Recordings of the March 10 virtual public open houses are now available on our Public Involvement page
The Montana Department of Transportation (MDT) will reconstruct approximately 4 miles of US 287/US 12, east of East Helena. The new road will consist of two travel lanes in each direction, a center turn lane, improved right-turn access from Spokane Creek Road, and eight-foot shoulders throughout the project area. The roadway will be completely reconstructed, including grading, resurfacing, pavement markings, and signage.
US 287/US 12 is an important state highway for traffic between I 15 in Helena and I 90 in Three Forks and for surrounding communities. The road is being constructed to current standards to accommodate increased traffic volumes. The Highway 287 project will provide US 287/US 12 passing and turn lanes for a section of roadway beginning just east of Diehl Ranch Drive and ending just east of Spokane Creek Road. This project is in Lewis & Clark and Jefferson Counties.
Right-of-way has been acquired, and construction will begin in early 2022. Drivers can expect travel delays, gravel road surfaces, and lower speeds during construction.
Project Limits Map
View PDF Highway 287 - Diehl Ranch Dr to Spokane Creek Rd Project Limits Map
How can I stay informed?
Big Sky Public Relations has been hired by MDT to ensure we can answer your questions as quickly as possible and to improve our ability to share information.
Refer to this site for upcoming public involvement notices as they become available. Notices will also be distributed to those on the project's mailing list. MDT encourages members of the public to join the project's mailing list by submitting contact information to Kristine Fife at
Information will be published on this website, in local media venues, and via email updates as the project progresses.