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Bench Mark Sheet for 8722004, SEBASTIAN INLET 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8722004                                PUBLICATION DATE:  05/16/2012
Name:       SEBASTIAN INLET                                   
            FLORIDA
NOAA Chart: 11476                                  Latitude:         27° 51.6' N
USGS Quad:  SEBASTIAN                              Longitude:        80° 26.9' W


To reach the tidal bench marks from the intersection of State Road 516 and State
Highway A1A in Indialantic, proceed 29 km (18 mi) SSE on State Highway A1A to
the bridge over Sebastian Inlet.  The bench marks are located on the Sebastian
Inlet bridge and on the pier supports beneath the bridge.  The tide gage and
staff were located on the north fender of the State Highway A1A bridge over
Sebastian Inlet.


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


                 PRIMARY BENCH MARK STAMPING:  NO 2 1969
                         DESIGNATION:          872 2004 TIDAL 2

MONUMENTATION:           Tidal Station disk                        VM#:     5396
AGENCY:                  US Coast and Geodetic Survey (USC&GS)     PID#:  AF3447
SETTING CLASSIFICATION:  Piling base


The primary bench mark is a disk set flush in the top of the most eastern piling
base of the sixth row of pilings (starting from the north end) under the bridge,
31.85 m (104.5 ft) NW of bench mark R 219 BREV 73, 3.20 m (10.5 ft) north of the
SE corner of the piling base, 1.40 m (4.6 ft) NE of the NE face of the most
eastern piling, and 0.30 m (1.0 ft) SW of the NE corner of the piling base.



                         BENCH MARK STAMPING:  V 304 1970
                         DESIGNATION:          V 304

MONUMENTATION:           Tidal Station disk                        VM#:     5397
AGENCY:                  Florida Department of Transportation (FLDT)PID#:  AF3450
SETTING CLASSIFICATION:  Concrete guardrail


The bench mark is a disk set flush in the top of the concrete gaurdrail at the
NW corner of the bridge, 0.91 m (3.0 ft) above the level of the bridge floor,
5.03 m (16.5 ft) west of the centerline of State Highway A1A, and 2.32 m (7.6
ft) south of the north end of the concrete guard rail.

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

                                                                                
Station ID: 8722004                                PUBLICATION DATE:  05/16/2012
Name:       SEBASTIAN INLET                                   
            FLORIDA
NOAA Chart: 11476                                  Latitude:         27° 51.6' N
USGS Quad:  SEBASTIAN                              Longitude:        80° 26.9' W


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


                         BENCH MARK STAMPING:  W 304 1970
                         DESIGNATION:          W 304

MONUMENTATION:           Bench Mark disk                           VM#:     5398
AGENCY:                  Florida Department of Transportation (FLDT)PID#:  AF3449
SETTING CLASSIFICATION:  Piling base


The bench mark is a disk set in the top of and near the NE corner of the most
eastern piling base of the fifth rows of piling (starting from the north end)
underneath the bridge, 52.43 m (172.0 ft) NW of bench mark R 219 BREV 73, 22.43
m (73.6 ft) north of bench mark NO 2 1969, 3.26 m (10.7 ft) north of the NE
corner of the piling base, 1.71 m (5.6 ft) NE of the NE face of the most eastern
piling, and 0.37 m (1.2 ft) SW of the back edge of a 0.15 m (0.5 ft) concrete
curb.



                         BENCH MARK STAMPING:  B 305 1970
                         DESIGNATION:          B 305

MONUMENTATION:           Bench Mark disk                           VM#:     5399
AGENCY:                  Florida Department of Transportation (FLDT)PID#:  AF3451
SETTING CLASSIFICATION:  Sidewalk


The bench mark is a disk set flush in the bridge sidewalk, located 46.82 m
(153.6 ft) south of the north end of the bridge, 4.63 m (15.2 ft) east of the
centerline of State Highway A1A, 0.15 m (0.5 ft) west of the west face of the
East Bannister of the bridge, and 0.24 m (0.8 ft) above the level of the bridge
floor.  

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

                                                                                
Station ID: 8722004                                PUBLICATION DATE:  05/16/2012
Name:       SEBASTIAN INLET                                   
            FLORIDA
NOAA Chart: 11476                                  Latitude:         27° 51.6' N
USGS Quad:  SEBASTIAN                              Longitude:        80° 26.9' W


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


                         BENCH MARK STAMPING:  R 219 BREV 73
                         DESIGNATION:          R 219

MONUMENTATION:           Bench Mark disk                           VM#:    19465
AGENCY:                  FL Department of Natural Resources (FLDNR) PID#:  AF6930
SETTING CLASSIFICATION:  Seawall


The bench mark is a disk set in the top of a seawall underneath a concrete cap
with a 2.13 m (7.0 ft) wide concrete sidewalk with a metal handrail and accessed
through a 6-inch plastic cap set flush with the sidewalk east of the bridge
spanning the Sebastian inlet, 54.25 m (178.0 ft) SE of bench mark W 304 1970,
31.85 m (104.5 ft) SE of bench mark NO 2 1969, 31.21 m (102.4 ft) NE of the SW
end of the seawall, 30.97 m (101.6 ft) NE of the extreme SW edge of the
sidewalk, 0.91 m (3.0 ft) north of the south edge of the sidewalk, and 0.67 m
(2.2 ft) north of the south edge of the seawall.



                         BENCH MARK STAMPING:  88 78 A 03
                         DESIGNATION:          88 78 A 03

MONUMENTATION:           Bench Mark disk                           VM#:    19466
AGENCY:                  FL Department of Transportation (FLDT)    PID#:  AF6822
SETTING CLASSIFICATION:  Concrete monument


The bench mark is a disk set in the top of a concrete monument flush with the
ground, 7.04 m (23.1 ft) west of the centerline of State Highway A1A, 6.13 m
(20.1 ft) NW of the north corner of the west concrete guardrail, 1.22 m (4.0 ft)
east of a carsonite witness post, and 0.18 m (0.6 ft) above the level of State
Highway A1A.

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

                                                                                
Station ID: 8722004                                PUBLICATION DATE:  05/16/2012
Name:       SEBASTIAN INLET                                   
            FLORIDA
NOAA Chart: 11476                                  Latitude:         27° 51.6' N
USGS Quad:  SEBASTIAN                              Longitude:        80° 26.9' W


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


                         BENCH MARK STAMPING:  88 78 A03 RM NO1
                         DESIGNATION:          88 78 A 03 RM 1 FLDNR

MONUMENTATION:           Bench Mark disk                           VM#:    19467
AGENCY:                  FL Department of Transportation (FLDT)    PID#:  AF6821
SETTING CLASSIFICATION:  Curb


The bench mark is a disk set flush in the top west concrete curb at the NW end
of the bridge spanning the Sebastian Inlet, 20.39 m (66.9 ft) NNE of bench mark
V 304 1970, 18.14 m (59.5 ft) NNE of the NW end of the concrete bridge
guardrail, 11.92 m (39.1 ft) NNE of a bench mark 88 78 A03, and 6.71 m (22.0 ft)
west of the centerline of State Highway A1A.

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

                                                                                
Station ID: 8722004                                PUBLICATION DATE:  05/16/2012
Name:       SEBASTIAN INLET                                   
            FLORIDA
NOAA Chart: 11476                                  Latitude:         27° 51.6' N
USGS Quad:  SEBASTIAN                              Longitude:        80° 26.9' W


                            T I D A L   D A T U M S 


Tidal datums at SEBASTIAN INLET based on:

     LENGTH OF SERIES:      1 YEAR
     TIME PERIOD:           August 1969 - July 1970
     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 (10/29/1969)         =  1.174
     MEAN HIGHER HIGH WATER                     MHHW   =  0.741
     North American Vertical Datum              NAVD88 =  0.741
     MEAN HIGH WATER                            MHW    =  0.683
     MEAN SEA LEVEL                             MSL    =  0.374
     MEAN TIDE LEVEL                            MTL    =  0.362
     MEAN LOW WATER                             MLW    =  0.041
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (04/24/1979)         = -0.347

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 2 1969                                   2.003    1.320
     V 304 1970                                  8.177    7.494
     W 304 1970                                  1.994    1.311
     B 305 1970                                  9.649    8.966
     R 219 BREV 73                               3.009    2.326
     88 78 A 03                                  6.724    6.041
     88 78 A03 RM NO1                            6.202    5.519


Foot Notes:

Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality control
standards for Second Order, Class 1 leveling.  It is advised that a confirmation
set of levels be established for bench marks 88 78 A 03, 88 78 A03 RM NO1, and R
219 BREV 73 to verify height differences before using tidal bench mark elevation
information.

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

                                                                                
Station ID: 8722004                                PUBLICATION DATE:  05/16/2012
Name:       SEBASTIAN INLET                                   
            FLORIDA
NOAA Chart: 11476                                  Latitude:         27° 51.6' N
USGS Quad:  SEBASTIAN                              Longitude:        80° 26.9' 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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Revised: 10/15/2013
NOAA / National Ocean Service
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