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Bench Mark Sheet for 8722977, WEST LAKE, 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  5

                                                                                
Station ID: 8722977                         PUBLICATION DATE:  04/29/2004
Name:       WEST LAKE, NORTH END                              
            FL
NOAA Chart: 11466                           Latitude:   26°  2.6' N (  26.04330)
USGS Quad:  FORT LAUDERDALE SOUTH           Longitude:  80°  7.6' W ( -80.12670)


To reach the tidal bench marks from the State Road 822 (Sheridan Street) bridge
over West Lake, proceed by boat north on West Lake for 1.2 km (0.75 mi) to the
entrance of a canal near an abandoned wood pier and an old concrete foundation. 
The bench marks are on the west bank of the lake north of the canal and on the
old concrete foundation.  The tide gage and staff were on the north end of the
old concrete foundation.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1973
                         DESIGNATION:          872 2977 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:         5727
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   26°  2.6' N (  26.04330)          LONGITUDE:  80°  7.6' W ( -80.12670)


The primary bench mark is a disk set flush in the south end of the old concrete
foundation located at the mouth of the canal, 4.27 m (14.0 ft) south of the
north edge of the foundation, and 1.22 m (4.0 ft) north of the south edge of the
foundation.

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

                                                                                
Station ID: 8722977                         PUBLICATION DATE:  04/29/2004
Name:       WEST LAKE, NORTH END                              
            FL
NOAA Chart: 11466                           Latitude:   26°  2.6' N (  26.04330)
USGS Quad:  FORT LAUDERDALE SOUTH           Longitude:  80°  7.6' W ( -80.12670)


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


                         BENCH MARK STAMPING:  NO 2 1973
                         DESIGNATION:          872 2977 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:         5728
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   26°  2.6' N (  26.04330)          LONGITUDE:  80°  7.6' W ( -80.12670)


The bench mark is a disk set on the west bank of West Lake north of the canal,
16 m (51 ft) west of the west bank of the lake, 12 m (39 ft) north of the north
bank of the canal, and 1 m (2 ft) south of a witness post with sign.  The bench
mark is crimped to the top of a copper-clad steel rod driven 2.4 m (8 ft) to
refusal.



                         BENCH MARK STAMPING:  NO 3 1973
                         DESIGNATION:          872 2977 TIDAL 3

MONUMENTATION:           Tidal Station disk                    VM#:         5729
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   26°  2.6' N (  26.04330)          LONGITUDE:  80°  7.6' W ( -80.12670)


The bench mark is a disk set on the west bank of West Lake north of the canal,
34 m (110 ft) NE of bench mark NO 2 1973, 8 m (25 ft) north of the approximate
water line, 5 m (15 ft) west of the west bank of the lake, and 1 m (3 ft) SE of
a witness post with sign.  The bench mark is crimped to the top of a copper-clad
steel rod driven 2.4 m (8 ft) to refusal.

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

                                                                                
Station ID: 8722977                         PUBLICATION DATE:  04/29/2004
Name:       WEST LAKE, NORTH END                              
            FL
NOAA Chart: 11466                           Latitude:   26°  2.6' N (  26.04330)
USGS Quad:  FORT LAUDERDALE SOUTH           Longitude:  80°  7.6' W ( -80.12670)


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


                         BENCH MARK STAMPING:  NO 4 1973
                         DESIGNATION:          872 2977 TIDAL 4

MONUMENTATION:           Tidal Station disk                    VM#:         5730
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   26°  2.6' N (  26.04330)          LONGITUDE:  80°  7.6' W ( -80.12670)


The bench mark is a disk set on the west bank of West Lake north of the canal,
28 m (93 ft) north of bench mark NO 3 1973, 5 m (15 ft) west of the west bank of
the lake, and 0.76 m (2.5 ft) SW of a witness post with sign.  The bench mark is
crimped to the top of a copper-clad steel rod driven 2.4 m (8 ft) to refusal.



                         BENCH MARK STAMPING:  NO 5 1973
                         DESIGNATION:          872 2977 TIDAL 5

MONUMENTATION:           Tidal Station disk                    VM#:         5731
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:        
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   26°  2.6' N (  26.04330)          LONGITUDE:  80°  7.6' W ( -80.12670)


The bench mark is a disk set on the west bank of West Lake north of the canal,
46 m (150 ft) north of bench mark NO 2 1973, 30 m (100 ft) NW of bench mark NO 3
1973, 27 m (90 ft) WSW of bench mark NO 4 1973, and 1 m (3 ft) NE of a witness
post with sign.  The bench mark is crimped to the top of a copper-clad steel rod
driven 2.4 m (8 ft) to refusal.

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

                                                                                
Station ID: 8722977                         PUBLICATION DATE:  04/29/2004
Name:       WEST LAKE, NORTH END                              
            FL
NOAA Chart: 11466                           Latitude:   26°  2.6' N (  26.04330)
USGS Quad:  FORT LAUDERDALE SOUTH           Longitude:  80°  7.6' W ( -80.12670)


                            T I D A L   D A T U M S 


Tidal datums at WEST LAKE, NORTH END based on:

     LENGTH OF SERIES:      1 MONTH
     TIME PERIOD:           August 1973 - August 1973
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8723170 MIAMI BEACH (CITY PIER)


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.646
     MEAN HIGH WATER                            MHW    =  0.624
     MEAN SEA LEVEL                             MSL    =  0.338
     MEAN TIDE LEVEL                            MTL    =  0.334
     MEAN LOW WATER                             MLW    =  0.044
     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 1973                                   1.290    0.666
     NO 2 1973                                   0.751    0.127
     NO 3 1973                                   0.786    0.162
     NO 4 1973                                   0.892    0.268
     NO 5 1973                                   0.802    0.178


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

                                                                                
Station ID: 8722977                         PUBLICATION DATE:  04/29/2004
Name:       WEST LAKE, NORTH END                              
            FL
NOAA Chart: 11466                           Latitude:   26°  2.6' N (  26.04330)
USGS Quad:  FORT LAUDERDALE SOUTH           Longitude:  80°  7.6' W ( -80.12670)


                             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 8722977 WEST LAKE, NORTH END, FL

Revised: 08/08/2018
NOAA / National Ocean Service
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