Bench Mark Sheet for 8726738, SAFETY HARBOR, OLD TAMPA BAY 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8726738                         PUBLICATION DATE:  04/21/2003
Name:       SAFETY HARBOR, OLD TAMPA BAY                      
            FL
NOAA Chart: 11413                           Latitude:   27° 59.3' N (  27.98830)
USGS Quad:  SAFETY HARBOR                   Longitude:  82° 41.1' W ( -82.68500)


To reach the tidal bench marks from the intersection of North Bayshore Drive and
South Boulevard in Safety Harbor, proceed south on South Boulevard for 0.2 km
(0.1 mi) to a marina.  The bench marks are along Main Street, South Boulevard,
and North Bayshore Drive near the marina.  The tide gage and staff were on the
city pier in the harbor beyond the east end of South Boulevard.


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


                 PRIMARY BENCH MARK STAMPING:  NO 1 1950
                         DESIGNATION:          872 6738 TIDAL 1

MONUMENTATION:           Bench Mark disk                       VM#:         7550
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG0994
SETTING CLASSIFICATION:  Concrete base                         OPUS PID:        
LATITUDE:   27° 59.4' N (  27.99000)          LONGITUDE:  82° 41.3' W ( -82.68830)


The primary bench mark is a disk set in the concrete base for an arch at
Baranoffs Health Resort, in line with the north half of Main Street, 13.56 m
(44.5 ft) SE of the centerline of North Bayshore Drive, 4 m (13 ft) north of the
extended centerline of Main Street, 1.68 m (5.5 ft) SE of the NW concrete block
pillar at the entrance to the resort, 0.2 m (0.5 ft) north of the archway, 0.2 m
(0.5 ft) from the edge of the step, and at sidewalk level.

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

                                                                                
Station ID: 8726738                         PUBLICATION DATE:  04/21/2003
Name:       SAFETY HARBOR, OLD TAMPA BAY                      
            FL
NOAA Chart: 11413                           Latitude:   27° 59.3' N (  27.98830)
USGS Quad:  SAFETY HARBOR                   Longitude:  82° 41.1' W ( -82.68500)


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


                         BENCH MARK STAMPING:  COURTNEY L
                         DESIGNATION:          COURTNEY L

MONUMENTATION:           Survey disk                           VM#:         7553
AGENCY:                  Pinellas County                       IDB PID#:  AG0467
SETTING CLASSIFICATION:  Concrete post                         OPUS PID:        
LATITUDE:   27° 59.3' N (  27.98830)          LONGITUDE:  82° 41.4' W ( -82.69000)


The bench mark is a disk set in the top of a concrete post, south of the
intersection of South Boulevard and South Bayshore Drive, 44.96 m (147.5 ft)
east of power light pole #9A-475, 42.06 m (138.0 ft) SE of the SE corner of a
sanitary sewer pumping station, 27.58 m (90.5 ft) SE of the centerline of South
Bayshore Drive, 25.91 m (85.0 ft) ENE of a 0.40 m (1.3 ft) palm tree, 23.16 m
(76.0 ft) SE of a 0.52 m (1.7 ft) diameter palm tree, and level with the ground.

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

                                                                                
Station ID: 8726738                         PUBLICATION DATE:  04/21/2003
Name:       SAFETY HARBOR, OLD TAMPA BAY                      
            FL
NOAA Chart: 11413                           Latitude:   27° 59.3' N (  27.98830)
USGS Quad:  SAFETY HARBOR                   Longitude:  82° 41.1' W ( -82.68500)


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


                         BENCH MARK STAMPING:  Y 31
                         DESIGNATION:          Y 31

MONUMENTATION:           Bench Mark disk                       VM#:         7554
AGENCY:                  US Coast and Geodetic Survey
                         (USC&GS)                              IDB PID#:  AG5385
SETTING CLASSIFICATION:  Concrete curb                         OPUS PID:        
LATITUDE:   27° 59.4' N (  27.99000)          LONGITUDE:  82° 41.2' W ( -82.68670)


The bench mark is a disk set in the top of the curb in front of Baronoffs Health
Resort, at the east end of and in line with the south side of Main Street, 31 m
(101 ft) east of the center of the intersection of Main Street and First Avenue,
2 m (8 ft) south of the centerline of Main Street, 0.12 m (0.4 ft) above the
level of the road, and 0.09 m (0.3 ft) below the level of the sidewalk.



                         BENCH MARK STAMPING:  6738 F 1990
                         DESIGNATION:          872 6738 F

MONUMENTATION:           Flange-encased Rod                    VM#:         7555
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   27° 59.3' N (  27.98830)          LONGITUDE:  82° 41.1' W ( -82.68500)


The bench mark is a flange encased rod located near the NE corner of the marina
parking lot, 12 m (41 ft) NW of the west end of the pier walkway, 8 m (25 ft) NE
of a 0.46 m x 1 m (1.5 ft x 2 ft) rectangular steel storm water catch basin in
the parking lot, 1.43 m (4.7 ft) west of the face of the east curb of the
parking lot, and 0.3 m (1.0 ft) south of the east-west 2 m (6 ft) high chain
link fence.  The datum point is 10 cm (0.4 ft) below ground level, being the top
of a stainless steel rod driven 20.1 m (66 ft) to refusal, and encased in a
5-inch diameter logo cap.  

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

                                                                                
Station ID: 8726738                         PUBLICATION DATE:  04/21/2003
Name:       SAFETY HARBOR, OLD TAMPA BAY                      
            FL
NOAA Chart: 11413                           Latitude:   27° 59.3' N (  27.98830)
USGS Quad:  SAFETY HARBOR                   Longitude:  82° 41.1' W ( -82.68500)


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


                         BENCH MARK STAMPING:  6738 G 1990
                         DESIGNATION:          872 6738 G

MONUMENTATION:           Flange-encased Rod                    VM#:         7556
AGENCY:                  National Ocean Service (NOS)          IDB PID#:        
SETTING CLASSIFICATION:  Stainless steel rod                   OPUS PID:        
LATITUDE:   27° 59.3' N (  27.98830)          LONGITUDE:  82° 41.1' W ( -82.68500)


The bench mark is a flange encased rod located near the NW corner of the marina
basin, 58.06 m (190.5 ft) east of the centerline of South Bayshore Drive, 4.51 m
(14.8 ft) south of the south edge of the east-west sidewalk along the south side
of the marina parking lot, 1.80 m (5.9 ft) east of a concrete light pole, and
0.46 m (1.5 ft) NW of the NW corner of a 1 m (4 ft) high chain link fence
surrounding the marina basin.  The datum point is 10 cm (0.4 ft) below ground
level, being the top of a stainless steel rod driven 20.1 m (66 ft) to refusal,
and encased in a 5- inch diameter logo cap.

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

                                                                                
Station ID: 8726738                         PUBLICATION DATE:  04/21/2003
Name:       SAFETY HARBOR, OLD TAMPA BAY                      
            FL
NOAA Chart: 11413                           Latitude:   27° 59.3' N (  27.98830)
USGS Quad:  SAFETY HARBOR                   Longitude:  82° 41.1' W ( -82.68500)


                            T I D A L   D A T U M S 


Tidal datums at SAFETY HARBOR, OLD TAMPA BAY based on:

     LENGTH OF SERIES:      5 Months
     TIME PERIOD:           January 1991 - May 1991
     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   =  0.850
     MEAN HIGH WATER                            MHW    =  0.744
     North American Vertical Datum              NAVD88 =  0.537
     MEAN SEA LEVEL                             MSL    =  0.452
     MEAN TIDE LEVEL                            MTL    =  0.452
     MEAN LOW WATER                             MLW    =  0.161
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     NO 1 1950                                   4.790    4.046
     COURTNEY L                                  1.155    0.411
     Y 31                                        4.721    3.977
     6738 F 1990                                 1.634    0.890
     6738 G 1990                                 1.649    0.905


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

                                                                                
Station ID: 8726738                         PUBLICATION DATE:  04/21/2003
Name:       SAFETY HARBOR, OLD TAMPA BAY                      
            FL
NOAA Chart: 11413                           Latitude:   27° 59.3' N (  27.98830)
USGS Quad:  SAFETY HARBOR                   Longitude:  82° 41.1' W ( -82.68500)


                             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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