skip to main content
Idaho Official Government Website Contact Us

US-12: Clearwater Memorial Bridge

The Idaho Transportation Department is making plans to 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.

Read More

What this project includes

The new bridge deck will include the same number of lanes on US-12 but provide wider shoulders and sidewalks as well as a painted median. As a result of a feasibility study in 2018, ITD will replace the deck using the existing piers.

ITD is completing an environmental analysis to guide the design of the improved bridge.

Final design plans are expected to be completed in 2021, and construction is expected to begin as early as 2023.

fact sheet
After construction the bridge will be wider and able to support more traffic, cyclists and pedestrians Rendering of existing conditions on the bridge Rendering of proposed conditions on the bridge

Community input

Community input is extremely important to ITD’s design process. During the summer of 2020, ITD collected community input in Lewiston. More than 330 community members participated. ITD would like to thank everyone for their input. ITD has reviewed all input and will incorporate it into final design and construction plans.

A cloudy morning looking at the Clearwater River from the top of the Lewiston grade
Spring 2019
Project begins
Summer 2019
Public open house
Summer 2020
Community input
Fall 2020
Environmental document
Winter 2020
Preliminary design
Fall 2021
Final design
October 2020

Joint repairs

Joint repairs to the westbound lanes were completed.

Read more
July 2020

Survey on construction impacts

ITD surveyed stakeholders about possible impacts during construction.

June 2019

Open house

ITD held a public open house to gather input about the project.

May - June 2019

Riverbed testing

Crews drilled into the southeast corner of the bridge in June 2019 to examine soil quality. From a barge near the bridge, crews analyzed the riverbed to help determine the best way to increase the bridge’s weight capacity.


Preliminary analysis

The preliminary analysis included geotechnical and hydraulic evaluations. Geotechnical work determined the load-bearing capacity and the settlement potential of the rock below the bridge footings.  Examinations of the hydraulics around the bridge showed the impacts the river has had, and can potentially have in the future, on the piers and foundations.


In October 2021, crews will replace the failing joints in the eastbound lanes. Read more.

© Copyright 2022 Idaho Transportation Department Visit ITD Website

US-12, Clearwater Memorial Bridge

Default Project Comment Form
Maximum upload size: 8MB
Maximum upload size: 52.43MB

Signup Form