The I-5 System Partnership is a stakeholder group made up of representatives from transportation agencies, community organizations, the business community, and jurisdictions throughout the 107-mile study area from Tumwater to Arlington. The I-5 System Partnership views Interstate 5 as the spine of a complex system that includes local streets, highways, transit, freight and emergency response.

The 2021 update to the Project Delivery Plan represents a snapshot as of July 1, 2021 of the project specific plan for work to be delivered by the Department for state fiscal years 2022 through 2028.