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Bench Mark Sheet for 8723769, PLANTATION KEY, ATLANTIC SIDE 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  5

                                                                                
Station ID: 8723769                         PUBLICATION DATE:  02/26/2004
Name:       PLANTATION KEY, ATLANTIC SIDE                     
            FL
NOAA Chart: 11463                           Latitude:   24° 58.4' N (  24.97330)
USGS Quad:  PLANTATION KEY                  Longitude:  80° 33.0' W ( -80.55000)


To reach the tidal bench marks from Coral Shores High School on U.S. Highway 1
in Plantation, proceed 1.6 km (1.0 mi) SW on U.S. Highway 1 to Schooner Bay
Road, then turn left and proceed SE on Schooner Bay Road for 0.08 km (0.05 mi)
to Freeland Road (Old U.S. Highway 1), then turn right and proceed SW on
Freeland Raod for 1.1 km (0.7 mi) to Aregood Lane, then turn left and proceed SE
on Aregood Lane for 0.3 km (0.2 mi) to its end at a private residence.  The
bench marks are located in the area around the private residence and along
Freeland Road.  The tide gage and staff were located on a pier member at the
private residence.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1975
                         DESIGNATION:          872 3769 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:         6025
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0928
SETTING CLASSIFICATION:  Concrete patio                        OPUS PID:        
LATITUDE:   24° 58.4' N (  24.97330)          LONGITUDE:  80° 33.1' W ( -80.55170)


The primary bench mark is a disk set in the concrete patio adjoining the north
basin sea wall, 28 m (93 ft) east of the east corner of the house, and 0.76 m
(2.5 ft) SW of the north edge of the patio.

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

                                                                                
Station ID: 8723769                         PUBLICATION DATE:  02/26/2004
Name:       PLANTATION KEY, ATLANTIC SIDE                     
            FL
NOAA Chart: 11463                           Latitude:   24° 58.4' N (  24.97330)
USGS Quad:  PLANTATION KEY                  Longitude:  80° 33.0' W ( -80.55000)


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


                         BENCH MARK STAMPING:  NO 2 1975
                         DESIGNATION:          872 3769 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:         6026
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0927
SETTING CLASSIFICATION:  Concrete base                         OPUS PID:        
LATITUDE:   24° 58.4' N (  24.97330)          LONGITUDE:  80° 33.1' W ( -80.55170)


The bench mark is a disk set flush in a concrete base used as a boat davit, 17 m
(55 ft) SW of bench mark NO 1 1975, 1.68 m (5.5 ft) east of a utility shed, 1.46
m (4.8 ft) NE of the boat ramp, and 1 m (2 ft) above ground.



                         BENCH MARK STAMPING:  3769 D 1982
                         DESIGNATION:          872 3769 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6028
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0925
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   24° 58.5' N (  24.97500)          LONGITUDE:  80° 33.2' W ( -80.55330)


The bench mark is a disk set in a concrete foundation, 0.2 km (0.1 mi) NE of
bench mark 3769 F 1982, 9.30 m (30.5 ft) SE of a chainlink fence, 4.57 m (15.0
ft) NW of the centerline of Freeland Road, and 0.76 m (2.5 ft) south of the
center of a manhole.

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

                                                                                
Station ID: 8723769                         PUBLICATION DATE:  02/26/2004
Name:       PLANTATION KEY, ATLANTIC SIDE                     
            FL
NOAA Chart: 11463                           Latitude:   24° 58.4' N (  24.97330)
USGS Quad:  PLANTATION KEY                  Longitude:  80° 33.0' W ( -80.55000)


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


                         BENCH MARK STAMPING:  3769 E 1982
                         DESIGNATION:          872 3769 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6029
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0929
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   24° 58.2' N (  24.97000)          LONGITUDE:  80° 33.4' W ( -80.55670)


The bench mark is a disk set in a concrete foundation, 0.2 km (0.1 mi) SW of
bench mark 3769 F 1982, 26 m (84 ft) NNW of a power pole, 5.58 m (18.3 ft) NW of
the centerline of Freeland Road, and 0.82 m (2.7 ft) WSW of the center of a
manhole cover.



                         BENCH MARK STAMPING:  3769 F 1982
                         DESIGNATION:          872 3769 F TIDAL

MONUMENTATION:           Bench Mark disk                       VM#:         6030
AGENCY:                  Florida Department of Natural Resources
                         (FDNR)                                IDB PID#:  AA0926
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   24° 58.4' N (  24.97330)          LONGITUDE:  80° 33.2' W ( -80.55330)


The bench mark is a disk set in the NE corner of a 4 m x 3 m (12 ft x 11 ft)
concrete foundation, 12 m (39 ft) WSW of the intersection of Freeland Road, 8.53
m (28.0 ft) east of the south corner of a chainlink fence, and 4.27 m (14.0 ft)
NW of the centerline of Freeland Road.

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

                                                                                
Station ID: 8723769                         PUBLICATION DATE:  02/26/2004
Name:       PLANTATION KEY, ATLANTIC SIDE                     
            FL
NOAA Chart: 11463                           Latitude:   24° 58.4' N (  24.97330)
USGS Quad:  PLANTATION KEY                  Longitude:  80° 33.0' W ( -80.55000)


                            T I D A L   D A T U M S 


Tidal datums at PLANTATION KEY, ATLANTIC SIDE based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           July 1975 - July 1975
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8723747 TAVERNIER HAWK CHANNEL


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.752
     MEAN HIGH WATER                            MHW    =  0.711
     North American Vertical Datum              NAVD88 =  0.661
     MEAN SEA LEVEL                             MSL    =  0.391
     MEAN TIDE LEVEL                            MTL    =  0.385
     MEAN LOW WATER                             MLW    =  0.059
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1975                                   1.637    0.926
     NO 2 1975                                   1.749    1.038
     3769 D 1982                                 4.003    3.292
     3769 E 1982                                 3.512    2.801
     3769 F 1982                                 4.187    3.476


Foot Notes:

Bench marks 3769 D 1982, 3769 E 1982 and 3769 F 1982 are based on one
differential leveling connection and do not meet the quality control standards
of the NOS. Therefore, caution should be used when deriving elevations for these
marks.

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

                                                                                
Station ID: 8723769                         PUBLICATION DATE:  02/26/2004
Name:       PLANTATION KEY, ATLANTIC SIDE                     
            FL
NOAA Chart: 11463                           Latitude:   24° 58.4' N (  24.97330)
USGS Quad:  PLANTATION KEY                  Longitude:  80° 33.0' W ( -80.55000)


                             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 8723769 PLANTATION KEY, ATLANTIC SIDE, FL

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