U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Datums Page Page 1 of 7 Station ID: 8725837 PUBLICATION DATE: 06/02/2011 Name: MYAKKA RIVER, US 41 FL NOAA Chart: 11426 Latitude: 27° 2.7' N ( 27.04500) USGS Quad: MYAKKA RIVER Longitude: 82° 17.6' W ( -82.29330) To reach the tidal bench marks from the intersection of Venice Avenue and US Highway 41 in Venice, proceed 19 km (12 mi) SE along US Highway 41 to the bridge over the Myakka River. The bench marks are located around the Plamore Resort. The tide gage and staff were located on a small concrete pier behind the bar building of the resort. T I D A L B E N C H M A R K S PRIMARY BENCH MARK STAMPING: 5837 A 1977 DESIGNATION: 872 5837 A MONUMENTATION: Tidal Station disk VM#: 6089 AGENCY: National Ocean Survey (NOS) IDB PID#: AG7854 SETTING CLASSIFICATION: Concrete walkway OPUS PID: LATITUDE: 27° 2.7' N ( 27.04500) LONGITUDE: 82° 17.6' W ( -82.29330) The primary bench mark is a disk set flush in the top of a concrete sidewalk level with the restaurant parking lot, 17.07 m (56.0 ft) WSW of the NW corner of the boat dock, 11.58 m (38.0 ft) SSE of bench mark 5837 B 1977, 11.58 m (38.0 ft) NE of the centerline of the road to the Myakka River Inn, and 1.28 m (4.2 ft) SW of the SW corner of the restuarant building.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 2 of 7 Station ID: 8725837 PUBLICATION DATE: 06/02/2011 Name: MYAKKA RIVER, US 41 FL NOAA Chart: 11426 Latitude: 27° 2.7' N ( 27.04500) USGS Quad: MYAKKA RIVER Longitude: 82° 17.6' W ( -82.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: U 255 RESET 1975 DESIGNATION: U 255 RESET MONUMENTATION: Bench Mark disk VM#: 6088 AGENCY: National Geodetic Survey (NGS) IDB PID#: AG0915 SETTING CLASSIFICATION: Concrete sidewalk OPUS PID: LATITUDE: 27° 2.7' N ( 27.04500) LONGITUDE: 82° 17.6' W ( -82.29330) The bench mark is a disk set flush in the top of a concrete sidewalk level with the restaurant parking lot, located along the north side of apartment #2 at the Myakka River Inn, 35.81 m (117.5 ft) SSE of bench mark BM 2 RESET 1975, 11.28 m (37.0 ft) WSW of the NW corner of the bar building, 2.13 m (7.0 ft) south of the NW corner of the sidewalk, 0.30 m (1.0 ft) west of the NW corner of apartment #2 and 0.21 m (0.7 ft) south of a brick flower box. BENCH MARK STAMPING: BM 3 DESIGNATION: 872 5836 TIDAL 3 MONUMENTATION: Tidal Station disk VM#: 6091 AGENCY: US Coast and Geodetic Survey (USC&GS) IDB PID#: AG1863 SETTING CLASSIFICATION: Concrete sidewalk OPUS PID: LATITUDE: 27° 2.6' N ( 27.04330) LONGITUDE: 82° 17.6' W ( -82.29330) The bench mark is a disk set flush in the sidewalk located at the SE corner of the apartment building, 17.07 m (56.0 ft) west of the water's edge of the river, 14 m (46 ft) east of bench mark U 255 RESET 1975, 0.09 m (0.3 ft) east of the NE corner of the apartment building and 0.09 m (0.3 ft) east of a brick flower box.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 3 of 7 Station ID: 8725837 PUBLICATION DATE: 06/02/2011 Name: MYAKKA RIVER, US 41 FL NOAA Chart: 11426 Latitude: 27° 2.7' N ( 27.04500) USGS Quad: MYAKKA RIVER Longitude: 82° 17.6' W ( -82.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: 5837 C DESIGNATION: 872 5837 C MONUMENTATION: Survey disk VM#: 19920 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: DL9715 SETTING CLASSIFICATION: Concrete bridge rail OPUS PID: LATITUDE: 27° 2.7' N ( 27.04583) LONGITUDE: 82° 17.5' W ( -82.29142) The bench mark is a disk set flush in the top of the SW concrete bridge guardrail and about 0.9 m (3.0 ft) above the level of U.S. Highway 41 Southbound, 6.9 m (22.8 ft) SE of the approximate centerline of U.S. Highway 41 southbound lanes, 2.5 m (8.1 ft) NE of the SW end of a concrete guardrail, and 1.7 m (5.7 ft) NE of a metal guardrail. BENCH MARK STAMPING: 5837 D DESIGNATION: 872 5837 D MONUMENTATION: Survey disk VM#: 19921 AGENCY: Florida Department of Transportation (FLDT) IDB PID#: DL9714 SETTING CLASSIFICATION: Concrete bridge rail OPUS PID: LATITUDE: 27° 2.8' N ( 27.04611) LONGITUDE: 82° 17.5' W ( -82.29097) The bench mark is a disk set flush in the top of the SE concrete bridge guardrail and about 0.9 m (3.0 ft) above the level of U.S. Highway 41 southbound, 10.5 m (34.4 ft) west of a metal light pole numbered 45bc-07, 6.9 m (22.8 ft) SE of the approximate centerline of U.S. Highway 41 south-bound lanes, and 2.4 m (8.0 ft) SW of the NE end of a concrete guardrail.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 4 of 7 Station ID: 8725837 PUBLICATION DATE: 06/02/2011 Name: MYAKKA RIVER, US 41 FL NOAA Chart: 11426 Latitude: 27° 2.7' N ( 27.04500) USGS Quad: MYAKKA RIVER Longitude: 82° 17.6' W ( -82.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: HAVOLINE 2 1974 DESIGNATION: HAVOLINE 2 MONUMENTATION: Horizontal Station disk VM#: 19922 AGENCY: National Geodetic Survey (NGS) IDB PID#: AG1868 SETTING CLASSIFICATION: Concrete monument OPUS PID: LATITUDE: 27° 2.8' N ( 27.04675) LONGITUDE: 82° 15.4' W ( -82.25617) The bench mark is disk set in the top of a concrete monument recessed 0.15 m (0.5 ft) inches below the level of the ground and about 0.15 m (0.5) ft below the level of U.S. Highway 41.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 5 of 7 Station ID: 8725837 PUBLICATION DATE: 06/02/2011 Name: MYAKKA RIVER, US 41 FL NOAA Chart: 11426 Latitude: 27° 2.7' N ( 27.04500) USGS Quad: MYAKKA RIVER Longitude: 82° 17.6' W ( -82.29330) T I D A L B E N C H M A R K S BENCH MARK STAMPING: V 634 2005 DESIGNATION: V 634 MONUMENTATION: Flange-encased Rod VM#: 19923 AGENCY: National Geodetic Survey (NGS) IDB PID#: DJ3119 SETTING CLASSIFICATION: Stainless steel rod OPUS PID: LATITUDE: 27° 2.9' N ( 27.04789) LONGITUDE: 82° 16.5' W ( -82.27564) The bench mark is a stainless steel rod located 10.15 m (33.3 ft) south of the approximate centerline of U.S. Highway 41 northbound, 31.8 ft north of the approximate centerline of U.S. Highway 41 southbound, 3.81 m (12.5 ft) north of a metal guardrail and 0.30 m (1.0 ft) west of a carsonite witness post. The bench mark is a stainless steel rod driven to refusal at a depth of 4.87 m (16.0 ft) with an NGS logo cap recessed 1 inch below the level of the ground and level with U.S. Highway 41, the datum point being recessed 4 inches below the level of the NGS logo cap.
U.S. DEPARTMENT OF COMMERCE National Oceanic and Atmospheric Administration National Ocean Service Page 6 of 7 Station ID: 8725837 PUBLICATION DATE: 06/02/2011 Name: MYAKKA RIVER, US 41 FL NOAA Chart: 11426 Latitude: 27° 2.7' N ( 27.04500) USGS Quad: MYAKKA RIVER Longitude: 82° 17.6' W ( -82.29330) T I D A L D A T U M S Tidal datums at MYAKKA RIVER, US 41 based on: LENGTH OF SERIES: 3 MONTHS TIME PERIOD: October 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 = 0.580 MEAN HIGH WATER MHW = 0.499 North American Vertical Datum NAVD88 = 0.441 MEAN SEA LEVEL MSL = 0.312 MEAN TIDE LEVEL MTL = 0.306 MEAN LOW WATER MLW = 0.112 MEAN LOWER LOW WATER MLLW = 0.000 North American Vertical Datum (NAVD88) Bench Mark Elevation Information In METERS above: Stamping or Designation MLLW MHW 5837 A 1977 1.656 1.157 U 255 RESET 1975 1.581 1.082 BM 3 1.583 1.084 5837 C 5.871 5.372 5837 D 5.363 4.864 HAVOLINE 2 1974 2.434 1.935 V 634 2005 3.767 3.268 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 5837 C, 5837 D, HAVOLINE 2 1974,and V 634 2005 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: 8725837 PUBLICATION DATE: 06/02/2011 Name: MYAKKA RIVER, US 41 FL NOAA Chart: 11426 Latitude: 27° 2.7' N ( 27.04500) USGS Quad: MYAKKA RIVER Longitude: 82° 17.6' W ( -82.29330) 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.