MADISON, WI – The westbound lanes of US 12/18 entering the I-39/90 interchange will be closed from 7 p.m. tonight (Sept. 30) to 6 a.m. Tuesday (Oct. 1). Westbound US 12/18 traffic will be detoured north on the Interstate to WIS 30 (Exit 138B) and south on US 51/Stoughton Road. The northbound I-39/90 ramp to westbound US 12/18 and the westbound US 12/18 ramp to I-39/90 southbound will also be closed during the nightly closures. The signed detour will follow WIS 30 and US 51.

This construction work and closures are weather dependent and subject to change. If this work is postponed, the operations will occur on Sunday night (Sept. 29) during the same timeframes.

Weekly updates about the Beltline work between Seminole Highway and I-39/90 can be found at under the “Traffic Impacts” tab.

For more information regarding traffic impacts, transportation news and improvement project updates in Wisconsin’s southwest region:

  • Travel information on Wisconsin highways, including Beltline traffic cameras, can be found at
  • Follow us on Twitter: @WisDOTsouthwest for regional alerts from the Traffic Incident Alert System, construction project updates and more.
  • Visit the Southwest Region’s 511 website:

Alerts and updates provided via these sites are not intended for use while driving. When driving, your focus should always be on the road.

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