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Bench Mark Sheet for 8722496, LOXAHATCHEE RIVER LOCK 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  6

                                                                                
Station ID: 8722496                         PUBLICATION DATE:  04/18/2005
Name:       LOXAHATCHEE RIVER LOCK                            
            FL
NOAA Chart: 11474                           Latitude:   26° 56.1' N (  26.93500)
USGS Quad:  ROOD                            Longitude:  80°  8.6' W ( -80.14330)


To reach the tidal bench marks from the intersection of the FEC Railroad
crossing and State Highway 706 (West Indiantown Road) in Jupiter, proceed 4.7 km
(2.9 mi) west along Highway 706 to the bridge over Hungryland Slough.  The bench
marks are located in the area around State Highway 706.  The tide gage and staff
were located on a Flood Control District bulkhead just north of the locks.


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


                 PRIMARY BENCH MARK STAMPING:  1
                         DESIGNATION:          1 FLDT

MONUMENTATION:           Tidal Station disk                    VM#:         5567
AGENCY:                  Florida Department of Transportation
                         (FLDT)                                IDB PID#:  AD6272
SETTING CLASSIFICATION:  Concrete bridge abutment              OPUS PID:        
LATITUDE:   26° 56.0' N (  26.93330)          LONGITUDE:  80°  8.4' W ( -80.14000)


The primary bench mark is a disk set flush in the NE corner of the State Highway
706 bridge over Hungryland Slough and 0.46 m (1.5 ft) south of the north end of
the abutment wingwall.  NOTE: The wing wall has been removed.  Mark not found in
2002 & 2003 by US Power Squadron.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  6

                                                                                
Station ID: 8722496                         PUBLICATION DATE:  04/18/2005
Name:       LOXAHATCHEE RIVER LOCK                            
            FL
NOAA Chart: 11474                           Latitude:   26° 56.1' N (  26.93500)
USGS Quad:  ROOD                            Longitude:  80°  8.6' W ( -80.14330)


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


                         BENCH MARK STAMPING:  JENKINS 1970
                         DESIGNATION:          JENKINS

MONUMENTATION:           Survey disk                           VM#:         5564
AGENCY:                  Florida Department of Transportation
                         (FLDT)                                IDB PID#:  AD6275
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   26° 56.0' N (  26.93330)          LONGITUDE:  80°  8.6' W ( -80.14333)


The bench mark is a disk set in a concrete monument 69 m (227 ft) SW of the SW
corner of the State Highway 706 bridge over Hungryland Slough, 50 m (165 ft)
south of the centerline of the highway, 11 m (35 ft) NW of the west edge of the
levee, and 0.67 m (2.2 ft) east of a metal witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  6

                                                                                
Station ID: 8722496                         PUBLICATION DATE:  04/18/2005
Name:       LOXAHATCHEE RIVER LOCK                            
            FL
NOAA Chart: 11474                           Latitude:   26° 56.1' N (  26.93500)
USGS Quad:  ROOD                            Longitude:  80°  8.6' W ( -80.14330)


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


                         BENCH MARK STAMPING:  JENKINS NO 2 1970
                         DESIGNATION:          JENKINS RM 2

MONUMENTATION:           Reference Mark disk                   VM#:         5565
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AD6276
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID#: AD6276
LATITUDE:   26° 56.0' N (  26.93330)          LONGITUDE:  80°  8.6' W ( -80.14330)


The bench mark is a disk set flush in a concrete monument, 23.71 m (77.8 ft) SW
of bench mark JENKINS 1970, 17 m (57 ft) SE of the east side of a palmetto
patch, 7.16 m (23.5 ft) NW of the west edge of the levee, and 0.37 m (1.2 ft) NE
of a metal witness post.



                         BENCH MARK STAMPING:  93 79 A 20
                         DESIGNATION:          93 79 A 20 FLDT

MONUMENTATION:           Tidal Station disk                    VM#:         5566
AGENCY:                  Florida Department of Transportation
                         (FLDT)                                IDB PID#:  AD6274
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   26° 56.1' N (  26.93500)          LONGITUDE:  80°  8.4' W ( -80.14000)


The bench mark is a disk set in the top of a concrete monument, 11.55 m (37.9
ft) west of the SW corner of the State Highway 706 bridge over Hungryland
Slough, 5.39 m (17.7 ft) south of the centerline of the highway, 0.94 m (3.1 ft)
north of a guardrail, and 0.73 m (2.4 ft) north of a witness post.  NOTE: Mark
not found in 1995, 2002 and 2003 by US Power Squadron.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  6

                                                                                
Station ID: 8722496                         PUBLICATION DATE:  04/18/2005
Name:       LOXAHATCHEE RIVER LOCK                            
            FL
NOAA Chart: 11474                           Latitude:   26° 56.1' N (  26.93500)
USGS Quad:  ROOD                            Longitude:  80°  8.6' W ( -80.14330)


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


                         BENCH MARK STAMPING:  2
                         DESIGNATION:          2 FLDT

MONUMENTATION:           Tidal Station disk                    VM#:         5568
AGENCY:                  Florida State Road Department (FLSRD) IDB PID#:  AD6273
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   26° 56.1' N (  26.93500)          LONGITUDE:  80°  8.4' W ( -80.14000)


The bench mark is a disk set flush in the NW corner of State Highway 706 bridge
over Hungryland Slough, and 0.46 m (1.5 ft) south of the north end of the
abutment wingwall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  6

                                                                                
Station ID: 8722496                         PUBLICATION DATE:  04/18/2005
Name:       LOXAHATCHEE RIVER LOCK                            
            FL
NOAA Chart: 11474                           Latitude:   26° 56.1' N (  26.93500)
USGS Quad:  ROOD                            Longitude:  80°  8.6' W ( -80.14330)


                            T I D A L   D A T U M S 


Tidal datums at LOXAHATCHEE RIVER LOCK based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           December 1972 - January 1973
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8722557 NORTH PALM BEACH


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.677
     North American Vertical Datum              NAVD88 =  0.640
     MEAN HIGH WATER                            MHW    =  0.632
     MEAN SEA LEVEL                             MSL    =  0.341
     MEAN TIDE LEVEL                            MTL    =  0.341
     MEAN LOW WATER                             MLW    =  0.050
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     1                                           7.028    6.396
     JENKINS 1970                                6.701    6.069
     JENKINS NO 2 1970                           6.828    6.196
     93 79 A 20                                  6.556    5.924
     2                                           7.101    6.469


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

                                                                                
Station ID: 8722496                         PUBLICATION DATE:  04/18/2005
Name:       LOXAHATCHEE RIVER LOCK                            
            FL
NOAA Chart: 11474                           Latitude:   26° 56.1' N (  26.93500)
USGS Quad:  ROOD                            Longitude:  80°  8.6' W ( -80.14330)


                             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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Products available at 8722496 LOXAHATCHEE RIVER LOCK, FL

Revised: 08/08/2018
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services