WIS 78 (County DL to Arco Drive), Sauk City to I-39

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

Project location

WIS 78 (County DL to Arco Drive), Sauk City to I-39, Columbia County

Project overview

The Wisconsin Department of Transportation (WisDOT) has developed plans for a resurfacing project on WIS 78 in Columbia County. The 7.6 mile project is located between the County DL intersection and the Arco Drive intersection in the Town of Caledonia.

Improvements include:
  • Adding either 3.5-inch or 1.75-inch Hot Mix Asphalt (HMA) to surface layer
  • Replacement of existing guardrail
  • Replacement of existing pavement markings


  • Summer 2020 - Construction anticipated

Traffic impacts/detours

WIS 78 will be closed to through traffic with a posted detour.



Contact information

Mahesh Shrestha, WisDOT Project Manager
(608) 245-2674

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
Email: swr.dtsd@dot.wi.gov