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NSA Memo • ERIK C. •• -fl E-37= 1 W PROFESSIONAL SERVICES' • ,+ M • i•'I s•• e4 • • •♦ 1 • / ft• To: Hans Hilbert, Dane County Assistant Zoning Administrator . * • • ,.// From: Erik Sorensen, PE, MSA Professional Services \ Subject: Stagecoach Road Reconstruction—Floodplain Zoning Date: May 19, 2017 This memorandum and supporting documentation are submitted in support of a Floodplain Development Application to Dane County Zoning Division. The Stagecoach Road Reconstruction project is located within the Town of Cross Plains between County Highway P and US Highway 14. The reconstruction consists of removal and reconstruction of approximately 1.5 miles (8,000 linear feet)of roadway. The project location and floodplain limits are shown on the attached DCI Map excerpt. The project location is also shown on Sheet G1 of the attached project plans. The purpose of this project is to reconstruct a deteriorating roadway which was not constructed to withstand the heavy truck traffic it receives;and to improve safety. The road is also a preferred route for bicyclists,creating a need for additional lane width. The typical roadway section will be widened from two 11-ft travel lanes with 2-ft shoulders to two 11-foot travel lanes with 5-foot paved shoulders and 1-foot gravel shoulders. The project will also include ditch restoration and replacement of CMP culverts where necessary. Five (5) cross culverts exist within the project limits, two of which are located at crossings over navigable streams with associated mapped floodplain (Sta. 23+75 and Sta. 76+75). The culvert at Sta. 76+75 carries the Black Earth Creek, and this culvert will not be replaced. Further, the roadway profile elevations at this location will be reconstructed at or below the existing roadway profile elevations. Therefore, there will be no floodplain or floodway impacts at the location of the Black Earth Creek Crossing. The culvert at Sta. 23+75 carries an intermittent unnamed tributary to Black Earth Creek and has Zone A floodplain mapped along the southern (upstream) side of Stagecoach Road. This intermittent stream is a dry run with no defined bed and bank, providing conveyance beneath the roadway between a wetland area to the north and farmed cropland to the south. The low lying areas south of the road are actually drained via two culverts (the other located at Sta. 51+13), which together serve an interconnected watershed totaling approximately 760 acres 2901 International Lane,Suite 300,Madison,WI 53704-3133 (608)242-7779 (800)446-0679 FAX: (608)242-5664 WEB ADDRESS: www.msa-ps.com Page 1 of 2 8913001_floodplainyermit_memo