Project Info

US 12 - Rimrock Lake Vicinity - Slope Stabilization


Fall 2017

  • Construction and detour map (pdf 244 kb)
  • Starting Monday, Sept. 18, US 12 will be closed to thru-traffic 24/7 just west of the Rimrock Tunnel. A 30-minute detour along Tieton Reservoir Road will allow thru-traffic to drive safely around the work zone while rock-scaling crews remove unstable rocks above the slopes.
  • All businesses, homes and recreational areas will remain accessible through the duration of the project. The detour is scenic and slower with narrow lanes. Please obey all posted speed limits and be aware of wildlife and livestock.

Why is WSDOT stabilizing the slopes above Rimrock Lake?
In the fall of 2017, crews will close a section of US 12 west of the Rimrock tunnel while crews remove loose rock above the hillside. After Labor Day, traffic will be detoured around the Tieton-Reservoir Road. Drivers can expect up to 20-minutes of added travel time.
Businesses, residents and recreational areas along US 12 will remain accessible through the detour at all times. Crews will complete work by the end of October 2017

The End Result
WSDOT will remove loose rocks, timber and debris above US 12.

Project Benefits
Safety: Removing unstable rocks will reduce the potential for future slides.

Mobility: This project will reduce the possibility of emergency closures and traffic delays due to rock slides.

What is the project timeline?

  • September 2017: Project begins
  • October 2017: Estimated project completion


How can I get more information?

Summer Derrey
WSDOT Communications