U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8725899 PUBLICATION DATE: 06/02/2011 Name: NOKOMIS, VENICE INLET FL NOAA Chart: 11424 Latitude: 27° 7.4' N ( 27.12330) USGS Quad: VENICE Longitude: 82° 28.2' W ( -82.47000) To reach the tidal bench marks from the intersection of State Road 789 (Albee Road) and U.S. Highway 41 east of Nokomis, proceed 1.9 km (1.2 mi) west on State Road 789 to the U.S. Coast Guard Station in Nokomis. The bench marks are at the Coast Guard Station and along State Road 789. The tide gage and staff were on the SE corner of the bulkhead of the Coast Guard Station. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5899 B 1989 DESIGNATION: 872 5899 B MONUMENTATION: Tidal Station disk VM#: 6093 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: DL2734 SETTING CLASSIFICATION: Concrete bridge railing OPUS PID: LATITUDE: 27° 7.4' N ( 27.12330) LONGITUDE: 82° 28.2' W ( -82.47000) The primary bench mark is a disk set flush in the top of a concrete guardrail and about 1.1 m (3.5 ft) above the level of Albee Road (State Road 789), 39.7 m (130.2 ft) west of the approximate center of the draw span, 5.8 m (19.0 ft) east of a warning signal box, 5.6 m (18.4 ft) south of the approximate centerline of Albee Road (State Road 789), and 0.9 m (3.0 ft) above the level of a concrete walkway.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8725899 PUBLICATION DATE: 06/02/2011 Name: NOKOMIS, VENICE INLET FL NOAA Chart: 11424 Latitude: 27° 7.4' N ( 27.12330) USGS Quad: VENICE Longitude: 82° 28.2' W ( -82.47000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5899 A 1989 DESIGNATION: 872 5899 A MONUMENTATION: Tidal Station disk VM#: 6092 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: DL9718 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 27° 7.4' N ( 27.12330) LONGITUDE: 82° 28.2' W ( -82.47000) The bench mark is a disk located 15.1 m (49.5 ft) south of the approximate centerline of a Sarasota County Park Driveway, 8.4 m (27.6 ft) east of the approximate centerline of Casey Key Road, 2.2 m (7.2 ft) north of a carsonite 'witness post and 0.9 m (3.0 ft) east of a chain link fence. The bench mark is crimped to the top of a stainless steel rod driven to refusal at a depth of 7.0 m (23.0 ft) with a PVC pipe flush with the ground and level with Casey Key Road, and recessed 0.04 m (0.1 ft) below the level of the PVC pipe. BENCH MARK STAMPING: 5899 C 1989 DESIGNATION: 872 5899 C MONUMENTATION: Tidal Station disk VM#: 6094 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: DL9721 SETTING CLASSIFICATION: Concrete bridge railing OPUS PID: LATITUDE: 27° 7.5' N ( 27.12572) LONGITUDE: 82° 27.7' W ( -82.46189) The bench mark is a disk set flush in the top of a concrete guardrail and about 0.9 m (3.0 ft) above the level of Albee Road (State Road 789), 6.4 m (21.0 ft) SW of the approximate centerline of Albee Road (State Road 789), 0.4 m (1.3 ft) NW of the SE end of a concrete guardrail, 0.2 m (0.6 ft) SW of a metal 'handrail, and 0.9 m (3.0 ft) above the level of a concrete sidewalk.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8725899 PUBLICATION DATE: 06/02/2011 Name: NOKOMIS, VENICE INLET FL NOAA Chart: 11424 Latitude: 27° 7.4' N ( 27.12330) USGS Quad: VENICE Longitude: 82° 28.2' W ( -82.47000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 17 84 B 15 R111 MONUMENTATION: Survey disk VM#: 6096 AGENCY: Florida Department of Natural Resources (FLDNR) IDB PID#: SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 27° 7.4' N ( 27.12330) LONGITUDE: 82° 28.2' W ( -82.47000) The bench mark is a disk set in the top of a concrete monument in a public park, 36.18 m (118.7 ft) north of the centerline of the entrance to the Coast Guard Station, 8.50 m (27.9 ft) east of Casey Key Road, and 1.49 m (4.9 ft) east of a witness post,and at ground level. BENCH MARK STAMPING: 5899 E DESIGNATION: 872 5899 E MONUMENTATION: Survey disk VM#: 19928 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: SETTING CLASSIFICATION: lConcrete bridge guardrail OPUS PID: LATITUDE: 27° 7.5' N ( 27.12456) LONGITUDE: 82° 28.1' W ( -82.46864) The bench mark is a disk set flush in the top of a concrete guardrail and about 0.9 m (3.0 ft) above the level of Albee Road (State Road 789), 18.5 ft (5.6 m) north of the approximate centerline of Albee Road (State Road 789), 2.4 m (7.9 ft) west of the east end of a concrete guardrail, 2.4 m (7.8 ft) west of a metal guardrail, 1.4 m (4.5 ft) north of the north face of a concrete curb, 0.9 m (3.0 ft) ft above the level of a concrete walkway, and 0.4 m (1.4 ft) SE of a warning signal box.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8725899 PUBLICATION DATE: 06/02/2011 Name: NOKOMIS, VENICE INLET FL NOAA Chart: 11424 Latitude: 27° 7.4' N ( 27.12330) USGS Quad: VENICE Longitude: 82° 28.2' W ( -82.47000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: W 699 2007 DESIGNATION: W 699 MONUMENTATION: Flange-encased Rod VM#: 19929 AGENCY: National Geodetic Survey (NGS) IDB PID#: DL2733 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 27° 7.5' N ( 27.12481) LONGITUDE: 82° 27.3' W ( -82.45436) The bench mark is a stainless steel rod located 6.9 m (22.7 ft) east of the west end of the center median, 5.9 m (19.2 ft)north of the approximate centerline of Albee Road eastbound lanes, 4.8 m (15.6 ft) south of the approximate centerline of Albee Road westbound lanes and 0.4 m (1.4 ft) east of a carsonite witness post. The bench mark is a stainless steel rod driven to refusal at a depth of 5.6 m (18.3 ft) with an NGS logo cap flush with the ground and about 0.2 m (0.8 ft) above the level of Albee Road, the datum point being recessed 0.03 m (0.1 ft) below the level of the NGS logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8725899 PUBLICATION DATE: 06/02/2011 Name: NOKOMIS, VENICE INLET FL NOAA Chart: 11424 Latitude: 27° 7.4' N ( 27.12330) USGS Quad: VENICE Longitude: 82° 28.2' W ( -82.47000) T I D A L B E N C H M A R K S BENCH MARK STAMPING: J 634 2005 DESIGNATION: J 634 MONUMENTATION: Survey disk VM#: 19930 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: DJ3109 SETTING CLASSIFICATION: Round concrete monument OPUS PID: LATITUDE: 27° 7.8' N ( 27.13081) LONGITUDE: 82° 27.2' W ( -82.45325) The bench mark is a disk set in the top of a round concrete monument flush with the ground and level with Spencer Avenue, 30.88 m (101.3 ft) east of the approximate centerline of U.S. Highway 41 northbound, 8.47 m (27.8 ft) north of the approximate centerline of Spencer Avenue, 7.71 m (25.3 ft) east of a chain link fence corner post, 1.22 m (4.0 ft) south of a chain link fence, and 1.16 m (3.8 ft) south of a carsonite witness post.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8725899 PUBLICATION DATE: 06/02/2011 Name: NOKOMIS, VENICE INLET FL NOAA Chart: 11424 Latitude: 27° 7.4' N ( 27.12330) USGS Quad: VENICE Longitude: 82° 28.2' W ( -82.47000) T I D A L D A T U M S Tidal datums at NOKOMIS, VENICE INLET based on: LENGTH OF SERIES: 1 MONTH TIME PERIOD: June 1989 - July 1989 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 = 0.534 North American Vertical Datum NAVD88 = 0.502 MEAN HIGH WATER MHW = 0.473 MEAN SEA LEVEL MSL = 0.278 MEAN TIDE LEVEL MTL = 0.274 MEAN LOW WATER MLW = 0.075 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5899 B 1989 5.685 5.213 5899 A 1989 1.795 1.322 5899 C 1989 4.225 3.752 17 84 B 15 R111 2.070 1.597 5899 E 4.851 4.379 W 699 2007 3.656 3.183 J 634 2005 3.730 3.257 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 5899 E, J 634 2005, and W 699 2007 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: 8725899 PUBLICATION DATE: 06/02/2011 Name: NOKOMIS, VENICE INLET FL NOAA Chart: 11424 Latitude: 27° 7.4' N ( 27.12330) USGS Quad: VENICE Longitude: 82° 28.2' W ( -82.47000) 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.