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Bench Mark Sheet for 8723214, Virginia Key, 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  7

                                                                                
Station ID: 8723214                         PUBLICATION DATE:  01/24/2018
Name:       VIRGINIA KEY, BISCAYNE BAY                        
            FL
NOAA Chart: 11465                           Latitude:   25° 43.9' N (  25.73140)
USGS Quad:  KEY BISCAYNE                    Longitude:  80°  9.7' W ( -80.16180)


To reach the tidal bench marks from the intersection of U.S. Route 1 and
Rickenbacker Causeway, proceed  5 km (3 mi) east on Rickenbacker Causeway to the
entrance of the Rosenstiel School of Marine and Atmospheric Science (Univ. of
Miami).  The bench marks are located in the vicinity of the concrete pier and on
the School grounds.  The tide station is located at the outer end of the
concrete pier.


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


                 PRIMARY BENCH MARK STAMPING:  3214 G 1998
                         DESIGNATION:          872 3214 G

MONUMENTATION:           Tidal Station disk                    VM#:        13894
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AH5247
SETTING CLASSIFICATION:  Concrete wing wall                    OPUS PID#: AH5247
LATITUDE:   25° 43.9' N (  25.73239)          LONGITUDE:  80°  9.7' W ( -80.16122)


The bench mark is a disk set flush in the concrete wing wall on the NW side the
Rickenbacker Causeway bridge over Bear Cut, next to the property of the
Rosenstiel School of Marine and Atmospheric Sciences, 17.12 m (56.2 ft) SE of
the corner of the chainlink fence at the NE corner of the school property, 8.85
m (29.0 ft) SW of the SW metal rail of the bridge, 2.85 m (9.4 ft) NNW of a
chainlink fence that runs into the bridge, and 0.35 m (1.2 ft) SE of the NE end
of the wing wall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  2 of  7

                                                                                
Station ID: 8723214                         PUBLICATION DATE:  01/24/2018
Name:       VIRGINIA KEY, BISCAYNE BAY                        
            FL
NOAA Chart: 11465                           Latitude:   25° 43.9' N (  25.73140)
USGS Quad:  KEY BISCAYNE                    Longitude:  80°  9.7' W ( -80.16180)


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


                         BENCH MARK STAMPING:  3214 B 1994
                         DESIGNATION:          872 3214 B

MONUMENTATION:           Tidal Station disk                    VM#:        12600
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AH5251
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   25° 43.9' N (  25.73217)          LONGITUDE:  80°  9.7' W ( -80.16222)


The primary bench mark is a disk located at the shore end of the pier at the
Rosenstiel School of Marine and Atmospheric Science, 38.70 m (127.0 ft) NE of
the SE corner of the Alfred C. Glassell Jr. Lab, 7.71 m (25.3 ft) SE of the west
corner of a 8.99 m x 7.16 m (29.5 ft x 23.5 ft) satellite dish foundation, 7.44
m (24.4 ft) NW of the west corner of a 1.19 m x 1.19 m (3.9 ft x 3.9 ft)
satellite dish foundation, and 2.95 m (9.7 ft) ENE of the centerline of the
concrete pier. The bench mark is 6 cm (0.2 ft) below ground level, crimped to a
stainless steel rod driven 15.8 m (51.8 ft) to refusal, and encased in a 6-inch
PVC pipe with concrete kickblock.



                         BENCH MARK STAMPING:  3214 D 1994
                         DESIGNATION:          872 3214  D

MONUMENTATION:           Tidal Station disk                    VM#:        12602
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  AH5248
SETTING CLASSIFICATION:  Concrete step                         OPUS PID:        
LATITUDE:   25° 43.9' N (  25.73222)          LONGITUDE:  80°  9.8' W ( -80.16331)


The bench mark is a disk set flush in a concrete step of the NW entrance to the
Operations Building, 24.60 m (80.7 ft) NW of the east corner of the Grosvenor
Building, 20.18 m (66.2 ft) west of the NW corner of the Grosvenor Building,
7.92m (26.0 ft) West of steps leading to main entrance of operation (1120)
building, and 3.32m (10.9 ft) SE from the back NW corner of operation (1120)
building.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  3 of  7

                                                                                
Station ID: 8723214                         PUBLICATION DATE:  01/24/2018
Name:       VIRGINIA KEY, BISCAYNE BAY                        
            FL
NOAA Chart: 11465                           Latitude:   25° 43.9' N (  25.73140)
USGS Quad:  KEY BISCAYNE                    Longitude:  80°  9.7' W ( -80.16180)


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


                         BENCH MARK STAMPING:  3214 H 2003
                         DESIGNATION:          872 3214 H

MONUMENTATION:           Tidal Station disk                    VM#:        17158
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete retaining wall               OPUS PID:        
LATITUDE:   25° 44.0' N (  25.73281)          LONGITUDE:  80°  9.7' W ( -80.16178)


The bench mark is a disk set flush in a concrete retaining wall for a handrail
by the sidewalk, on the SE end of the retaining wall, 16.07 m (52.7 ft) ENE of a
chainlink fence on the east side of the school property, 9.02 m (29.6 ft) west
of the west corner of a public bathroom, 8.67 m (28.4 ft) SW of a retaining wall
on the west side of Rickenbacker Causeway, and 0.56 m (1.8 ft) above the
sidewalk.



                         BENCH MARK STAMPING:  3214 J 2004
                         DESIGNATION:          872 3214 J

MONUMENTATION:           Tidal Station disk                    VM#:        17686
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete steps                        OPUS PID:        
LATITUDE:   25° 44.0' N (  25.73311)          LONGITUDE:  80°  9.8' W ( -80.16278)


The bench mark is a disk set flush in the northern most entrance steps to the
Science and Administratation building on the university property, 15.33 m (50.3
ft) west of the NE corner of the lab building (NO 1164), 14.04 m (46.1 ft) SW of
the center of two flag poles, 6.14 m (20.1 ft) south of a yellow fire hydrant,
and 3.50 m (11.5 ft) west of a storm drain.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  4 of  7

                                                                                
Station ID: 8723214                         PUBLICATION DATE:  01/24/2018
Name:       VIRGINIA KEY, BISCAYNE BAY                        
            FL
NOAA Chart: 11465                           Latitude:   25° 43.9' N (  25.73140)
USGS Quad:  KEY BISCAYNE                    Longitude:  80°  9.7' W ( -80.16180)


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


                         BENCH MARK STAMPING:  3214 K 2009
                         DESIGNATION:          872 3214 K

MONUMENTATION:           Bench Mark disk                       VM#:        19220
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Pier                                  OPUS PID#: BBFR39
LATITUDE:   25° 43.9' N (  25.73158)          LONGITUDE:  80°  9.7' W ( -80.16194)


The benchmark is a disk on the pier of the RSMAAS located 120.55 m (395.5 ft) SW
of the SE corner of the Rickenbacher causeway, 70.40 m (231.0 ft) ESE of the SE
corner of the Glassel lab building, 65.70 m (215.6 ft) SE of the main satellite
dish on the school property, 56.13 m (184.2 ft) SSE of the base of the pier,
31.00 m (102 ft) ENE of the end of the SW finger of the pier, 20.59 m (67.6 ft)
of the station house, and 12.31 m (40.4 ft) of the NE finger of the pier.



                         BENCH MARK STAMPING:  3214 M 2009
                         DESIGNATION:          872 3214 M

MONUMENTATION:           Flange-encased Rod                    VM#:        19222
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   25° 44.0' N (  25.73306)          LONGITUDE:  80°  9.8' W ( -80.16394)


The benchmark is a flange-encased rod located in the north parking lot of the
school property in a grassy median, 30.72 m (100.8 ft) north of the north corner
of the cimas building, 15.75 m (51.7 ft) west of the NE corner of the shipping
and receiving building, 10.19 m (33.4 ft) of the NW corner of the shipping and
receiving building, 9.88 m (32.4 ft) west of the east corner of the shipping and
receiving dock, 7.96 west of the west corner of the shipping and receiving dock,
and 0.57 m (1.9 ft) SE of the fence line, and a carsonite witness post.  The
datum point is set 5 cm (0.2 ft) below the ground, being the top of a stainless
steel rod driven to 24.3 m (80 ft) to refusal, and encased in a 5-inch NGS logo
cap.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  5 of  7

                                                                                
Station ID: 8723214                         PUBLICATION DATE:  01/24/2018
Name:       VIRGINIA KEY, BISCAYNE BAY                        
            FL
NOAA Chart: 11465                           Latitude:   25° 43.9' N (  25.73140)
USGS Quad:  KEY BISCAYNE                    Longitude:  80°  9.7' W ( -80.16180)


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


                         BENCH MARK STAMPING:  3214 P 2015
                         DESIGNATION:          872 3214 P

MONUMENTATION:           Tidal Station disk                    VM#:        21473
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete loading dock                 OPUS PID:        
LATITUDE:   25° 44.0' N (  25.73306)          LONGITUDE:  80°  9.8' W ( -80.16389)


The bench mark is a surface disk in the rear of a parking garage on west side of
Rosenstiel School of Marine and Atmospheric Science property located on the
northwest end of the backside of the garage on the loading dock of building
(G48A), northwest side at top of steps leading up to loading dock, 14.55 m (47.7
ft) north of south wall of chemical pump (G51) room, 2.8 m (9.2 ft) west of G48A
receiving door, and 0.58 m (1.9 ft) east edge of the top step.



                         BENCH MARK STAMPING:  3214 R 2015
                         DESIGNATION:          872 3214 R

MONUMENTATION:           Tidal Station disk                    VM#:        21474
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Apron                                 OPUS PID:        
LATITUDE:   25° 44.0' N (  25.73361)          LONGITUDE:  80°  9.8' W ( -80.16306)


The bench mark is a surface disk located in the front of a parking garage on the
west side of Rosenstiel School of Marine And Atmospheric Science property, 7.53
m (24.7 ft) north from third column from left of the front of the parking
garage, 1 m (3.3 ft) west from front edge of where concrete meets asphalt, and
.27 m (0.9 ft) of inside of northwest wall.

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
                                                                   Page  6 of  7

                                                                                
Station ID: 8723214                         PUBLICATION DATE:  01/24/2018
Name:       VIRGINIA KEY, BISCAYNE BAY                        
            FL
NOAA Chart: 11465                           Latitude:   25° 43.9' N (  25.73140)
USGS Quad:  KEY BISCAYNE                    Longitude:  80°  9.7' W ( -80.16180)


                            T I D A L   D A T U M S 


Tidal datums at VIRGINIA KEY, BISCAYNE BAY based on:

     LENGTH OF SERIES:      18 YEARS
     TIME PERIOD:           01/98-12/13, 02/15-01/16, 04/16-03/17
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8724580 KEY WEST


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

     HIGHEST OBSERVED WATER LEVEL (09/10/2017)         =  1.769
     MEAN HIGHER HIGH WATER                     MHHW   =  0.676
     MEAN HIGH WATER                            MHW    =  0.658
     North American Vertical Datum              NAVD88 =  0.614
     MEAN TIDE LEVEL                            MTL    =  0.348
     MEAN SEA LEVEL                             MSL    =  0.339
     MEAN LOW WATER                             MLW    =  0.038
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (03/29/1994)         = -0.394

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     3214 G 1998                                 1.647    0.989
     3214 B 1994                                 1.909    1.251
     3214 D 1994                                 2.087    1.429
     3214 H 2003                                 2.813    2.155
     3214 J 2004                                 2.268    1.610
     3214 K 2009                                 2.040    1.382
     3214 M 2009                                 2.101    1.443
     3214 P 2015                                 3.172    2.514
     3214 R 2015                                 2.182    1.524


Foot Notes:

Bench marks 3214 P 2015 and 3214 R 2015 are based on one differential leveling
connection and do not meet the quality control standards of the NOS. Therefore,
caution should be used when deriving elevations for these marks.

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

                                                                                
Station ID: 8723214                         PUBLICATION DATE:  01/24/2018
Name:       VIRGINIA KEY, BISCAYNE BAY                        
            FL
NOAA Chart: 11465                           Latitude:   25° 43.9' N (  25.73140)
USGS Quad:  KEY BISCAYNE                    Longitude:  80°  9.7' W ( -80.16180)


                             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 8723214 Virginia Key, Biscayne Bay, FL

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