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Bench Mark Sheet for 8724231, BIG PINE KEY NORTH END 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  8

                                                                                
Station ID: 8724231                         PUBLICATION DATE:  04/01/2004
Name:       BIG PINE KEY NORTH END                            
            FL
NOAA Chart: 11448                           Latitude:   24° 44.7' N (  24.74500)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 23.7' W ( -81.39500)


To reach the tidal bench marks from the post office in Marathon, proceed SW on
U.S. Highway 1 for 30.7 km (19.1 mi) to Big Pine Key, then turn right and
proceed NW on State Highway 940 (Key Deer Boulevard) for 7.2 km (4.5 mi), then
north onto a dim track road for 2.4 km (1.5 mi) to the north end of Big Pine
Key.  The bench marks are located in a clearing at the north tip of the Key. 
The tide gage and staff were located offshore, north of the north tip, SE of
channel marker No. 26.


                         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  8

                                                                                
Station ID: 8724231                         PUBLICATION DATE:  04/01/2004
Name:       BIG PINE KEY NORTH END                            
            FL
NOAA Chart: 11448                           Latitude:   24° 44.7' N (  24.74500)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 23.7' W ( -81.39500)


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


                 PRIMARY BENCH MARK STAMPING:  PINEY RM 1 1935
                         DESIGNATION:          PINEY RM 1
                         ALIAS:                2

MONUMENTATION:           Reference Mark disk                   VM#:        11347
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AA0223
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   24° 44.6' N (  24.74330)          LONGITUDE:  81° 23.7' W ( -81.39500)


The primary bench mark is a disk set flush in a concrete monument, 34 m (110 ft)
NW of the centerline of the track road, 24 m (78 ft) NE of bench mark PINEY
1935, and 0.15 m (0.5 ft) above the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  8

                                                                                
Station ID: 8724231                         PUBLICATION DATE:  04/01/2004
Name:       BIG PINE KEY NORTH END                            
            FL
NOAA Chart: 11448                           Latitude:   24° 44.7' N (  24.74500)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 23.7' W ( -81.39500)


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


                         BENCH MARK STAMPING:  PINEY 1935
                         DESIGNATION:          PINEY
                         ALIAS:                1

MONUMENTATION:           Triangulation Station disk            VM#:        11346
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AA0222
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   24° 44.6' N (  24.74330)          LONGITUDE:  81° 23.7' W ( -81.39500)


The bench mark is a disk set flush in a concrete monument, 201 m (660 ft) SE of
the north point of Big Pine Key, 70 m (231 ft) west of the edge of mangroves
along the east shore, 60 m (198 ft) east of the edge of mangroves along the west
shore, 41 m (135 ft) NW of the centerline of the track road, 0.40 m (1.3 ft) NE
of a witness post, and 0.15 m (0.5 ft) above the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  8

                                                                                
Station ID: 8724231                         PUBLICATION DATE:  04/01/2004
Name:       BIG PINE KEY NORTH END                            
            FL
NOAA Chart: 11448                           Latitude:   24° 44.7' N (  24.74500)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 23.7' W ( -81.39500)


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


                         BENCH MARK STAMPING:  PINEY RM 2 1935
                         DESIGNATION:          PINEY RM 2
                         ALIAS:                3

MONUMENTATION:           Reference Mark disk                   VM#:        11348
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AA0221
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   24° 44.6' N (  24.74330)          LONGITUDE:  81° 23.7' W ( -81.39500)


The bench mark is a disk set flush in a concrete monument, 36.48 m (119.7 ft)
south of bench mark PINEY RM 1 1935, 32 m (105 ft) NW of the centerline of the
track road, 25 m (81 ft) SE of bench mark PINEY 1935, 0.67 m (2.2 ft) NE of a
witness post, and 0.15 m (0.5 ft) above the ground.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  8

                                                                                
Station ID: 8724231                         PUBLICATION DATE:  04/01/2004
Name:       BIG PINE KEY NORTH END                            
            FL
NOAA Chart: 11448                           Latitude:   24° 44.7' N (  24.74500)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 23.7' W ( -81.39500)


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


                         BENCH MARK STAMPING:  Q 328 1970
                         DESIGNATION:          Q 328

MONUMENTATION:           Bench Mark disk                       VM#:        11349
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AA0219
SETTING CLASSIFICATION:  Rock outcrop                          OPUS PID:        
LATITUDE:   24° 44.6' N (  24.74330)          LONGITUDE:  81° 23.7' W ( -81.39500)


The bench mark is a disk set in the top of outcropping bedrock, 10.52 m (34.5
ft) east of bench mark R 328 1970, 4.72 m (15.5 ft) NE of the centerline of the
track road, and 1.07 m (3.5 ft) south of a metal witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  8

                                                                                
Station ID: 8724231                         PUBLICATION DATE:  04/01/2004
Name:       BIG PINE KEY NORTH END                            
            FL
NOAA Chart: 11448                           Latitude:   24° 44.7' N (  24.74500)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 23.7' W ( -81.39500)


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


                         BENCH MARK STAMPING:  R 328 1970
                         DESIGNATION:          R 328

MONUMENTATION:           Bench Mark disk                       VM#:        11350
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AA0220
SETTING CLASSIFICATION:  Outcropping bedrock                   OPUS PID:        
LATITUDE:   24° 44.6' N (  24.74330)          LONGITUDE:  81° 23.7' W ( -81.39500)


The bench mark is a disk set in the top of outcropping bedrock, 31.70 m (104.0
ft) east of bench mark PINEY RM 2 1935, 3 m (11 ft) NW of the centerline of the
track road, and 0.79 m (2.6 ft) NNW of a witness post.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  8

                                                                                
Station ID: 8724231                         PUBLICATION DATE:  04/01/2004
Name:       BIG PINE KEY NORTH END                            
            FL
NOAA Chart: 11448                           Latitude:   24° 44.7' N (  24.74500)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 23.7' W ( -81.39500)


                            T I D A L   D A T U M S 


Tidal datums at BIG PINE KEY NORTH END based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           October 1974 - November 1974
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8724580 KEY WEST


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.520
     North American Vertical Datum              NAVD88 =  0.479
     MEAN HIGH WATER                            MHW    =  0.462
     MEAN TIDE LEVEL                            MTL    =  0.263
     MEAN SEA LEVEL                             MSL    =  0.221
     MEAN LOW WATER                             MLW    =  0.063
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     PINEY RM 1 1935                             0.777    0.315
     PINEY 1935                                  0.775    0.313
     PINEY RM 2 1935                             0.848    0.386
     Q 328 1970                                  0.876    0.414
     R 328 1970                                  0.792    0.330


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

                                                                                
Station ID: 8724231                         PUBLICATION DATE:  04/01/2004
Name:       BIG PINE KEY NORTH END                            
            FL
NOAA Chart: 11448                           Latitude:   24° 44.7' N (  24.74500)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 23.7' W ( -81.39500)


                             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 8724231 BIG PINE KEY NORTH END, FL

Revised: 10/15/2013
NOAA / National Ocean Service
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