NOAA Web Site Link Tides and Currents Home Page Transparent placeholder image

Bench Mark Sheet for 8726706, CLEARWATER, CLEARWATER HARBOR 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8726706                         PUBLICATION DATE:  04/29/2004
Name:       CLEARWATER, CLEARWATER HARBOR                     
            FL
NOAA Chart: 11410                           Latitude:   27° 57.3' N (  27.95500)
USGS Quad:  CLEARWATER                      Longitude:  82° 48.4' W ( -82.80670)


To reach the tidal bench marks from the intersection of U.S. Alternate Highway
19 (Fort Harrison Avenue) and State Road 697 (Bellview Avenue), proceed west on
Bellview Avenue for 0.6 km (0.4 mi) to Druid Road South, then north on Druid
Road South for 1.3 km (0.8 mi) to Magnolia Road, then west on Magnolia Road to
its end.   The bench marks are along Magnolia Road and Druid Road South.  The
tide gage and staff were on the pier at the end of Magnolia Road.


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


                 PRIMARY BENCH MARK STAMPING:  TBM NO 1 1949
                         DESIGNATION:          872 6706 TIDAL 1

MONUMENTATION:           Tidal Station disk                    VM#:         6786
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG0992
SETTING CLASSIFICATION:  Concrete sea wall                     OPUS PID:        
LATITUDE:   27° 57.2' N (  27.95330)          LONGITUDE:  82° 48.4' W ( -82.80670)


The primary bench mark is a disk set on a concrete sea wall at the foot of the
west end of Magnolia Road, 6.98 m (22.9 ft) south of the south hand rail of the
walkway to the Harbor Oaks Pier, 8.84 m (29.0 ft) south of the extended
centerline of Magnolia Road, and 6.10 m (20.0 ft) ESE of powerline pole
#6A-11314, and 0.49 m (1.6 ft) north of the concrete wall.

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

                                                                                
Station ID: 8726706                         PUBLICATION DATE:  04/29/2004
Name:       CLEARWATER, CLEARWATER HARBOR                     
            FL
NOAA Chart: 11410                           Latitude:   27° 57.3' N (  27.95500)
USGS Quad:  CLEARWATER                      Longitude:  82° 48.4' W ( -82.80670)


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


                         BENCH MARK STAMPING:  TBM NO 2 1949
                         DESIGNATION:          872 6706 TIDAL 2

MONUMENTATION:           Tidal Station disk                    VM#:         6787
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG0998
SETTING CLASSIFICATION:  Concrete curb                         OPUS PID:        
LATITUDE:   27° 57.2' N (  27.95330)          LONGITUDE:  82° 48.4' W ( -82.80670)


The bench mark is a disk set in the north curb at the west end of Magnolia Road,
6.55 m (21.5 ft) east of the edge of the sea wall, 7.19 m (23.6 ft) north of the
centerline of Magnolia Road, and 3.57 m (11.7 ft) west of the centerline of the
driveway.



                         BENCH MARK STAMPING:  NO 5 1975
                         DESIGNATION:          872 6706 TIDAL 5

MONUMENTATION:           Bench Mark disk                       VM#:         6788
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AG1003
SETTING CLASSIFICATION:  Concrete curb                         OPUS PID:        
LATITUDE:   27° 57.2' N (  27.95330)          LONGITUDE:  82° 48.3' W ( -82.80500)


The bench mark is a disk set in the curb at the SE corner of the intersection of
Magnolia Road and Druid Road, 10.45 m (34.3 ft) east of the centerline of Druid
Road, 3 m (10 ft) south of the centerline of Magnolia Road, and 6.71 m (22.0 ft)
NNE of a 1 m (2 ft) diameter oak tree.  NOTE: Mark not found in 1996 by US Power
Squadron.

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

                                                                                
Station ID: 8726706                         PUBLICATION DATE:  04/29/2004
Name:       CLEARWATER, CLEARWATER HARBOR                     
            FL
NOAA Chart: 11410                           Latitude:   27° 57.3' N (  27.95500)
USGS Quad:  CLEARWATER                      Longitude:  82° 48.4' W ( -82.80670)


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


                         BENCH MARK STAMPING:  HARRIS O
                         DESIGNATION:          HARRIS O

MONUMENTATION:           Survey disk                           VM#:         6789
AGENCY:                  Pinellas County (FL-103)              IDB PID#:  AG0586
SETTING CLASSIFICATION:  Concrete monument                     OPUS PID:        
LATITUDE:   27° 57.3' N (  27.95500)          LONGITUDE:  82° 48.3' W ( -82.80500)


The bench mark is a disk set in the top of a concrete monument, 1 block south of
bench mark NO 5 1975, 10.36 m (34.0 ft) south of the centerline of Lotus Path,
4.24 m (13.9 ft) west of the centerline of Druid Road, and 0.79 m (2.6 ft) WSW
of a witness post.

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

                                                                                
Station ID: 8726706                         PUBLICATION DATE:  04/29/2004
Name:       CLEARWATER, CLEARWATER HARBOR                     
            FL
NOAA Chart: 11410                           Latitude:   27° 57.3' N (  27.95500)
USGS Quad:  CLEARWATER                      Longitude:  82° 48.4' W ( -82.80670)


                            T I D A L   D A T U M S 


Tidal datums at CLEARWATER, CLEARWATER HARBOR based on:

     LENGTH OF SERIES:      11 MONTHS
     TIME PERIOD:           November 1975 - September 1976
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8726724 CLEARWATER BEACH, GULF OF MEXICO


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.836
     MEAN HIGH WATER                            MHW    =  0.730
     North American Vertical Datum              NAVD88 =  0.535
     MEAN SEA LEVEL                             MSL    =  0.445
     MEAN TIDE LEVEL                            MTL    =  0.442
     MEAN LOW WATER                             MLW    =  0.154
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     TBM NO 1 1949                               1.364    0.634
     TBM NO 2 1949                               1.509    0.779
     NO 5 1975                                   8.781    8.051
     HARRIS O                                    7.772    7.042


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

                                                                                
Station ID: 8726706                         PUBLICATION DATE:  04/29/2004
Name:       CLEARWATER, CLEARWATER HARBOR                     
            FL
NOAA Chart: 11410                           Latitude:   27° 57.3' N (  27.95500)
USGS Quad:  CLEARWATER                      Longitude:  82° 48.4' W ( -82.80670)


                             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.

Return to Top
Products available at 8726706 CLEARWATER, CLEARWATER HARBOR, FL

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