Highway 21 construction begins Monday in Winnebago County

The Wisconsin Department of Transportation (WisDOT) Northeast Region reminds motorists that construction begins Monday, April 6, 2026, to improve 8.8 miles of WIS 21 from the south edge of Fox River Bridge in city of Omro to just west of Washburn Street in city of Oshkosh in Winnebago County, Wisconsin. WIS 21 will be closed and detoured during construction beginning on Monday, April 6 to early November 2026.

Traffic impacts

• WIS 21 between the south side of Fox River Bridge in Omro (Adams Avenue) to just west of Washburn Street in Oshkosh will be closed to traffic for the entire project
  • The posted detour will follow WIS 116 to US 45 to I-41

• Access to properties and businesses within the work zone will be always maintained
• Construction of the Sand Pit Road and County FF roundabouts will be staged to not occur at the same time

Project improvements

This is a resurfacing-level project. Project improvements include:

• Concrete pavement repair and asphalt overlay from Fox River Bridge to east city of Omro limits and from Leonard Point Road to just west of Washburn Street
• Concrete pavement repair only from east city of Omro limits to just west of Leonard Point Road
• Upgrading curb ramps within City of Omro for ADA compliance
• Multi-lane roundabout at the Leonard Point Road intersection
• Single-lane roundabouts at the County FF/Reighmoor Road and Sand Pit Road intersections
• Slotted left-turn lanes at the Oakwood Road and Westhaven Drive intersections
• Replacing beam guard along corridor
• New pavement marking throughout corridor

Project benefits

This project will include significant safety improvements with new roundabouts at the WIS 21 intersections with Leonard Point Road, Sand Pit Road, and County FF/Reighmoor Road. It will also include slotted left-turn lanes at the WIS 21 intersections with Oakwood Road and Westhaven Drive. The remainder of project will include pavement repair and resurfacing along with new pavement marking to improve overall ride quality and safety.

For more information

Please see project information, maps, exhibits, and displays online to learn more about this project.

• WIS 21 Project website: https://projects.511wi.gov/21winn2025/full-project-overview/
• This project will appear on the Northeast Region Weekly Highway Construction Update at  https://projects.511wi.gov/weeklyupdates-ne/
• WisDOT Northeast Region Twitter @WisDOTnortheast.