The I-5 Boone Bridge crosses the Willamette River in Wilsonville. It is an important link on I-5, which is the main north-south highway on the West Coast for international, national, state, and regional travel and freight movement. The bridge is at risk of failing in a Cascadia Subduction Zone Earthquake and is part of the state's designated Seismic Lifeline Route.
Currently, there are more than 126,000 vehicles including an average of 17,000 trucks crossing the bridge every day. Expected population and economic growth in the region will increase the delays drivers experience in the project area due to congestion, which affects interstate and local road movements. The area has also been identified by ODOT as a high crash rate location.
ODOT is exploring solutions to these issues as part of the I-5 Boone Bridge Replacement Project. The project will replace the existing bridge with a new one that can withstand a major earthquake, enhance traffic flow and travel time reliability and improve safety connections. Additionally, the project will provide new walking and biking options over the Willamette River.
The Planning and Environmental Linkage process is a collaborative approach to transportation decision-making that gathers community and agency input early in project development to fully establish the needs and goals of the project, and identify possible solutions, before conducting analysis under the National Environmental Policy Act process.
Replace Boone Bridge with a new bridge capable of withstanding a Cascadia earthquake event.
Add a southbound ramp-to-ramp (auxiliary) lane between the Wilsonville Road entrance and OR 551 exit.
Make adjustments to Miley Road (Charbonneau) interchange ramps for safer merging.
Add wider shoulders for safety.
Provide new walking and biking options over the Willamette River.
Technical Report and Supporting Documents
In the previous phase of this project, we studied how making changes to I-5 near the Boone Bridge could affect how people travel and how land is used. We put together a short version of what we found in the study along with our answers to questions about travel, land use, access and traffic. You can find this information in the project documents below.
Important discoveries from the study are shared in an executive summary report submitted to the Oregon Legislature in January 2021. If you are interested in all the details about how we did the study and what we found, you can read the I-5 Boone Bridge and Seismic Improvement Project technical report.
Project Area Map
I-5 at the Boone Bridge in Wilsonville
Cost and Funding
The Planning and Environmental
Linkage phase of the project is funded with $4 million. Funding for
environmental review, design and construction is not available at this time so
work will stop after the completion of preliminary planning. Preliminary planning
will be complete by early 2025.
Información en español.
For ADA (Americans with Disabilities Act) or Civil Rights Title VI accommodations, translation/interpretation services, or more information call 503-731-4128, TTY 800-735-2900 or Oregon Relay Service 7-1-1.
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