Bench Mark Sheet for 8723423, TURKEY POINT, BISCAYNE BAY 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  8

                                                                                
Station ID: 8723423                         PUBLICATION DATE:  09/15/2004
Name:       TURKEY POINT, BISCAYNE BAY                        
            FL
NOAA Chart: 11462                           Latitude:   25° 26.2' N (  25.43670)
USGS Quad:  ARSENICKER KEYS                 Longitude:  80° 19.8' W ( -80.33000)


To reach the tidal bench marks from the intersection of U.S. Highway 1 and Palm
Drive in Florida City, proceed 13 km (8 mi) east, then 1.9 km (1.2 mi) SE on a
paved road to the Turkey Point Power Plant.  The bench marks are in the vicinity
of the Turkey Point Power Plant boat ramp and fuel pier.  The tide gage and
staff were located  on the southwestern side of the boat ramp.


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


                 PRIMARY BENCH MARK STAMPING:  A 316 1970
                         DESIGNATION:          A 316

MONUMENTATION:           Bench Mark disk                       VM#:         5846
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  AC1173
SETTING CLASSIFICATION:  Concrete wall                         OPUS PID:        
LATITUDE:   25° 26.3' N (  25.43830)          LONGITUDE:  80° 19.7' W ( -80.32830)


The bench  mark is a disk set flush in the top of a concrete wall along the
north side of the cooling canal at the fuel pier, 5.43 m (17.8 ft) south of the
SE fuel pier, 1 m (3 ft) above the fuel pier, 8.23 m (27.0 ft) SE (130 
magnetic) of asphalt drive where sidewalk runs perpendicular to drive, and 11.28
m (37.0 ft) SW (190  magnetic) from the NE corner of fence at the south gate
post on asphalt drive.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  8

                                                                                
Station ID: 8723423                         PUBLICATION DATE:  09/15/2004
Name:       TURKEY POINT, BISCAYNE BAY                        
            FL
NOAA Chart: 11462                           Latitude:   25° 26.2' N (  25.43670)
USGS Quad:  ARSENICKER KEYS                 Longitude:  80° 19.8' W ( -80.33000)


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


                         BENCH MARK STAMPING:  B 316 1970
                         DESIGNATION:          B 316

MONUMENTATION:           Bench Mark disk                       VM#:         5847
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  AC1172
SETTING CLASSIFICATION:  Concrete box                          OPUS PID:        
LATITUDE:   25° 26.2' N (  25.43670)          LONGITUDE:  80° 19.8' W ( -80.33000)


The bench mark is a disk set flush in the NE corner of the top of a 1 m x 2 m (4
ft x 8 ft) concrete box with a metal cover, 39.62 m (130.0 ft) south (170 
magnetic)  from the west steel fuel tank, 10.67 m (35.0 ft) NNE (30  magnetic)
of the north side of a concrete drain culvert that is positioned under asphalt
drive, 6.55 m (21.5 ft) north of the centerline of the driveway, and level with
the driveway.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  8

                                                                                
Station ID: 8723423                         PUBLICATION DATE:  09/15/2004
Name:       TURKEY POINT, BISCAYNE BAY                        
            FL
NOAA Chart: 11462                           Latitude:   25° 26.2' N (  25.43670)
USGS Quad:  ARSENICKER KEYS                 Longitude:  80° 19.8' W ( -80.33000)


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


                         BENCH MARK STAMPING:  LM 12 316
                         DESIGNATION:          LM 12 316 FLPCO

MONUMENTATION:           Cap-and-Bolt                          VM#:         5848
AGENCY:                  Florida Power & Light Company
                         (FLPCO)                                   IDB PID#:  AC3303
SETTING CLASSIFICATION:  Galvanized steel pipe                 OPUS PID:        
LATITUDE:   25° 26.0' N (  25.43330)          LONGITUDE:  80° 20.2' W ( -80.33670)


The bench mark is a stainless steel bolt and washer located 0.6 km (0.5 mi) SW
of the power plant, 8.23 m (27 ft) north of the centerline of the paved road,
2.59 m (8.5 ft) east of a foot bridge, and 2.19 m (7.2 ft) south of the intake
canal.  The bench mark is cemented into a 0.03 m (0.1 ft) diameter galvanized
steel pipe driven to a depth of 6.1 m (20 ft), and encased in a pipe that
projects 0.21 m (0.7 ft) above ground level.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  8

                                                                                
Station ID: 8723423                         PUBLICATION DATE:  09/15/2004
Name:       TURKEY POINT, BISCAYNE BAY                        
            FL
NOAA Chart: 11462                           Latitude:   25° 26.2' N (  25.43670)
USGS Quad:  ARSENICKER KEYS                 Longitude:  80° 19.8' W ( -80.33000)


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


                         BENCH MARK STAMPING:  TURKEY POINT NO 2 NO 2
                         DESIGNATION:          TURKEY POINT 2 RM 2

MONUMENTATION:           Reference Mark disk                   VM#:         5849
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AC1176
SETTING CLASSIFICATION:  Metal pipe imbedded in ground         OPUS PID:        
LATITUDE:   25° 26.3' N (  25.43830)          LONGITUDE:  80° 19.1' W ( -80.31830)


The bench mark is a disk set on a metal pipe embeded in ground, located about
1.3 km (0.8 mi) east of the Turkey Point Nuclear Power Plant on a peninsula
known locally as Turkey Point, near the center of a picnic area, 55 m (180 ft)
west of the shoreline at the east end of the point, 2 m (5 ft) west of the west
edge of a stone wall, and 0.46 m (1.5 ft) below ground level in a depression. 
Note: Access to the bench mark is through the top of a 0.46 m (1.5 ft) diameter
barrel.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  8

                                                                                
Station ID: 8723423                         PUBLICATION DATE:  09/15/2004
Name:       TURKEY POINT, BISCAYNE BAY                        
            FL
NOAA Chart: 11462                           Latitude:   25° 26.2' N (  25.43670)
USGS Quad:  ARSENICKER KEYS                 Longitude:  80° 19.8' W ( -80.33000)


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


                         BENCH MARK STAMPING:  TURKEY POINT 3 1972
                         DESIGNATION:          TURKEY PT 3

MONUMENTATION:           Survey disk                           VM#:         5850
AGENCY:                  National Geodetic Survey (NGS)        IDB PID#:  AE9200
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   25° 26.3' N (  25.43830)          LONGITUDE:  80° 19.1' W ( -80.31830)


The bench mark is a disk set on top of a round concrete post located 0.3 km (0.2
mi) NW of a point known locally as Turkey Point, 46 m (150 ft) NNW of the
shoreline on the south side, 27 m (88 ft) SSE of the centerline of a gravel
road, and 10 m (32 ft) NNW of the centerline of the road on the south side.



                         BENCH MARK STAMPING:  3423 A 1993
                         DESIGNATION:          872 3423 A

MONUMENTATION:           Tidal Station disk                    VM#:        12527
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete bulkhead                     OPUS PID:        
LATITUDE:   25° 26.2' N (  25.43670)          LONGITUDE:  80° 19.7' W ( -80.32830)


The bench mark is a disk set flush in the SW corner of the top of a  concrete
bulkhead, attached to a 1.83 m x 2.44 m (6.0 ft x 8.0 ft) covered concrete pad
(fish cleaning stand),  8.23 m (27.0 ft) west of the southwestern corner of the
boat ramp, 8 m (26 ft) south of a 0.3 m (1 ft) square concrete light pole with
two lights mounted at the top, 0.21 m (0.7 ft) north of the south edge of
bulkhead, and 0.21 m (0.8 ft) east of the west end of bulkhead.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  8

                                                                                
Station ID: 8723423                         PUBLICATION DATE:  09/15/2004
Name:       TURKEY POINT, BISCAYNE BAY                        
            FL
NOAA Chart: 11462                           Latitude:   25° 26.2' N (  25.43670)
USGS Quad:  ARSENICKER KEYS                 Longitude:  80° 19.8' W ( -80.33000)


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


                         BENCH MARK STAMPING:  3423 B 1993
                         DESIGNATION:          872 3423 B

MONUMENTATION:           Tidal Station disk                    VM#:        12528
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete pad                          OPUS PID:        
LATITUDE:   25° 26.2' N (  25.43670)          LONGITUDE:  80° 19.7' W ( -80.32830)


The bench mark is a disk set flush in the top of a 2.13 m x 2.13 m (7.0 ft x 7.0
ft) concrete pad, 30.48 m (100.0 ft) north of the SW end of the bulkhead, 7.47 m
(24.5 ft) west of the NW corner of the boat ramp, and 0.43 m (1.4 ft) east of a
steel I-beam covered with plastic piping located in the concrete pad. 



                         BENCH MARK STAMPING:  3423 C 1993
                         DESIGNATION:          872 3423 C 1993

MONUMENTATION:           Tidal Station disk                    VM#:        12529
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete bulkhead                     OPUS PID:        
LATITUDE:   25° 26.2' N (  25.43670)          LONGITUDE:  80° 19.7' W ( -80.32830)


The bench mark is a disk set flush in the top of a concrete bulkhead on the SE
side of the boat ramp, 4.57 m (15.0 ft) west of the SE end of the bulkhead, 3.81
m (12.5 ft) east of the SW corner of the bulkhead to the boat ramp, and 0.15 m
(0.5 ft) north of the south edge of the bulkhead. 

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  7 of  8

                                                                                
Station ID: 8723423                         PUBLICATION DATE:  09/15/2004
Name:       TURKEY POINT, BISCAYNE BAY                        
            FL
NOAA Chart: 11462                           Latitude:   25° 26.2' N (  25.43670)
USGS Quad:  ARSENICKER KEYS                 Longitude:  80° 19.8' W ( -80.33000)


                            T I D A L   D A T U M S 


Tidal datums at TURKEY POINT, BISCAYNE BAY based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           May 1970 - April 1971
     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:

     HIGHEST OBSERVED WATER LEVEL (10/18/1970)         =  0.935
     MEAN HIGHER HIGH WATER                     MHHW   =  0.543
     North American Vertical Datum              NAVD88 =  0.536
     MEAN HIGH WATER                            MHW    =  0.525
     MEAN TIDE LEVEL                            MTL    =  0.279
     MEAN SEA LEVEL                             MSL    =  0.271
     MEAN LOW WATER                             MLW    =  0.033
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (04/24/1971)         = -0.340

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     A 316 1970                                  2.617    2.092
     B 316 1970                                  2.154    1.629
     LM 12 316                                   2.369    1.844
     TURKEY POINT NO 2 NO 2                      0.560    0.035
     TURKEY POINT 3 1972                         1.078    0.553
     3423 A 1993                                 1.187    0.662
     3423 B 1993                                 1.174    0.649
     3423 C 1993                                 1.183    0.658


                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  8 of  8

                                                                                
Station ID: 8723423                         PUBLICATION DATE:  09/15/2004
Name:       TURKEY POINT, BISCAYNE BAY                        
            FL
NOAA Chart: 11462                           Latitude:   25° 26.2' N (  25.43670)
USGS Quad:  ARSENICKER KEYS                 Longitude:  80° 19.8' W ( -80.33000)


                             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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