Why does the Kalsta Bridge at Glen need to be replaced?

The Kalsta Bridge at Glen was originally built in 1928 and is in need of replacement. The bridge crosses over the Big Hole River three miles north of Glen on Montana Highway 91 (MT 91) near Interstate 15 (I 15) Exit 85. Inspections found that structural deficiencies can no longer safely accommodate traffic, and in 2024 it was closed to traffic. The Montana Department of Transportation (MDT) will replace the bridge with a new two-lane bridge to enhance safety and improve traffic flow.

When will the bridge be replaced?

Bridge construction is tentatively scheduled for 2028 based on completion of design, right-of-way, and funding availability. This project is in the design and right-of-way phases.

What other factors are considered during the design of the Kalsta Bridge replacement?

MDT considers many factors throughout the design phase, including engineering, environmental impacts, and cost analysis of the project design. MDT prioritizes public safety, efficient traffic flow, cost-effective use of taxpayer funds, and stakeholder feedback in the design. Initial plans for a new Kalsta Bridge include widening the bridge to 28 feet, providing two lanes of traffic, and allowing access under the bridge for recreational use of the river. Stakeholders are encouraged to provide input on bridge design and other considerations throughout the process.

How can you provide comments or find more information on this project?

The public and local stakeholders will be kept informed during the design and construction phases of the project. As with all road and bridge construction projects, MDT is committed to and encourages public involvement. Updates will be posted and on the project's webpage at www.mdt.mt.gov/pubinvolve/kalstabridge/.