Laserfiche WebLink
Dane <br /> County <br /> Parks &Water Resources Department <br /> Chris James,Senior Landscape Architect <br /> June 1,2016 <br /> Weisensel Clear Span Bridge <br /> Dane County Parks is planning to install a pedestrian/snowmobile bridge across an unnamed tributary of <br /> the Koshkonong Creek at Lat/Lon: 43.121609, -89.193657. The project site is located on public lands in <br /> McCarthy Youth and Conservation County Park near County Hwy TT and County Hwy N in the <br /> Township of Sun Prairie and will connect future pedestrian/snowmobile trails within the park. The project <br /> will include the addition of a 12' wide x 50' long steel and wood arched clear span bridge. This bridge <br /> will be built according to the attached bridge plans and is similar to other bridges permitted by the WDNR <br /> within Dane County Parks. There will be minor bank scarification and no more than 3.5 cubic yards of <br /> material will be removed, if required,to accommodate the placement of the galvanized floating pan <br /> footings. Excavations on each side of the bank will not exceed 1'-0" in depth,fabric will be installed and <br /> 3/4"compacted limestone rock placed on top to provide a pad for the support pans. The floating clear span <br /> bridge will be anchored in place with galvanized, schedule 40 pipe. <br /> The bridge will meet water navigation guidelines of 5'-0"above the Ordinary High Water Mark, and be <br /> designed and engineered for minimal environmental impacts. Steel plate approaches will be implemented <br /> if the bridge height requires approaches greater than the maximum 1'-0" in depth. Erosion control will <br /> include the placement of an urban/net free erosion mat in the disturbed areas to ensure proper restoration, <br /> and seeding and mulching all disturbed areas prior to forecasted rain events.A 12"silt sock will be placed <br /> on the downside slope on both sides of the river to keep debris from entering the river.No alterations or <br /> disturbances will be made to the water or bed of the unnamed tributary. <br /> The selected bridge location is within a drainage district and has received deposits of dredge material over <br /> many years that has created an upland artificial berm on both sides of the channel. This location was <br /> chosen to avoid surrounding wetlands and maximize clearance above the water. <br /> Lyman F.Anderson Agriculture&Conservation Center <br /> 5201 Fen Oak Court,Room 234,Madison,Wisconsin 53718-8812-Phone:608/246-3896,FAX:608/246-3898 <br /> www.countyofdane.com/lwrd/parks <br />