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° , Dane County Land & Water Resources Department Administration • Land Conservation • Office of Lakes&Watersheds• Parks •• Water Resource Engineering Kevin F.Connors,Director June 27, 2016 Dane County Planning and Development Room 116 City-County Building Madison, WI 53703 Floodplain Development Permit Halfway Prairie Creek Snowmobile Bridge Town of Mazomanie, Section 9 The proposed snowmobile bridge will cross Halfway Prairie Creek on private property through an easement provided to Dane County. It will replace an existing wood flat span bridge that has become structurally unsafe. The plan conforms to Dane County Code of Ordinance, Chapter 17, Floodplain Regulations. The new snowmobile bridge will have a low chord of the bridge at approximately 886'. The cross section of the proposed bridge is a 49% increase compared to the existing wooden bridge. We expect no adverse impact to the regional floodplain. The following conditions were considered in the design: • This development shall not obstruct flow, defined as development which blocks the conveyance of floodwaters by itself or with other development, causing any increase in the regional flood height; or cause any increase in the regional flood height due to floodplain storage area lost. • Bridge shall be designed and constructed to have a low flood damage potential. • Adequate flood proofing measures shall be provided to the flood protection elevation. The attached map provides a site location of the bridge, including contour elevations. Dane County Water Resource Engineering has reviewed this plan and are providing their approval. cerel /y/ 1.)/ Jere► :, . _ -k Di ision Manager Water Resource Engineering Division Lyman F.Anderson Agriculture Est Conservation Center 5201 Fen Oak Drive,Room 208,Madison,Wisconsin 53718-PH:608/224-3730,FAX:608/224-3745 www.countyof dane.c o m/lwrd