• Study

I-5 Skagit Transportation Study

Planning study news

The Washington State Department of Transportation, Northwest Region Mount Baker Area is initiating the Interstate 5 Skagit Transportation Study. The study is part of a larger statewide effort to look at mobility and safety on I-5 in Washington. We are evaluating current and future conditions on I-5 in Skagit County between the Old Highway 99 Interchange at exit 224 and the Cook Road Interchange at exit 232 to identify near and mid-term strategies and solution alternatives to address multimodal safety and operational needs. This study is the first step toward identifying a long-term vision of multimodal investments that are needed to accommodate future growth and travel demands.

March 2023 - July 2024
In progress


The 9-mile stretch of I-5 between Mount Vernon and Burlington is the backbone of the transportation network in Skagit County, powering the economy, linking local businesses to regional markets and connecting people to jobs, goods and each other. To plan for future growth, address safety and operations challenges and support the potential of the corridor and region, WSDOT is conducting the I-5 Skagit Transportation Study to identify and assess strategies to improve mobility, connectivity and safety for all users.

Public comment period is open

We want your input to help understand how the community uses I-5 and local roads to move throughout the study area and Skagit County. Please share your comments online via an online survey.

The survey will be open through June 26, 2023. We will use your input to guide decisions about potential solution alternatives on the I-5 Skagit Transportation Study.

Community engagement will play a central role in this study to ensure we understand and respond to the needs and concerns of those that use I-5 in Skagit County. We will be share regular updates through our project website, emails, social media, and other channels to keep everyone informed about our progress and share opportunities to stay involved.

Planning study report

View from northbound I-5 at 4th Street in Skagit County, a section of I-5 included in the I-5 Skagit Transportation study.