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Bench Mark Sheet for 8723949, FAT DEER KEY 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8723949                         PUBLICATION DATE:  12/12/2003
Name:       FAT DEER KEY                                      
            FL
NOAA Chart: 11449                           Latitude:   24° 44.0' N (  24.73330)
USGS Quad:  MARATHON                        Longitude:  81°  1.0' W ( -81.01670)


To reach the tidal bench marks from the Post Office at Marathon, proceed NE on
U.S. Highway 1 for 6.6 km (4.1 mi)  to the Quay Restaurant on the north side of
the highway.  The tidal bench marks are located near the restaurant and along a
seawall, near the highway 6.1 km (3.8 mi) NE of Marathon, and near the highway
7.1 km (4.4 mi) NE of Marathon.  The tide gages and staff were located on the
sea wall north of the highway and west of the restaurant.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1975
                         DESIGNATION:          872 3949 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:         6288
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0871
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 44.0' N (  24.73330)          LONGITUDE:  81°  1.0' W ( -81.01670)


The primary bench mark is a disk set flush in the top of the concrete sea wall
along the parking lot, SW of the restaurant, 25 m (82 ft) WSW of bench mark NO 2
1975, and 1 m (2 ft) below parking lot level.



                         BENCH MARK STAMPING:  NO 2 1975
                         DESIGNATION:          872 3949 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:         6289
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0872
SETTING CLASSIFICATION:  Concrete step                         OPUS PID:        
LATITUDE:   24° 44.0' N (  24.73330)          LONGITUDE:  81°  1.0' W ( -81.01670)


The bench mark is a disk set flush in the top of the first concrete step to the
SW side entrance of the restaurant, 22.95 (75.3 ft) SE of bench mark NO 3 1975,
and 0.30 m (1.0 ft) above ground level.

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

                                                                                
Station ID: 8723949                         PUBLICATION DATE:  12/12/2003
Name:       FAT DEER KEY                                      
            FL
NOAA Chart: 11449                           Latitude:   24° 44.0' N (  24.73330)
USGS Quad:  MARATHON                        Longitude:  81°  1.0' W ( -81.01670)


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


                         BENCH MARK STAMPING:  NO 3 1975
                         DESIGNATION:          872 3949 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:         6290
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0873
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 44.0' N (  24.73330)          LONGITUDE:  81°  1.0' W ( -81.01670)


The bench mark is a disk set flush in the top of the concrete sea wall along the
east side of the boat basin, west of the restaurant, 15.76 m (51.7 ft) west of
the west corner of the restaurant, and 22.95 m (75.3 ft) NW of bench mark NO 2
1975.



                         BENCH MARK STAMPING:  NO 4 1975
                         DESIGNATION:          872 3949 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:         6291
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0874
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 44.0' N (  24.73330)          LONGITUDE:  81°  1.0' W ( -81.01670)


The bench mark is a disk set flush in the top of the concrete sea wall along the
east side of the boat basin, NW of the west corner of the restaurant, 41.64 m
(136.6 ft) west of bench mark NO 5 1975, 24.38 m (80.0 ft) NNW of bench mark NO
3 1975, and 22.07 m (72.4 ft) SW of the south corner of a Tiki Bar and
Restuarant. 

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

                                                                                
Station ID: 8723949                         PUBLICATION DATE:  12/12/2003
Name:       FAT DEER KEY                                      
            FL
NOAA Chart: 11449                           Latitude:   24° 44.0' N (  24.73330)
USGS Quad:  MARATHON                        Longitude:  81°  1.0' W ( -81.01670)


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


                         BENCH MARK STAMPING:  NO 5 1975
                         DESIGNATION:          872 3949 TIDAL 5

MONUMENTATION:           Tidal Station disk                    VM#:         6292
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0875
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID:        
LATITUDE:   24° 44.0' N (  24.73330)          LONGITUDE:  81°  1.0' W ( -81.01670)


The bench mark is a disk set flush in the top of a concrete pad for a tower guy
wire, north of the north corner of the restaurant, 41.64 m (136.6 ft) east of
bench mark NO 4 1975, and 11.28 m (37.0 ft) SE of the east corner of the
apartment building.

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

                                                                                
Station ID: 8723949                         PUBLICATION DATE:  12/12/2003
Name:       FAT DEER KEY                                      
            FL
NOAA Chart: 11449                           Latitude:   24° 44.0' N (  24.73330)
USGS Quad:  MARATHON                        Longitude:  81°  1.0' W ( -81.01670)


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


                         BENCH MARK STAMPING:  Y 273 1966
                         DESIGNATION:          Y 273

MONUMENTATION:           Bench Mark disk                       VM#:         6293
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AA0333
SETTING CLASSIFICATION:  Concrete base                         OPUS PID:        
LATITUDE:   24° 43.9' N (  24.73170)          LONGITUDE:  81°  1.2' W ( -81.02000)


The bench mark is a disk set in the top of the east corner of a 1.5 m x 1.8 m (5
ft x 6 ft) concrete base of a radio tower for the Florida Keys Aquaduct
Commission, located 6.1 km (3.8 mi) NE of the Post Office in Marathon, and 1.0
km (0.6 mi) NE of the NE end of a concrete bridge over Key Vaca Cut, 46 m (151
ft) SE of the centerline of the highway, and 3 m (11 ft) SE of the east corner
of a small concrete building.

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

                                                                                
Station ID: 8723949                         PUBLICATION DATE:  12/12/2003
Name:       FAT DEER KEY                                      
            FL
NOAA Chart: 11449                           Latitude:   24° 44.0' N (  24.73330)
USGS Quad:  MARATHON                        Longitude:  81°  1.0' W ( -81.01670)


                            T I D A L   D A T U M S 


Tidal datums at FAT DEER KEY based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           May 1975 - May 1975
     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   =  0.472
     North American Vertical Datum              NAVD88 =  0.466
     MEAN HIGH WATER                            MHW    =  0.414
     MEAN TIDE LEVEL                            MTL    =  0.244
     MEAN SEA LEVEL                             MSL    =  0.221
     MEAN LOW WATER                             MLW    =  0.074
     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                                   0.799    0.385
     NO 2 1975                                   1.841    1.427
     NO 3 1975                                   1.397    0.983
     NO 4 1975                                   1.427    1.013
     NO 5 1975                                   2.194    1.780
     Y 273 1966                                  2.273    1.859


Foot Notes:

Bench mark Y 273 1966 is based on one differential leveling connection and does
not meet the quality control standards of the NOS. Therefore, caution should be
used when deriving elevations for this mark.

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

                                                                                
Station ID: 8723949                         PUBLICATION DATE:  12/12/2003
Name:       FAT DEER KEY                                      
            FL
NOAA Chart: 11449                           Latitude:   24° 44.0' N (  24.73330)
USGS Quad:  MARATHON                        Longitude:  81°  1.0' W ( -81.01670)


                             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 8723949 FAT DEER KEY, FL

Revised: 10/15/2013
NOAA / National Ocean Service
Web site owner: Center for Operational Oceanographic Products and Services