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.