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Clearwater Crossings: Spalding and Arrow Bridges

The Clearwater River crossings at Spalding Bridge and Arrow Bridge are important regional connections for drivers including the trucking and logging industries.

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Proposed changes to the US-95 and US-12 bridges over the Clearwater River would improve traffic flow and enhance safety for present and future users as they cross the Clearwater River at U.S. Highway 95 and U.S. Highway 12 east of Lewiston.

Both bridges and their associated highway intersections require improvements to meet current design and safety standards and provide updated bridges to last for many years to come. Each bridge has a unique environmental study underway evaluating improvements and considerations including wetlands, cultural and historical resources, right of way, noise, and fisheries. Detailed design and construction will follow the study.

Spalding Bridge

Spalding Bridge is approximately 9 miles east of Lewiston on US-95 at milepost 304 and was built in 1962. ITD is proposing to replace the existing narrow bridge with dual bridges, creating two lanes of traffic in each direction with improved lane and shoulder widths. Additionally, ITD is making operational and safety improvements at the US-95 and US-12 interchange.

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Arrow Bridge

Arrow Bridge is approximately 13 miles east of Lewiston on US-12 at milepost 15 and was built in 1972. ITD is proposing to replace the existing bridge with a new two-lane bridge with wider lanes and shoulders. Additionally, ITD is planning to reconfigure the nearby US-12 and SH-3 intersections to enhance traffic flow and improve safety between the two highways.

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Safety Benefits

These bridges were built over 50 years ago, and they need to be upgraded to meet current and future traffic needs. In addition, widening the bridges will improve traffic flow. Other improvements, such as improved shoulder widths, smoother curves, increased sight lines, and dedicated turn lanes will enhance the overall safety for users of these bridges.


The environmental studies of the Clearwater Crossings at Spalding and Arrow projects started in late 2021. The goal of each study is to ultimately secure an approved National Environmental Policy Act (NEPA) document. This approval will allow ITD to make improvements to the bridges and nearby intersections after considering the environmental impacts and input from the public, stakeholders, and partners.

If NEPA documents are approved, funding will need to be identified and secured to advance the projects to detailed design and then construction. Pending NEPA approval, detailed designs may start in 2024, and construction may start as early as 2025 and take multiple construction seasons. During construction of the new structures, the existing bridges would remain open to vehicles.

Community Involvement

Public input will help shape a community-appropriate solution. Opportunities will be available for the public, stakeholders, and partners to provide input at key milestones.

To stay up to date on the projects and learn about future input opportunities, sign up for email updates on this site, or reach out to the team at [email protected].


These studies are 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.

Funding for the future design and construction of these bridges will be determined based on project readiness and funding availability. For more information on the TECM program, visit


**All contact information will be kept confidential,
but all comments will be publicly visible**
Interactive Comment Map

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Nov. 8, 2023

You are invited to a public meeting on Nov. 8, 2023

Join us for a public meeting to provide input on plans to update these bridges to current design and safety standards.
WHEN: Wednesday, Nov. 8, any time between 4-7 p.m.
WHERE: Clearwater River Casino and Lodge at Aht'Wy Plaza, 17500 Nez Perce Road

If you can't join in person, visit the self-guided virtual public meeting and take the online feedback survey by Nov. 22.

Click here to visit the virtual public meeting. Click here to take the feedback survey.
Mid-October 2022

Investigative Work Begins

The project team will be doing geophysical investigations this fall. This means that for two days (one day per bridge) during the second week of October, a few team members will be on the river in a small boat using an electromagnetic detection system to understand the rock depth in both bridge locations.

These investigations will help the team accurately complete the environmental assessment and design the bridge foundations.

No impacts to traffic or the neighboring community are anticipated as this work is completed.

Fall 2021

Environmental Work of Spalding and Arrow Bridges Started


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