Montana Department of Transportation

Malcolm “Mack” Long, Director

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Active Project - Bonner Bridges Project

Bonner Bridges Project

Project Overview

Bonner Bridges Project image

At the end of 2019, the Montana Department of Transportation (MDT) completed the reconstruction of the Interstate 90 bridges crossing the Blackfoot River. However, the piers at the Bonner Bridges site were not removed due to additional costs that would be incurred. These costs include the maintenance costs for another bridge in the Blackfoot river that would be required if the piers were removed.

Since completing bridge stabilization on the Bonner Bridges in 2019, MDT has continued to seek opportunities and funding to remove the piers.

At this time, as of December 2020, the Montana Department of Transportation is in conversation with numerous stakeholders in order to determine the best possible solution for pier removal moving forward. MDT’s primary factors when considering solutions are safety, efficiency and environmental sensitivity.

The general public and media will be updated as soon as more information is available.

Please call 406-207-4484 or email Becca at with any questions or to sign up for project updates.

Stay in the Know

For email updates about the project, .

Hotline: Call 406-207-4484 during business hours.

Text Alerts: Text BONNERBRIDGES to 41411 for current river closure information during active construction*.

*Msg. and data rates apply. 1 msg/week. Reply STOP to opt-out at any time. Reply HELP for help. Text alerts are only active throughout the duration of Montana Department of Transportation work on Bonner Bridges; alerts will not be sent for closures in any other area of the Blackfoot River or any other waterway in Missoula. Visit our security policy for terms and privacy policy.