U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8725667 PUBLICATION DATE: 04/27/2012 Name: PLACIDA, GASPARILLA SOUND FL NOAA Chart: 11426 Latitude: 26° 50.0' N ( 26.83330) USGS Quad: PLACIDA Longitude: 82° 15.9' W ( -82.26500) To reach the tidal bench marks proceed on County Road 771 to the Coral Creek Bridge over Coral Creek in Placida. The bench marks are located along the sides of the road. The tide gage and staff were located on the dock at the SW corner of the bridge. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5667 B 1977 DESIGNATION: 872 5667 B TIDAL MONUMENTATION: Tidal Station disk VM#: 7379 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7783 SETTING CLASSIFICATION: Concrete abutment OPUS PID: LATITUDE: 26° 50.0' N ( 26.83330) LONGITUDE: 82° 15.8' W ( -82.26330) The primary bench mark is a disk set flush in the SW abutment of the County Road 771 bridge over Coral Creek, 130 m (425 ft) north of the Placida Post Office, 5.64 m (18.5 ft) NW of the centerline of the highway, and 0.46 m (1.5 ft) NW of the west corner of the bridge. BENCH MARK STAMPING: 5667 A RESET 1982 DESIGNATION: 872 5667 A TIDAL RESET MONUMENTATION: Tidal Station disk VM#: 7380 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7785 SETTING CLASSIFICATION: Concrete step OPUS PID: LATITUDE: 26° 50.0' N ( 26.83330) LONGITUDE: 82° 15.8' W ( -82.26330) The bench mark is a disk in the second set of steps leading to the front entrance of the Placida Post Office, 15.06 m (49.4 ft) west of the centerline of the road, 14.20 m (46.6 ft) north of the NE corner of the Gasparilla Fishery building, 0.67 m (2.2 ft) east of the SE corner of the post office building, and 0.61 m (2.0 ft) above ground level.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8725667 PUBLICATION DATE: 04/27/2012 Name: PLACIDA, GASPARILLA SOUND FL NOAA Chart: 11426 Latitude: 26° 50.0' N ( 26.83330) USGS Quad: PLACIDA Longitude: 82° 15.9' W ( -82.26500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5667 C RESET 1982 DESIGNATION: 872 5667 C TIDAL RESET MONUMENTATION: Tidal Station disk VM#: 7381 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7782 SETTING CLASSIFICATION: Concrete sidewalk OPUS PID: LATITUDE: 26° 50.0' N ( 26.83330) LONGITUDE: 82° 15.8' W ( -82.26330) The bench mark is a disk set in the concrete sidewalk of the County Road 771 bridge over Coral Creek, 31.85 m (104.5 ft) SW of the north corner of the bridge, 4.27 m (14.0 ft) NW of the centerline of the highway and 0.37 m (1.2 ft) SE of the NW bridge rail. BENCH MARK STAMPING: 5667 D DESIGNATION: 872 5667 D TIDAL MONUMENTATION: Survey disk VM#: 17159 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: AG7784 SETTING CLASSIFICATION: Bridge Abutment OPUS PID: LATITUDE: 26° 50.0' N ( 26.83330) LONGITUDE: 82° 15.8' W ( -82.26330) The bench mark is a disk set in the SW abutment located 5.64 m (18.5 ft) SW of the approximate centerline of County Road 771, 2.20 m (6.9 ft) NW of a wooden guard rail, and 0.67 m (2.2 ft) SE of a metal guard rail.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8725667 PUBLICATION DATE: 04/27/2012 Name: PLACIDA, GASPARILLA SOUND FL NOAA Chart: 11426 Latitude: 26° 50.0' N ( 26.83330) USGS Quad: PLACIDA Longitude: 82° 15.9' W ( -82.26500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5667 E DESIGNATION: 872 5667 E TIDAL MONUMENTATION: Survey disk VM#: 17160 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: AG7781 SETTING CLASSIFICATION: Concrete bridge abutment OPUS PID: LATITUDE: 27° 28.0' N ( 27.46592) LONGITUDE: 82° 41.2' W ( -82.68717) The bench mark is a disk set in the bridge abutment located 5.48 m (18.0 ft) NW of the approximate centerline of County Road 771, 0.67 m (2.2 ft) NW of a metal guard rail, and 0.06 m (0.2 ft) NW of the north end of a concrete guard rail.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8725667 PUBLICATION DATE: 04/27/2012 Name: PLACIDA, GASPARILLA SOUND FL NOAA Chart: 11426 Latitude: 26° 50.0' N ( 26.83330) USGS Quad: PLACIDA Longitude: 82° 15.9' W ( -82.26500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: CHA 15 1983 BSM DESIGNATION: CHA 15 MONUMENTATION: Survey disk VM#: 19971 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: AG7780 SETTING CLASSIFICATION: Concrete culvert headwall OPUS PID: LATITUDE: 26° 50.6' N ( 26.84389) LONGITUDE: 82° 15.4' W ( -82.25611) The bench mark is a disk set 0.30 m (1 ft) below the centerline of highway, bearing 14.05 m (46.1 ft) NW of the centerline of the road, 4.72 m (15.5 ft) SW of the NE end of the headwall, 36.21 m (118.8 ft) NNW and across the highway from a power pole, and 2.13 m (7.0 ft) NE of a witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8725667 PUBLICATION DATE: 04/27/2012 Name: PLACIDA, GASPARILLA SOUND FL NOAA Chart: 11426 Latitude: 26° 50.0' N ( 26.83330) USGS Quad: PLACIDA Longitude: 82° 15.9' W ( -82.26500) T I D A L B E N C H M A R K S BENCH MARK STAMPING: CHA 16 1983 BSM DESIGNATION: CHA 16 MONUMENTATION: Survey disk VM#: 19972 AGENCY: Florida Dept. of Environmental Protection (FLDEP) IDB PID#: AG7779 SETTING CLASSIFICATION: Concrete culvert headwall OPUS PID: LATITUDE: 26° 51.1' N ( 26.85250) LONGITUDE: 82° 15.0' W ( -82.24917) The bench mark is a disk set above the level of the centerline of the highway, bearing 12.2 m (40.1 ft) SE of the centerline of the highway, 1.5 m (5 ft) SW of the NE end of the headwall, 13.41 m (44 ft) SW of a power pole, and 2.34 m (7.7 ft) NE of a witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8725667 PUBLICATION DATE: 04/27/2012 Name: PLACIDA, GASPARILLA SOUND FL NOAA Chart: 11426 Latitude: 26° 50.0' N ( 26.83330) USGS Quad: PLACIDA Longitude: 82° 15.9' W ( -82.26500) T I D A L D A T U M S Tidal datums at PLACIDA, GASPARILLA SOUND based on: LENGTH OF SERIES: 5 MONTHS TIME PERIOD: August 1977 - December 1977 TIDAL EPOCH: 1983-2001 CONTROL TIDE STATION: 8725744 PUNTA GORDA Elevations of tidal datums referred to Mean Lower Low Water (MLLW), in METERS: MEAN HIGHER HIGH WATER MHHW = 0.429 North American Vertical Datum NAVD88 = 0.389 MEAN HIGH WATER MHW = 0.358 MEAN SEA LEVEL MSL = 0.239 MEAN TIDE LEVEL MTL = 0.234 MEAN LOW WATER MLW = 0.109 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5667 B 1977 2.735 2.377 5667 A RESET 1982 1.813 1.455 5667 C RESET 1982 3.344 2.986 5667 D 3.004 2.646 5667 E 3.155 2.797 CHA 15 1983 BSM 1.641 1.283 CHA 16 1983 BSM 1.785 1.427 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 marks CHA 15 1983 BSM and CHA 16 1983 BSM 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: 8725667 PUBLICATION DATE: 04/27/2012 Name: PLACIDA, GASPARILLA SOUND FL NOAA Chart: 11426 Latitude: 26° 50.0' N ( 26.83330) USGS Quad: PLACIDA Longitude: 82° 15.9' W ( -82.26500) 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.