGTON                       Longitude:  81° 37.2' W ( -81.62000)


                             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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