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Bench Mark Sheet for 8726667, Mckay Bay Entrance 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8726667                         PUBLICATION DATE:  12/11/2017
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


To reach the tidal bench marks from the intersection of U.S. Highway 41 and
Causeway Boulevard (U.S. Business 41), proceed west on Causeway Boulevard for
1.6 km (1.0 mi) to the access road for Rockport Terminal, then go south on the
access road for 1.1 km (0.7 mi) to the Rockport Terminal.  The bench marks are
located around the terminal between the loading dock and railroad tracks.  The
tide gauge is located at the south end of the loading dock west of the conveyor
building.


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


                 PRIMARY BENCH MARK STAMPING:  6667 J 1991
                         DESIGNATION:          872 6667 J

MONUMENTATION:           Tidal Station disk                    VM#:         6825
AGENCY:                  National Ocean Service (NOS)          IDB PID#:  DL1851
SETTING CLASSIFICATION:  Concrete foundation of loader stop    OPUS PID:        
LATITUDE:   27° 54.8' N (  27.91344)          LONGITUDE:  82° 25.4' W ( -82.42414)


The primary bench mark is a disk set in the SW corner of the concrete foundation
of a stop for the bulk loader that travels on rails along the waterfront, 18.41
m (60.40 ft) NE of the NE corner of the concrete walkway leading to the dock,
3.72 m (12.20 ft) WNW of the west rail of the bulk loader, and 0.91 m (2.99 ft)
WSW of the SW corner of the stop.

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

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/11/2017
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


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


                         BENCH MARK STAMPING:  6667 C 1976
                         DESIGNATION:          872 6667 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6820
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7506
SETTING CLASSIFICATION:  sidewalk                              OPUS PID:        
LATITUDE:   27° 54.9' N (  27.91531)          LONGITUDE:  82° 25.3' W ( -82.42233)


The bench mark is a disk set on the concrete porch located along the SE wall of
the Seaboard Coastline Railroad terminal office, SE of the boat mooring area,
75.3 m (247.0 ft) west of bench mark 6667 E 1976, 7.99 m (26.21 ft) SW of the
east corner of the building, and 0.85 m (2.79 ft) SE of the SE wall of the
building.



                         BENCH MARK STAMPING:  6667 E 1976
                         DESIGNATION:          872 6667 E

MONUMENTATION:           Tidal Station disk                    VM#:         6821
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  DL1806
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID#: DL1806
LATITUDE:   27° 54.9' N (  27.91572)          LONGITUDE:  82° 25.3' W ( -82.42178)


The bench mark is a disk located at power pole #1north of the paved access road
leading to the boat landing area at Rockport Terminal, 183.00 m (600.39 ft) west
of bench mark 6667 F 1976, 6.7 m (22.0 ft) north of the centerline of the access
road, 2.01 m (6.59 ft) east of the east face power pole #11, and in line with
the poles.  The bench mark is set just below ground level, crimped to a copper
coated steel rod driven to an unspecified depth, and encased in a PVC pipe with
concrete kickblock.

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

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/11/2017
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


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


                         BENCH MARK STAMPING:  6667 F 1976
                         DESIGNATION:          872 6667 F TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6822
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7504
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   27° 55.0' N (  27.91661)          LONGITUDE:  82° 25.2' W ( -82.42022)


The bench mark is a disk located on the north side of the access road near the
Guard Shack and the entrance gate, 29.40 m (96.45 ft) WSW of the NS fence line,
6.15 m (20.17 ft) NNW of a chainlink fence 0.38 m (1.24 ft) west of power pole
number 9 with a light, the last pole on the NE end of the property, and 0.3 m
(0.98 ft) above road level.  The bench mark is crimped to a copper-coated steel
rod driven 12.2 m (40.0 ft) to refusal, and encased in a PVC pipe with concrete
kickblock.



                         BENCH MARK STAMPING:  6667 G 1990
                         DESIGNATION:          872 6667 G

MONUMENTATION:           Tidal Station disk                    VM#:         6823
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Mooring bollard base                  OPUS PID#: DL1807
LATITUDE:   27° 55.0' N (  27.91711)          LONGITUDE:  82° 25.3' W ( -82.42178)


The bench mark is a disk set in the SW corner of the concrete base of a mooring
bollard located near the NE end of the loading dock, 28.29 m (92.81 ft) NW of
the NW corner of the restroom building, 23.9 m (78.4 ft) NW of power pole
#2636940260, 2.80 m (9.19 ft) north of the centerline of the concrete ramp
leading to the dock, 1.98 m (6.50 ft) west of the top edge of the riprap sea
wall, and 0.18 m (0.59 ft) above ground.

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

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/11/2017
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


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


                         BENCH MARK STAMPING:  6667 H 1990
                         DESIGNATION:          872 6667 H

MONUMENTATION:           Tidal Station disk                    VM#:         6824
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   27° 55.1' N (  27.91767)          LONGITUDE:  82° 25.2' W ( -82.41958)


The bench mark is a disk set in the SE corner of the concrete foundation of a
steel arm structure located at the railroad unloading building,13.5 m (44.4 ft)
west of the centerline of the access road, 6.68 m (21.90 ft) NE of the NE corner
of the railroad unloading buidling, 7.8 m (25.5 ft) east of power pole
#644540245, and 0.15 m (0.49 ft) above ground level.

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

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/11/2017
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


                            T I D A L   D A T U M S 


Tidal datums at CSX ROCKPORT, MCKAY BAY ENTRANCE based on:

     LENGTH OF SERIES:      11 YEARS
     TIME PERIOD:           1/99-12/07 & 1/15-12/16
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8726520 ST. PETERSBURG, TAMPA BAY


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

     HIGHEST OBSERVED WATER LEVEL (10/08/1996)         =  2.130
     MEAN HIGHER HIGH WATER                     MHHW   =  0.816
     MEAN HIGH WATER                            MHW    =  0.715
     North American Vertical Datum              NAVD88 =  0.508
     MEAN SEA LEVEL                             MSL    =  0.442
     MEAN TIDE LEVEL                            MTL    =  0.434
     MEAN LOW WATER                             MLW    =  0.153
     MEAN LOWER LOW WATER                       MLLW   =  0.000
     LOWEST  OBSERVED WATER LEVEL (09/11/2017)         = -1.415

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     6667 J 1991                                 3.039    2.324
     6667 C 1976                                 3.104    2.389
     6667 E 1976                                 2.784    2.069
     6667 F 1976                                 3.202    2.487
     6667 G 1990                                 2.847    2.132
     6667 H 1990                                 3.371    2.656


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

                                                                                
Station ID: 8726667                         PUBLICATION DATE:  12/11/2017
Name:       CSX ROCKPORT, MCKAY BAY ENTRANCE                  
            FL
NOAA Chart: 11412                           Latitude:   27° 54.8' N (  27.91333)
USGS Quad:  TAMPA                           Longitude:  82° 25.5' W ( -82.42500)


                             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 8726667 Mckay Bay Entrance, FL

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