The Montana Department of Transportation (MDT) plans to construct a new bridge spanning the Big Hole River 22 miles north of Dillon on US Highway 91 (US 91), as part of the Kalsta Bridge at Glen project. The Big Hole River Bridge is a one-span riveted steel Pratt through truss structure. It was built in 1928 and has been closed since 2024.

Anyone interested in adopting and relocating the Big Hole River Bridge would be required to obtain the necessary federal, state, and local permits and easements, provide MDT with a plan outlining how the bridge would be moved, and state the intended use of the structure. Interested parties must submit initial screening materials on or before November 16, 2025.

The bridge is eligible for listing in the National Register of Historic Places. Additional information about this process can be found at mdt.mt.gov/business/bridge-adoption-details.aspx.

For more information, please contact MDT Historian Jon Axline at 406-444-6258.