U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8726217 PUBLICATION DATE: 05/12/2011 Name: CORTEZ, SARASOTA BAY FL NOAA Chart: 11424 Latitude: 27° 28.0' N ( 27.46670) USGS Quad: BRADENTON BEACH Longitude: 82° 41.2' W ( -82.68670) To reach the tidal bench marks from the Cortez Post Office, proceed west on State Road 684 (Cortez Road West) for 0.6 km (0.4 mi) to Cortez Fishing Center on the left. The bench marks are north and south sides of State Road 684 at the bridge over Anna Maria Sound, and at the US Coast Guard Station. The tide gage and staff were located off the dock of Cortez Marina. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: NO 1 1953 DESIGNATION: 872 6217 TIDAL 1 MONUMENTATION: Tidal Station disk VM#: 6139 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AG2000 SETTING CLASSIFICATION: Concrete sea wall OPUS PID#: AG2000 LATITUDE: 27° 28.0' N ( 27.46670) LONGITUDE: 82° 41.3' W ( -82.68830) The primary bench mark is a disk set in the top of a concrete sea wall located behind the U.S. Coast Guard Station in Cortez, 24.84 m (81.5 ft) SW of the SW corner of the station, 19.51 m (64.0 ft) ESE of the flagpole, 7.92 m (26.0 ft) west of the centerline of the black-topped walk leading to the north end of the fishing pier. NOTE: Mark is painted yellow.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8726217 PUBLICATION DATE: 05/12/2011 Name: CORTEZ, SARASOTA BAY FL NOAA Chart: 11424 Latitude: 27° 28.0' N ( 27.46670) USGS Quad: BRADENTON BEACH Longitude: 82° 41.2' W ( -82.68670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: NO 2 1953 DESIGNATION: 872 6217 TIDAL 2 MONUMENTATION: Tidal Station disk VM#: 6144 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AG1999 SETTING CLASSIFICATION: Concrete sea wall OPUS PID#: AG1999 LATITUDE: 27° 28.0' N ( 27.46670) LONGITUDE: 82° 41.2' W ( -82.68670) The bench mark is a disk set flush in the top of a concrete seawall behind the U.S. Coast Guard Station, 21.3 m (69.8 ft) WNW of bench mark NO 1 1953, 13.3 m (43.5 ft) west of the west edge of a concrete slab for a diesel tank, 3.0 m (9.8 ft) SSW of the south end of an 2.4 m (8.0 ft) chain link fence, and 0.8 m (2.5 ft) north of where the seawall makes a right angle turn. BENCH MARK STAMPING: NO 3 1953 DESIGNATION: 872 6217 TIDAL 3 MONUMENTATION: Tidal Station disk VM#: 6145 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AG1998 SETTING CLASSIFICATION: Concrete slab OPUS PID: LATITUDE: 27° 28.0' N ( 27.46670) LONGITUDE: 82° 41.2' W ( -82.68670) The bench mark is a disk set flush in the top of a concrete slab near the SW corner of the house about 0.3 m (1.0 ft) above the level of Bayview Avenue, 23.2 m (76.0 ft) east of the centerline of 124th Street Court West, and 14.2 m (46.5 ft) north of the centerline of Bay View Avenue.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8726217 PUBLICATION DATE: 05/12/2011 Name: CORTEZ, SARASOTA BAY FL NOAA Chart: 11424 Latitude: 27° 28.0' N ( 27.46670) USGS Quad: BRADENTON BEACH Longitude: 82° 41.2' W ( -82.68670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: K 254 1965 DESIGNATION: K 254 MONUMENTATION: Bench Mark disk VM#: 6146 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AG1995 SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID: LATITUDE: 27° 28.1' N ( 27.46830) LONGITUDE: 82° 41.3' W ( -82.68830) The bench mark is a disk set in the top of the south end of the east concrete abutment of the bridge, 6.25 m (20.5 ft) south of the center line of the highway, and about level with the highway. BENCH MARK STAMPING: 6217 B 1977 DESIGNATION: 872 6217 B TIDAL MONUMENTATION: Tidal Station disk VM#: 6148 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7727 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 27° 28.1' N ( 27.46830) LONGITUDE: 82° 41.5' W ( -82.69170) The bench mark is a disk set in the bulkhead on the south side of the bridge, 0.40 m (1.3 ft) west of the SE end of the bulkhead, 8.32 m (27.3 ft) SW of power pole 12707, 13 m (43 ft) south of the SE corner of the bridge, and 3 m (10 ft) below road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8726217 PUBLICATION DATE: 05/12/2011 Name: CORTEZ, SARASOTA BAY FL NOAA Chart: 11424 Latitude: 27° 28.0' N ( 27.46670) USGS Quad: BRADENTON BEACH Longitude: 82° 41.2' W ( -82.68670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 6217 C 1977 DESIGNATION: 872 6217 C TIDAL MONUMENTATION: Tidal Station disk VM#: 6149 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7728 SETTING CLASSIFICATION: Concrete sea wall OPUS PID: LATITUDE: 27° 28.1' N ( 27.46830) LONGITUDE: 82° 41.5' W ( -82.69170) The bench mark is a disk set in the south seawall of a boat basin on the north side of the bridge, 3.54 m (11.6 ft) west of the east end of the seawall, 16.76 m (55 ft) WNW of power transformer 13R363223, 19.51 m (64.0 ft) north of the centerline of State Road 684, and 2.44 m (8 ft) below road.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8726217 PUBLICATION DATE: 05/12/2011 Name: CORTEZ, SARASOTA BAY FL NOAA Chart: 11424 Latitude: 27° 28.0' N ( 27.46670) USGS Quad: BRADENTON BEACH Longitude: 82° 41.2' W ( -82.68670) T I D A L B E N C H M A R K S BENCH MARK STAMPING: J 254 1965 DESIGNATION: J 254 MONUMENTATION: Bench Mark disk VM#: 19865 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AG1981 SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID: LATITUDE: 27° 28.1' N ( 27.46811) LONGITUDE: 82° 41.9' W ( -82.69789) The bench mark is a disk set in the west bridge abutment on the north side of the road, 6.10 m (20 ft) north of the center of Cortez road, and 0.43 m (1.4 ft) south of the north edge of the abutment.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8726217 PUBLICATION DATE: 05/12/2011 Name: CORTEZ, SARASOTA BAY FL NOAA Chart: 11424 Latitude: 27° 28.0' N ( 27.46670) USGS Quad: BRADENTON BEACH Longitude: 82° 41.2' W ( -82.68670) T I D A L D A T U M S Tidal datums at CORTEZ, SARASOTA BAY based on: LENGTH OF SERIES: 5 MONTHS TIME PERIOD: June 1990 - October 1990 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 = 0.637 MEAN HIGH WATER MHW = 0.548 North American Vertical Datum NAVD88 = 0.473 MEAN SEA LEVEL MSL = 0.333 MEAN TIDE LEVEL MTL = 0.326 MEAN LOW WATER MLW = 0.104 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 1953 1.445 0.897 NO 2 1953 1.459 0.911 NO 3 1953 1.775 1.227 K 254 1965 4.707 4.159 6217 B 1977 1.568 1.020 6217 C 1977 1.572 1.024 J 254 1965 4.579 4.031 Foot Notes: Geodetic heights of the bench marks meet all NOAA/NOS/NGS quality control standards for Second Order, Class 1 leveling. It is advised that a confirmation set of levels be established for bench mark J 254 1965 to verify height differences before using tidal bench mark elevation information.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 7 of 7 Station ID: 8726217 PUBLICATION DATE: 05/12/2011 Name: CORTEZ, SARASOTA BAY FL NOAA Chart: 11424 Latitude: 27° 28.0' N ( 27.46670) USGS Quad: BRADENTON BEACH Longitude: 82° 41.2' W ( -82.68670) 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.