Big Cottonwood Canyon wildfire mitigation project

Rocky Mountain Power began construction in Big Cottonwood Canyon (SR-190) in May 2022 to improve overhead power lines to mitigate wildfire threats.

This project is replacing segments of overhead power lines along SR-190 with underground conduit and upgrading existing overhead systems to withstand weather and environmental conditions to help prevent wildfires, protect communities and provide safe, reliable power. 

Construction is underway, although schedules are weather-dependent and subject to change. The project completion is anticipated in fall 2023.

Construction Updates

Crews are currently working between milepost (MP) 6 and MP 7 (Elbow Fork)

  •  Expect a one-mile-long single-lane closure in this area

Crews will work Monday through Friday from 7 a.m. to 7 p.m., with minimal night and weekend work. Single lane closures will be in place 24 hours a day, seven days a week, except for holiday weekends. To mitigate congestion in the canyon on weekends, the alternating signals will be remotely monitored and adjusted between 7 a.m. on Saturday and 10 p.m. on Sunday. Remote monitoring will also be in place for special events.

As part of the project construction, 8-inch-wide trenches have been dug along the roadway. Due to safety requirements, the trenches must be filled and paved before vehicles are allowed to travel on these sections of the roadway. Because of concrete and other materials shortages, the timeline for the trenches being filled depends upon the availability of these materials. Construction equipment must also be stored on-site, requiring the traffic signal always remain in place. 

What to expect

  • One-way, alternating traffic controlled by an alternating signal 24 hours a day, seven days a week. All traffic, including bicyclists, are required to obey flagging operations.
  • Remote signal monitoring on weekends and during special events to mitigate congestion.
  • 15 minute delays are typical but may be significantly longer on busier days. Delay times are based on traffic volume and demand in the canyon, so plan for events in the canyon. For the latest information on traffic patterns and restrictions during construction, visit the UDOT Traffic website or download the UDOT Traffic app for iPhone or Android.  
  • Restricted access to trailheads and picnic areas in construction areas.
  • Potential noise, dust and vibration along the roadway

Overview map


Call 1-385-446-6800 or email us.