The Montana Department of Transportation (MDT), in cooperation with Missoula County, is proposing to construct a new crossing over the Bitterroot River west of Missoula. The project would enhance safety for the traveling public by constructing a new bridge structure and associated roadway approaches that meet current design standards and future traffic demands. The Bitterroot River Bridge, Missoula, project would construct a new two-lane bridge (one travel lane in each direction) over the Bitterroot River on an extension of South Avenue and remove the Maclay Bridge on North Avenue.
The project is in the design phase. Construction is tentatively planned for 2026 and is subject to change dependent on available funding and completion of all project development activities.
HDR is the local engineering firm originally hired by Missoula County and retained by MDT to provide the project design, environmental documentation, and public outreach. HDR has included Tetra Tech and DJ&A on the design team to provide geotechnical design and surveying, respectively.