Superseded Bench Mark Sheet for 8723165, MIAMI, BISCAYNE BAY FL

Present Epoch

Printable version

                          U.S. DEPARTMENT OF COMMERCE
                National Oceanic and Atmospheric Administration
                            National Ocean Service
Datums Page                                                        Page  1 of  5

                                                   PUBLICATION DATE:  12/22/1986
Station ID: 8723165                                SUPERCEDED DATE:   04/21/2003
Name:       MIAMI, BISCAYNE BAY                               
            FLORIDA
NOAA Chart: 11468                                  Latitude:         25° 46.7' N
USGS Quad:  MIAMI                                  Longitude:        80° 11.1' W


To reach the tidal bench marks from the intersection of Biscayne Boulevard and
Port Boulevard in Miami, proceed south on Biscayne Boulevard one block to the
entrance of Miamarina on the left.  The bench marks are located in the vicinity
of the marina and the west end of the Port Avenue bridge to the Port of Miami on
Dodge Island.  The tide gage and staff are located at the NW end of the
northernmost pier of the marina.


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


                 PRIMARY BENCH MARK STAMPING:  3165 A 1985

MONUMENTATION:           Survey Disk                               VM#:     5770
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Wall


The bench mark is near the SE end of the northernmost pier of Miamarina, set
flush in the center of a 3 foot (1 m) wide concrete wall around the parking lot,
475 feet (145 m) NNE of the inside corner of the seawall at the north side of
the marina restaurant, 140 feet (43 m) west of the east face of the concrete
wall on the east side of Miamarina (on the Intracoastal Waterway), 97 feet (30
m) north along the top of the concrete wall from the north end of the Dockmaster
building, 77 feet (23 m) south of the NE corner of the concrete marina dock, 3
feet (1 m) above dock level, and 0.8 foot (0.2 m) above the level of the parking
lot.



                         BENCH MARK STAMPING:  MH 16 1962

MONUMENTATION:           Survey Disk                               VM#:     5767
AGENCY:                                                            PID#:  AC2177
SETTING CLASSIFICATION:  Concrete Bulkhead


The bench mark is near the west end of the Port Boulevard bridge leading to the
Port of Miami, set flush in the top of a concrete bulkhead near its SE corner on
the north side of Miamarina, 33 feet (10 m) south of the south edge of the
bridge, 6 feet (2 m) west of the east end of the bulkhead, and 2.1 feet (0.6 m)
north of the south face of the bulkhead.

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

                                                   PUBLICATION DATE:  12/22/1986
Station ID: 8723165                                SUPERCEDED DATE:   04/21/2003
Name:       MIAMI, BISCAYNE BAY                               
            FLORIDA
NOAA Chart: 11468                                  Latitude:         25° 46.7' N
USGS Quad:  MIAMI                                  Longitude:        80° 11.1' W


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


                         BENCH MARK STAMPING:  MH 16 RM 1 1962

MONUMENTATION:           Survey Disk                               VM#:     5768
AGENCY:                                                            PID#:  AC2178
SETTING CLASSIFICATION:  Concrete Bulkhead


The bench mark is set flush in the top of a concrete bulkhead on the north side
of Miamarina, 57 feet (17 m) west of the east end of the bulkhead, 51 feet (16
m) west of Bench Mark MH 16 1962, 32 feet (10 m) south of the SW corner of the
Port Boulevard bridge, and 2.1 feet (0.6 m) north of the south face of the
bulkhead.



                         BENCH MARK STAMPING:  MH 16 RM 2 1962

MONUMENTATION:           Survey Disk                               VM#:     5769
AGENCY:                                                            PID#:  AC2179
SETTING CLASSIFICATION:  Concrete Bulkhead


The bench mark is set flush in the top of a concrete bulkhead near the west end
of the Port Boulevard bridge leading to the Port of Miami, 87 feet (27 m) north
of Bench Mark MH 16 1962, and 20 feet (6 m) south of the north end of the
bulkhead.



                         BENCH MARK STAMPING:  3165 B 1985

MONUMENTATION:           Survey Disk                               VM#:     5771
AGENCY:                                                            PID:         
SETTING CLASSIFICATION:  Concrete Seawall


The bench mark is set flush in the center of the top of the concrete seawall cap
which is parallel to Port Boulevard on the north side of Miamarina, 237 feet (72
m) west along the seawall from its east corner, 120 feet (37 m) east of the
inside west corner of the seawall at the NW corner of the marina, 37 feet (11 m)
south of the centerline of the eastbound lane of Port Boulevard, and 9.7 feet
(3.0 m) south of the north edge of the asphalt sidewalk along the seawall.

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

                                                   PUBLICATION DATE:  12/22/1986
Station ID: 8723165                                SUPERCEDED DATE:   04/21/2003
Name:       MIAMI, BISCAYNE BAY                               
            FLORIDA
NOAA Chart: 11468                                  Latitude:         25° 46.7' N
USGS Quad:  MIAMI                                  Longitude:        80° 11.1' W


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


                         BENCH MARK STAMPING:  MIAMI EL 15.491

MONUMENTATION:           PK Nail With Washer                       VM#:     5772
AGENCY:                                                            PID#:  AC2183
SETTING CLASSIFICATION:  Concrete Guard Rail


The bench mark is a nail with washer in the SW wing wall of the Port Boulevard
bridge leading to the Port of Miami, 35.6 feet (10.9 m) north of Bench Mark MH
16 RM 1 1962, 6.8 feet (2.1 m) south of the south curb of the bridge, 3.6 feet
(1.1 m) NE of the SW end of the wing wall, and 1 foot (0.3 m) above the
sidewalk.

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

                                                   PUBLICATION DATE:  12/22/1986
Station ID: 8723165                                SUPERCEDED DATE:   04/21/2003
Name:       MIAMI, BISCAYNE BAY                               
            FLORIDA
NOAA Chart: 11468                                  Latitude:         25° 46.7' N
USGS Quad:  MIAMI                                  Longitude:        80° 11.1' W


                            T I D A L   D A T U M S 


Tidal datums at MIAMI, BISCAYNE BAY based on:

     LENGTH OF SERIES:      12 MONTHS
     TIME PERIOD:           FEBRUARY 1985 - JANUARY 1986
     TIDAL EPOCH:           1960-1978
     CONTROL TIDE STATION:  8723080 HAULOVER PIER


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

     HIGHEST OBSERVED WATER LEVEL (09/16/1985)         =   3.81
     MEAN HIGHER HIGH WATER                     MHHW   =   2.40
     MEAN HIGH WATER                            MHW    =   2.34
     MEAN TIDE LEVEL                            MTL    =   1.24
   * NATIONAL GEODETIC VERTICAL DATUM           NGVD29 =   0.74
     MEAN LOW WATER                             MLW    =   0.14
     MEAN LOWER LOW WATER                       MLLW   =   0.00
     LOWEST  OBSERVED WATER LEVEL (04/07/1985)         =  -0.94

   * NGVD reference based on elevations published in Quad 250801, 1972, and NOS
     leveling of 1986. 
North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In FEET above:

     Stamping or Designation                    MLLW        MHW

     3165 A 1985                                 7.26      4.92
     MH 16 1962                                  6.44      4.10
     MH 16 RM 1 1962                             6.40      4.06
     MH 16 RM 2 1962                             6.15      3.81
     3165 B 1985                                 6.42      4.08
     MIAMI EL 15.491                            15.95     13.61


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

                                                   PUBLICATION DATE:  12/22/1986
Station ID: 8723165                                SUPERCEDED DATE:   04/21/2003
Name:       MIAMI, BISCAYNE BAY                               
            FLORIDA
NOAA Chart: 11468                                  Latitude:         25° 46.7' N
USGS Quad:  MIAMI                                  Longitude:        80° 11.1' W


                             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 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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