Bench Mark Sheet for 8727328, OZELLO NORTH 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Superseded Epoch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Small blue map location marker Unpublished bench mark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: 8727328                         PUBLICATION DATE:  05/21/2004
Name:       OZELLO NORTH                                      
            FL
NOAA Chart: 11409                           Latitude:   28° 51.8' N (  28.86330)
USGS Quad:  OZELLO                          Longitude:  82° 40.0' W ( -82.66670)


To reach the tidal bench marks from the Homosassa Springs Post Office, proceed
north on U.S. Highway 19 for 5.5 km (3.4 mi) to the junction with West Ozello
Trail (County Road C-494), then turn left and proceed west on West Ozello Trail
for 14.8 km (9.2 mi) to the last causeway before the road ends at a "T"
Junction.  The bench marks are along the causeway and road.  The tide gage and
staff were located on the State of Florida wharf.


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


                 PRIMARY BENCH MARK STAMPING:  7328 D 1978
                         DESIGNATION:          872 7328 D TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         7783
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AL7743
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID#: AL7743
LATITUDE:   28° 51.8' N (  28.86330)          LONGITUDE:  82° 40.1' W ( -82.66830)


The primary bench mark is a disk located at the SW end of the causeway, 103 m
(338 ft) south of bench mark 7328 B 1978,  26 m (86 ft) NW of the NW corner of
Pecks Old Port Cove Restuarant, 5.43 m (17.8 ft) WSW of the centerline of South
Ozello Trail (County Road C-494), and 0.85 m (2.8 ft) ENE of powerline pole
#037.  The bench mark is crimped to the top of a galvanized steel rod driven 0.9
m (3 ft) to refusal, and encased in a PVC pipe and concrete kickblock.

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

                                                                                
Station ID: 8727328                         PUBLICATION DATE:  05/21/2004
Name:       OZELLO NORTH                                      
            FL
NOAA Chart: 11409                           Latitude:   28° 51.8' N (  28.86330)
USGS Quad:  OZELLO                          Longitude:  82° 40.0' W ( -82.66670)


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


                         BENCH MARK STAMPING:  7328 A 1978
                         DESIGNATION:          872 7328 A TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         7780
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AL7745
SETTING CLASSIFICATION:  Concrete bulkhead                     OPUS PID:        
LATITUDE:   28° 51.9' N (  28.86500)          LONGITUDE:  82° 40.1' W ( -82.66830)


The bench mark is a disk set in the concrete bulkhead for the causeway, 5.18 m
(17.0 ft) west of the centerline of North Ozello Trail (County Road C-494), 0.76
m (2.5 ft) east of the west edge of the causeway, and 1 m (3 ft) below the level
of the road.



                         BENCH MARK STAMPING:  7328 B 1978
                         DESIGNATION:          872 7328 B TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         7781
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AL7744
SETTING CLASSIFICATION:  Concrete foundation                   OPUS PID:        
LATITUDE:   28° 51.9' N (  28.86500)          LONGITUDE:  82° 40.1' W ( -82.66830)


The bench mark is a disk set in the top of a concrete piling foundation located
at the east edge of the causeway, 63 m (206 ft) south of bench mark 7328 A 1978,
33 m (109 ft) south of the powerline pole near the center of the causeway, 4.66
m (15.3 ft) east of the centerline of North Ozello Trail (County Road C-494),
0.58 m (1.9 ft) west of the causeway.

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

                                                                                
Station ID: 8727328                         PUBLICATION DATE:  05/21/2004
Name:       OZELLO NORTH                                      
            FL
NOAA Chart: 11409                           Latitude:   28° 51.8' N (  28.86330)
USGS Quad:  OZELLO                          Longitude:  82° 40.0' W ( -82.66670)


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


                         BENCH MARK STAMPING:  7328 E 1978
                         DESIGNATION:          872 7328 E TIDAL

MONUMENTATION:           Tidal Station disk                    VM#:         7784
AGENCY:                  National Ocean Survey (NOS)           IDB PID#:  AL7741
SETTING CLASSIFICATION:  Galvanized steel rod                  OPUS PID:        
LATITUDE:   28° 51.7' N (  28.86170)          LONGITUDE:  82° 40.1' W ( -82.66830)


The bench mark is a disk located along South Ozello Trail south of the causeway,
142 m (467 ft) south of bench mark 7328 C 1978, 31 m (102 ft) north of a sand
track driveway leading to Route 1 Box 302, 6.43 m (21.1 ft) NE of the centerline
of South Ozello Trail (County Road C-494), 5.43 m (17.8 ft) SE of the centerline
of a gravel driveway leading to Route 1 Box 725, and 1.77 m (5.8 ft) south of
powerline pole #112 with a witness sign.  The bench mark is crimped to the top
of a galvanized steel rod driven 1.5 m (5 ft) to refusal, and encased in a PVC
pipe and concrete kickblock.

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

                                                                                
Station ID: 8727328                         PUBLICATION DATE:  05/21/2004
Name:       OZELLO NORTH                                      
            FL
NOAA Chart: 11409                           Latitude:   28° 51.8' N (  28.86330)
USGS Quad:  OZELLO                          Longitude:  82° 40.0' W ( -82.66670)


                            T I D A L   D A T U M S 


Tidal datums at OZELLO NORTH based on:

     LENGTH OF SERIES:      4 MONTHS
     TIME PERIOD:           June 1978 - September 1978
     TIDAL EPOCH:           1983-2001
     CONTROL TIDE STATION:  8727520 CEDAR KEY, GULF OF MEXICO


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

     MEAN HIGHER HIGH WATER                     MHHW   =  0.616
     MEAN HIGH WATER                            MHW    =  0.515
     MEAN TIDE LEVEL                            MTL    =  0.285
     North American Vertical Datum              NAVD88 =  0.276
     MEAN SEA LEVEL                             MSL    =  0.256
     MEAN LOW WATER                             MLW    =  0.055
     MEAN LOWER LOW WATER                       MLLW   =  0.000

North American Vertical Datum (NAVD88)

Bench Mark Elevation Information                In METERS above:

     Stamping or Designation                    MLLW        MHW

     7328 D 1978                                 1.275    0.760
     7328 A 1978                                 0.972    0.457
     7328 B 1978                                 1.754    1.239
     7328 E 1978                                 0.871    0.356


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

                                                                                
Station ID: 8727328                         PUBLICATION DATE:  05/21/2004
Name:       OZELLO NORTH                                      
            FL
NOAA Chart: 11409                           Latitude:   28° 51.8' N (  28.86330)
USGS Quad:  OZELLO                          Longitude:  82° 40.0' W ( -82.66670)


                             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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