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Bench Mark Sheet for 8724542, SIGSBEE PARK, GARRISON BIGHT CHANNEL 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8724542                         PUBLICATION DATE:  02/05/2004
Name:       SIGSBEE PARK, GARRISON BIGHT CHANNEL              
            FL
NOAA Chart: 11441                           Latitude:   24° 35.1' N (  24.58500)
USGS Quad:  KEY WEST                        Longitude:  81° 46.5' W ( -81.77500)


To reach the tidal bench marks from the intersection of U.S. Highway 1 and
Sigsbee Road in Key West, proceed north on Sigsbee Road for 1.9 km (1.2 mi) to
Arthur Sawyer Road East, then turn left and proceed NW on Arthur Sawyer Road
East for 0.08 km (0.05 mi) to a road leading to the Navy Special Services
Marina, then follow the road to the marina.  The bench marks are located within
the marina compound.  The tide gage and staff were located on the SW shore of
Sigsbee Park.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1974
                         DESIGNATION:          872 4542 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:        10980
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA1007
SETTING CLASSIFICATION:  Concrete apron                        OPUS PID:        
LATITUDE:   24° 35.1' N (  24.58500)          LONGITUDE:  81° 46.5' W ( -81.77500)


The primary bench mark is a disk set flush in a concrete apron on the SW corner
of a boat repair shop and sailboat house, 46 m (150 ft) NW of bench mark NO 3
1974, and 4 m (12 ft) SE of the NW shoreline of Sigsbee Park.



                         BENCH MARK STAMPING:  NO 2 1974
                         DESIGNATION:          872 4542 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:        10981
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA1008
SETTING CLASSIFICATION:  Concrete boat ramp                    OPUS PID:        
LATITUDE:   24° 35.1' N (  24.58500)          LONGITUDE:  81° 46.5' W ( -81.77500)


The bench mark is a disk set flush in the north corner of the boat ramp at the
boat repair shop and sailboat house, 22 m (73 ft) NE of bench mark NO 1 1974.

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

                                                                                
Station ID: 8724542                         PUBLICATION DATE:  02/05/2004
Name:       SIGSBEE PARK, GARRISON BIGHT CHANNEL              
            FL
NOAA Chart: 11441                           Latitude:   24° 35.1' N (  24.58500)
USGS Quad:  KEY WEST                        Longitude:  81° 46.5' W ( -81.77500)


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


                         BENCH MARK STAMPING:  NO 3 1974
                         DESIGNATION:          872 4542 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:        10982
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA1009
SETTING CLASSIFICATION:  Concrete apron                        OPUS PID:        
LATITUDE:   24° 35.1' N (  24.58500)          LONGITUDE:  81° 46.5' W ( -81.77500)


The bench mark is a disk set flush in a concrete apron for a small restroom
building, 49 m (162 ft) SE of the NW shoreline, 7 m (24 ft) NW of the south
corner of the building.



                         BENCH MARK STAMPING:  NO 4 1974
                         DESIGNATION:          872 4542 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:        10983
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA1010
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 35.1' N (  24.58500)          LONGITUDE:  81° 46.5' W ( -81.77500)


The bench mark is a disk set in the sea wall for the fuel pier, 52.88 m (173.5
ft) east of bench mark NO 3 1974, 25.15 m (82.5 ft) SE of the west edge of the
fuel pier, and 3.05 m (10.0 ft) SW of the north edge of the fuel pier.  NOTE:
Mark not found in 2003 by US Power Squadron.

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

                                                                                
Station ID: 8724542                         PUBLICATION DATE:  02/05/2004
Name:       SIGSBEE PARK, GARRISON BIGHT CHANNEL              
            FL
NOAA Chart: 11441                           Latitude:   24° 35.1' N (  24.58500)
USGS Quad:  KEY WEST                        Longitude:  81° 46.5' W ( -81.77500)


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


                         BENCH MARK STAMPING:  NO 5 1974
                         DESIGNATION:          872 4542 TIDAL 5

MONUMENTATION:           Tidal Station disk                    VM#:        10984
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA1011
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 35.1' N (  24.58500)          LONGITUDE:  81° 46.5' W ( -81.77500)


The bench mark is a disk set flush in the concrete sea wall at the NE corner of
the marina, 27 m (89 ft) east of bench mark NO 4 1974, 19.05 m (62.5 ft) NW of
the SE corner of the marina sea wall, and 0.64 m (2.1 ft) SE of the north corner
of a curb in front of the marina office.

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

                                                                                
Station ID: 8724542                         PUBLICATION DATE:  02/05/2004
Name:       SIGSBEE PARK, GARRISON BIGHT CHANNEL              
            FL
NOAA Chart: 11441                           Latitude:   24° 35.1' N (  24.58500)
USGS Quad:  KEY WEST                        Longitude:  81° 46.5' W ( -81.77500)


                            T I D A L   D A T U M S 


Tidal datums at SIGSBEE PARK, GARRISON BIGHT CHANNEL based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           September 1974 - September 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   =  0.454
     North American Vertical Datum              NAVD88 =  0.440
     MEAN HIGH WATER                            MHW    =  0.371
     MEAN SEA LEVEL                             MSL    =  0.221
     MEAN TIDE LEVEL                            MTL    =  0.217
     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

     NO 1 1974                                   1.863    1.492
     NO 2 1974                                   1.304    0.933
     NO 3 1974                                   2.204    1.833
     NO 4 1974                                   1.513    1.142
     NO 5 1974                                   1.358    0.987


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

                                                                                
Station ID: 8724542                         PUBLICATION DATE:  02/05/2004
Name:       SIGSBEE PARK, GARRISON BIGHT CHANNEL              
            FL
NOAA Chart: 11441                           Latitude:   24° 35.1' N (  24.58500)
USGS Quad:  KEY WEST                        Longitude:  81° 46.5' W ( -81.77500)


                             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 8724542 SIGSBEE PARK, GARRISON BIGHT CHANNEL, FL

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