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Bench Mark Sheet for 8724276, SUMMERLAND KEY, WEST 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8724276                         PUBLICATION DATE:  05/28/2004
Name:       SUMMERLAND KEY, WEST SIDE                         
            FL
NOAA Chart: 11445                           Latitude:   24° 39.0' N (  24.65000)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 26.8' W ( -81.44670)


To reach the tidal bench marks from the Summerland Key post office, proceed west
on U.S. Highway 1 for 0.40 km (0.25 mi), then turn left and proceed south on
Caribbean Drive for 0.08 km (0.05 mi), then turn left and proceed SE on East
Caribbean Drive for 1.3 km (0.8 mi), then turn right and proceed SW on Isles
Boulevard for 0.3 km (0.2 mi) to its end, then turn left and proceed SSE on
Flagship Drive for 0.2 km (0.1 mi) to 1036 Flagship Drive.  The bench marks are
located in the concrete sea wall.  The tide gage and staff were located behind
the residence at 1036 Flagship Drive, on the sea wall.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1975
                         DESIGNATION:          872 4276 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:         6897
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0964
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 39.0' N (  24.65000)          LONGITUDE:  81° 26.8' W ( -81.44670)


The primary bench mark is a disk set flush in the concrete sea wall at the NE
corner of the boat slip behind the residence at 1036 Flagship Drive, 8.47 m
(27.8 ft) NW of the south edge of the property, and 8.23 m (27.0 ft) west of the
west side of the house.

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

                                                                                
Station ID: 8724276                         PUBLICATION DATE:  05/28/2004
Name:       SUMMERLAND KEY, WEST SIDE                         
            FL
NOAA Chart: 11445                           Latitude:   24° 39.0' N (  24.65000)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 26.8' W ( -81.44670)


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


                         BENCH MARK STAMPING:  NO 2 1975
                         DESIGNATION:          872 4276 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:         6898
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0965
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 39.0' N (  24.65000)          LONGITUDE:  81° 26.8' W ( -81.44670)


The bench mark is a disk set flush in the concrete sea wall near the NW corner
of the residence, 65 m (212 ft) south of the SW corner of a small boat basin,
and 17 m (55 ft) west of bench mark NO 1 1975.



                         BENCH MARK STAMPING:  NO 3 1975
                         DESIGNATION:          872 4276 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:         6899
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0963
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 39.0' N (  24.65000)          LONGITUDE:  81° 26.8' W ( -81.44670)


The bench mark is a disk set flush in the SE concrete sea wall of the boat
basin, 51 m (166 ft) SW of the centerline of Flagship Drive, 39 m (129 ft) SW of
the NE end of the sea wall, and 0.3 m (1 ft) below road level.

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

                                                                                
Station ID: 8724276                         PUBLICATION DATE:  05/28/2004
Name:       SUMMERLAND KEY, WEST SIDE                         
            FL
NOAA Chart: 11445                           Latitude:   24° 39.0' N (  24.65000)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 26.8' W ( -81.44670)


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


                         BENCH MARK STAMPING:  NO 4 1975
                         DESIGNATION:          872 4276 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:         6900
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0962
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 39.0' N (  24.65000)          LONGITUDE:  81° 26.8' W ( -81.44670)


The bench mark is a disk set flush in the concrete sea wall at the north corner
of the boat basin, 29.72 m (97.5 ft) NE of the SW end of the northernmost sea
wall, 19 m (61 ft) NW of the SE end of the easternmost sea wall, 12 m (38 ft) SW
of the centerline of Flagship Drive, and 0.3 m (1 ft) below road level.



                         BENCH MARK STAMPING:  NO 5 1975
                         DESIGNATION:          872 4276 TIDAL 5

MONUMENTATION:           Tidal Station disk                    VM#:         6901
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AA0961
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   24° 39.0' N (  24.65000)          LONGITUDE:  81° 26.8' W ( -81.44670)


The bench mark is a disk set flush in the northernmost sea wall of the boat
basin, 41.30 m (135.5 ft) SW of the centerline of Flagship Drive, 29.72 m (97.5
ft) SW of the NE end of the sea wall, and 0.3 m (1 ft) below the road.

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

                                                                                
Station ID: 8724276                         PUBLICATION DATE:  05/28/2004
Name:       SUMMERLAND KEY, WEST SIDE                         
            FL
NOAA Chart: 11445                           Latitude:   24° 39.0' N (  24.65000)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 26.8' W ( -81.44670)


                            T I D A L   D A T U M S 


Tidal datums at SUMMERLAND KEY, WEST SIDE based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           April 1975 - April 1975
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8724138 BAHIA HONDA KEY


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.464
     North American Vertical Datum              NAVD88 =  0.448
     MEAN HIGH WATER                            MHW    =  0.374
     MEAN TIDE LEVEL                            MTL    =  0.207
     MEAN SEA LEVEL                             MSL    =  0.201
     MEAN LOW WATER                             MLW    =  0.040
     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                                   1.132    0.758
     NO 2 1975                                   1.078    0.704
     NO 3 1975                                   0.583    0.209
     NO 4 1975                                   1.236    0.862
     NO 5 1975                                   1.232    0.858


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

                                                                                
Station ID: 8724276                         PUBLICATION DATE:  05/28/2004
Name:       SUMMERLAND KEY, WEST SIDE                         
            FL
NOAA Chart: 11445                           Latitude:   24° 39.0' N (  24.65000)
USGS Quad:  SUMMERLAND KEY                  Longitude:  81° 26.8' W ( -81.44670)


                             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 8724276 SUMMERLAND KEY, WEST SIDE, FL

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