Project Overview
The Montana Department of Transportation (MDT), in partnership with CK May Excavating, Inc., is planning pavement improvements on almost 9 miles of U.S. Highway 20 (US 20) west of West Yellowstone.
This pavement preservation project will extend the life of the roadway and improve driving conditions. Most of the corridor will receive a seal and cover (chip seal) treatment, which places a protective layer over the existing pavement to help prevent cracking and deterioration caused by weather and traffic.
Additional improvements will be made at several locations along the project corridor, as follows:
- Between mile markers 0 and 1.2, crews will mill and overlay the roadway, removing the top layer of pavement and replacing it with new asphalt to create a smoother surface.
- Near mile marker 3.5, MDT will replace a failing double culvert at Buttermilk Creek to improve drainage and protect the roadway.
- Between mile markers 4.53 and 4.62, crews will complete a full-width roadway dig out, where damaged pavement and underlying materials will be removed and rebuilt to strengthen the road foundation.
Together, all improvements will enhance safety, improve driving conditions, and extend the life of this section of US 20 while reducing long-term maintenance costs.
Construction is expected to begin Summer 2026 and be completed in a single season.
What to Expect during Construction
During construction, travelers may experience:
- Temporary lane closures
- Reduced speeds through project work zones
- Short delays during paving operations
MDT will work to keep traffic moving safely and to minimize impacts to travelers when possible. Please drive cautiously, follow posted speed limits, and watch for crews and equipment near the roadway.
Stay Informed, Get Involved
During construction, MDT will provide updates to the public through these project webpages, local media, social media, and email and text notifications. See the sidebar to sign up for construction updates.
To provide a comment, use our online comment form.
UPN 10262000