US 12/18 and County W/Oak Park Road intersection, Deerfield - Dane County

Project location | Project overview | Schedule | Traffic impacts/detours | Status/phase | Contact information

Project location

US 12/18 and County W/Oak Park​ Road intersection, Deerfield - Dane County

​​Project overview

WisDOT is in the process of developing plans to reconstruct the intersection of US 12/18 at County W/Oak Park Road near Deerfield to improve safety and mobility. WisDOT is considering and analyzing three improvement alternatives.

  • Construct a single lane roundabout
  • Construct a signalized intersection
  • Construct left turn lanes



  • 2026 - Construction anticipated

Traffic impacts/detours

US 12/18 will be constructed in stages and remain open to through traffic.

County W and Oak Park Road will be closed or restricted to right-in and right-out during construction.



Contact information

Steven Porter, P.E.
WisDOT Project Manager
(608) 243-3366

Michael Bie
WisDOT Southwest Region Communications Manager
(608) 246-7928

Wisconsin Department of Transportation (WisDOT)
Southwest Region, Madison Office
2101 Wright Street
Madison, WI 53704
Phone: (608) 246-3800
Fax: (608) 246-3843
TTY: 711