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Bench Mark Sheet for 8724948, EVERGLADES CITY 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8724948                         PUBLICATION DATE:  09/22/2003
Name:       EVERGLADES CITY                                   
            FL
NOAA Chart: 11429                           Latitude:   25° 51.5' N (  25.85830)
USGS Quad:  EVERGLADES CITY                 Longitude:  81° 23.2' W ( -81.38670)


To reach the tidal bench marks from Everglades City, proceed west along Broadway
from City Hall to the Rod and Gun Club. The bench marks are located in the
vicinity of the club and along Broadway.  The gage and staff were located at the
Rod and Gun Club piling bulkhead on the east side of the Barron River.


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


                 PRIMARY BENCH MARK STAMPING:  4948 A 1978

MONUMENTATION:           Tidal Station disk                    VM#:         9710
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AC3268
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   25° 51.5' N (  25.85830)          LONGITUDE:  81° 23.2' W ( -81.38670)


The primary bench mark is a disk set in the concrete sea wall at the NE corner
of the Rod and Gun Club property, 45 m (147 ft) NE of the NE corner of the first
house east of the lodge, 0.61 m (2.0 ft) west of the east edge of the seawall,
and 0.55 m (1.8 ft) south of the north edge of the seawall.



                         BENCH MARK STAMPING:  4948 B 1978

MONUMENTATION:           Tidal Station disk                    VM#:         9711
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AC3267
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   25° 51.5' N (  25.85830)          LONGITUDE:  81° 23.2' W ( -81.38670)


The bench mark is a disk set in the west concrete foundation for a guy wire of
the micro tower in the median area of Broadway, 23 m (74 ft) SE of the SE corner
of a tennis court, 9 m (30 ft) south of the centerline of the westbound lane of
Broadway, 6 m (21 ft) north of the centerline of the eastbound lane of Broadway,
and 0.55 m (1.8 ft) NW of the NW corner of the concrete foundation.

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

                                                                                
Station ID: 8724948                         PUBLICATION DATE:  09/22/2003
Name:       EVERGLADES CITY                                   
            FL
NOAA Chart: 11429                           Latitude:   25° 51.5' N (  25.85830)
USGS Quad:  EVERGLADES CITY                 Longitude:  81° 23.2' W ( -81.38670)


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


                         BENCH MARK STAMPING:  4948 C 1978

MONUMENTATION:           Tidal Station disk                    VM#:         9712
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AC3269
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   25° 51.4' N (  25.85670)          LONGITUDE:  81° 23.1' W ( -81.38500)


The bench mark is a disk set in the median area of Broadway east of the micro
tower, 36 m (118 ft) SE of the SE corner of City Hall, 25 m (82 ft) SE of Bench
Mark V 249 1965, 8 m (27 ft) north of the eastbound lane of Broadway, 6 m (21
ft) south of the centerline of the westbound lane of Broadway, and 0.37 m (1.2
ft) north of the concrete foundation for a guy wire.



                         BENCH MARK STAMPING:  V 249 1965

MONUMENTATION:           Bench Mark disk                       VM#:         9713
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AC0625
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   25° 51.4' N (  25.85670)          LONGITUDE:  81° 23.1' W ( -81.38500)


The bench mark is a disk set in the lawn in front of City Hall, 25 m (82 ft) NW
of bench mark 4948 C 1978, 15 m (49 ft) south of the SE corner of City Hall, 14
m (47 ft) SE of a flagpole, 5 m (16 ft) north of the north edge of the sidewalk,
and 0.18 m (0.6 ft) east of a monument in front of City Hall.  The bench mark is
set flush with the ground, crimped to the top of a copper-clad steel rod driven
10.5 m (34.5 ft) to refusal, and encased in a 4-inch iron pipe.

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

                                                                                
Station ID: 8724948                         PUBLICATION DATE:  09/22/2003
Name:       EVERGLADES CITY                                   
            FL
NOAA Chart: 11429                           Latitude:   25° 51.5' N (  25.85830)
USGS Quad:  EVERGLADES CITY                 Longitude:  81° 23.2' W ( -81.38670)


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


                         BENCH MARK STAMPING:  5 1929

MONUMENTATION:           Tidal Station disk                    VM#:         9714
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AC0633
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID#: AC0633
LATITUDE:   25° 51.4' N (  25.85670)          LONGITUDE:  81° 23.3' W ( -81.38830)


The bench mark is a disk set in the top of a concrete monument, near the
junction of Riverside Drive and Broadway, in the median of Broadway, 10 m (32
ft) south of the center line of the westbound lane of Broadway, 8 m (25 ft) east
of the extended centerline of Riverside Drive, 47 m (153 ft) NE of and across
Riverside Drive from bench mark E H 7 1962 JACKSONVILLE FLA, and 0.15 m (0.5 ft)
above ground level.



                         BENCH MARK STAMPING:  3 1928

MONUMENTATION:           Tidal Station disk                    VM#:        17100
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AC0631
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   25° 51.5' N (  25.85830)          LONGITUDE:  81° 23.2' W ( -81.38670)


The bench mark is a disk set in the top of a 1 m x 1 m (2 ft x 2 ft) square
concrete monument, 14.17 m (46.5 ft) NE of the NE corner of he Rod and Gun Club
Lodge, 3.20 m (10.5 ft) NW of a piped well, 6.83 m (22.4 ft) SE of the SW corner
of a cottage, 68.88 m (226.0 ft) west of the centerline of Shorter Avenue, 7.0 m
(23.0 ft) north of the extended centerline of Hibiscus Sreet, and 0.40 m (1.3
ft) above ground level.

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

                                                                                
Station ID: 8724948                         PUBLICATION DATE:  09/22/2003
Name:       EVERGLADES CITY                                   
            FL
NOAA Chart: 11429                           Latitude:   25° 51.5' N (  25.85830)
USGS Quad:  EVERGLADES CITY                 Longitude:  81° 23.2' W ( -81.38670)


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


                         BENCH MARK STAMPING:  E H 7 1962 JACKSONVILLE FLA

MONUMENTATION:           Bench Mark disk                       VM#:        17101
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AC0634
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   25° 51.4' N (  25.85670)          LONGITUDE:  81° 23.3' W ( -81.38830)


The bench mark is a disk set in the top of a concrete monument, 46 m (150 ft)
south of the extended center line of Broadway, 8.08 m (26.5 ft) west of the
center line of Riverside Drive, 2 m (8 ft) east of the bank of the Barron River,
43.90 m (144 ft) NW of the center of the junction of Riverside Drive and Ixora
Street, and at ground level.

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

                                                                                
Station ID: 8724948                         PUBLICATION DATE:  09/22/2003
Name:       EVERGLADES CITY                                   
            FL
NOAA Chart: 11429                           Latitude:   25° 51.5' N (  25.85830)
USGS Quad:  EVERGLADES CITY                 Longitude:  81° 23.2' W ( -81.38670)


                            T I D A L   D A T U M S 


Tidal datums at EVERGLADES CITY based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           February 1978 - January 1979
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8724919 CHOKOLOSKEE


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

     HIGHEST OBSERVED WATER LEVEL (09/04/1979)         =  1.173
     MEAN HIGHER HIGH WATER                     MHHW   =  0.864
     MEAN HIGH WATER                            MHW    =  0.791
     North American Vertical Datum              NAVD88 =  0.632
     MEAN TIDE LEVEL                            MTL    =  0.447
     MEAN SEA LEVEL                             MSL    =  0.427
     MEAN LOW WATER                             MLW    =  0.102
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (01/03/1979)         = -0.379

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     4948 A 1978                                 1.505    0.714
     4948 B 1978                                 1.221    0.430
     4948 C 1978                                 1.242    0.451
     V 249 1965                                  1.053    0.262
     5 1929                                      1.707    0.916
     3 1928                                      1.726    0.935
     E H 7 1962 JACKSONVILLE FLA                 1.127    0.336


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

                                                                                
Station ID: 8724948                         PUBLICATION DATE:  09/22/2003
Name:       EVERGLADES CITY                                   
            FL
NOAA Chart: 11429                           Latitude:   25° 51.5' N (  25.85830)
USGS Quad:  EVERGLADES CITY                 Longitude:  81° 23.2' W ( -81.38670)


                             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 8724948 EVERGLADES CITY, FL

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