March 2026
The Montana Department of Transportation (MDT) and its partners, Sletten Construction and Morrison-Maierle, are continuing preparations for the start of construction on the Lewistown Area Bridges-DAR Structures project.
This project involves replacing 11 timber bridges in the Lewistown area, which have been divided into two construction packages. The first package is scheduled for replacement in 2026 and 2027, and the second package in 2027 and 2028.
Work on the first package of bridge replacements is expected to begin in early summer and will include:
- Dry Wolf Creek Bridge on Montana Highway 81 (MT 81), 6 miles southeast of Denton
- Drainage Bridge on MT 81, 6 miles west of Brooks
- Drainage Bridge on MT 81, 5 miles west of Brooks
- Drainage Bridge on MT 81, 4 miles west of Brooks
- Deadman’s Basin Canal Bridge on Secondary Highway 297 (S 297), 1 mile north of Shawmut
During construction, detours will be directly next to the current structures, and minimal traffic disruptions are anticipated. Traffic control will be on-site, speed limits will be reduced, and shoulder closures will be in place through the construction zones.
A motorcycle advisory will be in effect due to the gravel surfaces on the detours, which can create hazardous riding conditions. Motorcyclists are strongly encouraged to consider using an alternate route.
When work begins, watch for crews working along the highway. They operate just feet from passing vehicles and rely on drivers to stay alert, slow down, and use extra caution to help keep everyone safe.
More information regarding construction start dates, the order of bridge replacements, and what travelers can expect during construction will be provided soon.
Regular email and project webpage updates will be available during construction. Text message updates will also be provided. To receive text message* updates, text LEWISTOWNDAR to 41411.
If you have questions or concerns, please don’t hesitate to reach out by emailing Sloane at