skip to main content
Idaho Official Government Website Contact Us
I-90 Washington State Line to Coeur d’Alene

With traffic conditions congested now and volumes expected to double by 2045, ITD is studying I-90 from Washington state line to Coeur d’Alene to identify improvements to modernize the system, reduce crashes and save drivers' time.

The study will evaluate needs and identify potential solutions like additional lanes and reconfigured interchanges to improve safety, capacity and mobility for current and future travel demands.

Read More

Project Overview

Congestion causes delays and increases the risk for crashes, especially rear-end crashes. Traffic volumes on I-90 are growing along with the population, and updates to I-90 are needed to keep up with traffic demands.

This study will identify several potential future projects, including additional lanes, improved on- and off-ramps, and reconfigured interchanges, including the I-90 and US-95 interchange. The projects will then be prioritized and advanced into design and construction as funding becomes available. Funding for construction of the entire corridor has not been identified. A previously funded project to redesign the SH-41 interchange is scheduled to start construction in summer 2022.

SH-41 interchange

Safety benefits

Widening the interstate will allow for better flow of traffic, eliminating stop-and-go conditions that result in rear-end crashes. With more lanes available, drivers wouldn’t need to make last-minute, unpredictable lane changes to jockey for better positioning.

Ramps will be lengthened and brought up to standard, allowing more time to merge safely. Drivers will also be able to address emergency issues with wider shoulders that put more space between them and high-speed traffic, as well as allow for better response time for emergency services during crashes.


The environmental and traffic studies are currently underway and expected to produce preliminary design alternatives by summer 2022. ITD will engage with stakeholders and the public to ensure their feedback is incorporated into the final design. Current schedules aim for this phase to be complete in early fall 2022. Timelines for subsequent phases may be determined after this phase is complete.

Nighttime lane closures from early May to early July will collect data. A shoulder or lane in one direction will be closed at a time between 7 p.m. and 5 a.m., with the first closure scheduled for May 10th. More details on closures can be found here.

Community Involvement

ITD will host a public meeting in early fall 2022. This meeting will provide the public an opportunity to review preliminary design plans and provide feedback, which will be used in the design phase to create a solution that reflects the community’s needs. Notification for this meeting will be sent well in advance, so be sure to sign up for email updates to stay informed.

Prior to the public meeting, ITD will meet with key stakeholders and local governmental officials as well as host workshops with representatives from emergency services and local industry.

Reach the project team at


This study is being funded with Transportation Expansion and Congestion Mitigation (TECM) funds as part of Governor Little’s Leading Idaho initiative. The program allows ITD to accelerate project timelines to address rapid growth and build critical infrastructure today that would otherwise take many years to fund and build.

The corridor is one of 13 approved TECM corridors in the state. Funding for the future design and construction phases on this corridor will be determined based on project readiness and funding availability.

Preliminary estimates value the improvements needed in this corridor at $600 million to $775 million, which includes design, right-of-way and construction costs. Work will likely be completed in stages over many years.

More on TECM funding
© Copyright 2022 Idaho Transportation Department Visit ITD Website

Contact Us

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

Sign up for updates

Signup Form