Bench Mark Sheet for 8726467, MARSH BRANCH, RUSKIN 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Superseded Epoch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Small blue map location marker Unpublished bench mark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  5

                                                                                
Station ID: 8726467                         PUBLICATION DATE:  02/05/2004
Name:       MARSH BRANCH, RUSKIN                              
            FL
NOAA Chart: 11412                           Latitude:   27° 43.1' N (  27.71830)
USGS Quad:  RUSKIN                          Longitude:  82° 27.2' W ( -82.45330)


To reach the tidal bench marks from the intersection of U.S. Highway 41 (Tamiami
Trail) and Shell Point Road in Ruskin, proceed west on Shell Point Road for 1.3
km (0.8 mi) to Yost Trailer Park.  The bench marks are located in the area
around the trailer park.  The tide gage and staff were located on a pier behind
the trailer park.


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


                 PRIMARY BENCH MARK STAMPING:  6467 B 1977
                         DESIGNATION:          872 6467 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6508
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7515
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID#: AG7515
LATITUDE:   27° 43.2' N (  27.72000)          LONGITUDE:  82° 26.9' W ( -82.44830)


The primary bench mark is a disk set in the top of a concrete sea wall, 10.52 m
(34.5 ft) south of the centerline of the paved road around the trailer park, 5 m
(18 ft) south of the north end of the boat ramp, and 0.18 m (0.6 ft) west of the
west edge of the boat ramp.



                         BENCH MARK STAMPING:  6467 C 1977
                         DESIGNATION:          872 6467 C TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6509
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7514
SETTING CLASSIFICATION:  Concrete boatlift platform            OPUS PID#: AG7514
LATITUDE:   27° 43.2' N (  27.72000)          LONGITUDE:  82° 26.9' W ( -82.44830)


The bench mark is a disk set in the SE corner of the boatlift platform, 8.69 m
(28.5 ft) west of the centerline of the paved road around the trailer park, 2.53
m (8.3 ft) east of the center of the boatlift, and 0.3 m (1 ft) west of the east
side of the boatlift.

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

                                                                                
Station ID: 8726467                         PUBLICATION DATE:  02/05/2004
Name:       MARSH BRANCH, RUSKIN                              
            FL
NOAA Chart: 11412                           Latitude:   27° 43.1' N (  27.71830)
USGS Quad:  RUSKIN                          Longitude:  82° 27.2' W ( -82.45330)


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


                         BENCH MARK STAMPING:  6467 E 1977
                         DESIGNATION:          872 6467 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         6510
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG7513
SETTING CLASSIFICATION:  Copper-clad steel rod                 OPUS PID:        
LATITUDE:   27° 43.2' N (  27.72000)          LONGITUDE:  82° 26.9' W ( -82.44830)


The bench mark is a disk located 37 m (120 ft) NW of the NW corner of the Ruskin
Drive-in Restaurant, 8.08 m (26.5 ft) north of the centerline of Shell Point
Road, 0.49 m (1.6 ft) east of telephone pole #25, and 0.24 m (0.8 ft) south of a
witness post.  The bench mark is crimped to the top of a copper-clad steel rod
driven 12.2 m (40 ft) to refusal, encased in a PVC pipe and concrete kickblock.

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

                                                                                
Station ID: 8726467                         PUBLICATION DATE:  02/05/2004
Name:       MARSH BRANCH, RUSKIN                              
            FL
NOAA Chart: 11412                           Latitude:   27° 43.1' N (  27.71830)
USGS Quad:  RUSKIN                          Longitude:  82° 27.2' W ( -82.45330)


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


                         BENCH MARK STAMPING:  Y 261 1966
                         DESIGNATION:          Y 261

MONUMENTATION:           Bench Mark disk                       VM#:         6511
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG6211
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   27° 43.2' N (  27.72000)          LONGITUDE:  82° 26.9' W ( -82.44830)


The bench mark is a disk set in the top of a concrete monument located in front
of Yost Trailer Park, 42.67 m (140.0 ft) SW of the SW corner of the Shop-and-Go
food store, 7.99 m (26.2 ft) north of the centerline of Shell Point Road, 0.37 m
(1.2 ft) west of telephone pole #27, and 0.21 m (0.7 ft) south of a witness
post.

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

                                                                                
Station ID: 8726467                         PUBLICATION DATE:  02/05/2004
Name:       MARSH BRANCH, RUSKIN                              
            FL
NOAA Chart: 11412                           Latitude:   27° 43.1' N (  27.71830)
USGS Quad:  RUSKIN                          Longitude:  82° 27.2' W ( -82.45330)


                            T I D A L   D A T U M S 


Tidal datums at MARSH BRANCH, RUSKIN based on:

     LENGTH OF SERIES:      2 MONTHS
     TIME PERIOD:           March 1977 - April 1977
     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:

     MEAN HIGHER HIGH WATER                     MHHW   =  0.658
     MEAN HIGH WATER                            MHW    =  0.599
     North American Vertical Datum              NAVD88 =  0.416
     MEAN SEA LEVEL                             MSL    =  0.341
     MEAN TIDE LEVEL                            MTL    =  0.335
     MEAN LOW WATER                             MLW    =  0.070
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     6467 B 1977                                 1.084    0.485
     6467 C 1977                                 1.341    0.742
     6467 E 1977                                 1.718    1.119
     Y 261 1966                                  1.654    1.055


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

                                                                                
Station ID: 8726467                         PUBLICATION DATE:  02/05/2004
Name:       MARSH BRANCH, RUSKIN                              
            FL
NOAA Chart: 11412                           Latitude:   27° 43.1' N (  27.71830)
USGS Quad:  RUSKIN                          Longitude:  82° 27.2' W ( -82.45330)


                             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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