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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.

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Downloads and resources

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.

Construction is expected to begin as early as 2023 and could take two seasons.

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

This project was developed with input from the community, with an open house held in 2019, a survey deployed in 2020 and stakeholder meetings held throughout design.

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
2023 - 2024
Construction

Downloads & Resources

Renderings
Regional viewExisting conditionsProposed conditions
Project Fact Sheet
September 2020 fact sheet
Open House - June 2019
Displays
Feasibility Study
2018 Final Report
Public Documents - Environmental
Approved categorical exclusion Biological assessment Biological opinion Finding of adverse effect Navigation impact report USFWS LOC Nationwide permit Adverse effect MOA
1
October 2020

Joint repairs

Joint repairs to the westbound lanes were completed.

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July 2020

Survey on construction impacts

ITD surveyed stakeholders about possible impacts during construction.

survey
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.

2019

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.

Project
Updates

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

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US-12, Clearwater Memorial Bridge

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