April 2, 2026

As part of the Clark Fork River/Old Hwy 10 Bridges project, the Montana Department of Transportation (MDT), along with construction partner Sletten Construction Companies, will begin work to replace the westbound bridge that carries Interstate 90 (I-90) over the Clark Fork River, approximately 9.5 miles west of Alberton, this spring. Construction is anticipated to take two years, with completion anticipated in fall 2027.

This year, work will also include painting the bridge that carries I-90 over Old Highway 10 and Elizabeth Lane.

All construction activities are dependent on weather and other unforeseen factors.

Travelers should expect single lane traffic, reduced speed limits, and width and length restrictions may be in place. Follow all posted signage and watch for workers. For the most up-to-date information, visit 511mt.net.

During construction, Old Highway 10 West will be closed to the public between the Tarkio East Fishing Access and the Triple Bridges – Alberton Gorge Recreational Access point, restricting access to the east bank of the Clark Fork River. This section of the Clark Fork River will remain open for recreational use during the 2026 construction season. The public is not permitted to enter the recreational area closure at any point to access the Clark Fork River. At this time, Tarkio East Fishing Access Road will remain open to the public.