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US-12, Clearwater Memorial Bridge Improvements

The Idaho Transportation Department will rehabilitate and retrofit the bridge to improve safety, functionality and economic opportunity in the region.

Constructed in 1951, some components of the Clearwater Memorial Bridge are nearing the end of their service life.

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What this project includes

A 2018 feasibility study recommended replacement of the roadway deck using the existing piers. The new bridge deck is expected to include the same number of lanes on US-12 but provide wider shoulders and sidewalks.

ITD will complete a preliminary analysis in 2019 to guide the design of the improved bridge. The analysis includes geotechnical and hydraulic evaluations. Geotechnical work will determine the load-bearing capacity and the settlement potential of the rock below the bridge footings.  Examinations of the hydraulics around the bridge will allow ITD to determine the impacts the river has had, and can potentially have in the future, on the piers and foundations.

Design plans are expected to be completed in 2020, and construction is expected to begin as early as 2024.

Community input

ITD understands that timely communication and public input will play an important role in this project.  ITD will consult with federal and state agencies and will host an open house later in the summer of 2019.  Please watch for updates and invitations to comment.

Spring 2019
Environmental analysis • Community involvement
Asset 5
Summer 2019
Preliminary design • Public open house
Asset 5
Spring 2020
Final design
Asset 5
Asset 5
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