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I-5 Study

Planning study news

December 16, 2022 update: The seismic report was submitted to the Legislature. Recommendations for planning and environmental linkages (PEL) and HOV systemwide efficiency are underway and due to the Legislature on June 30, 2023.

In progress


In Spring 2022 the Legislature initiated the Move Ahead Washington funding package to create planning and environmental linkages studies for Interstate 5. This work will ultimately create a master plan for the critical I-5 corridor that meets current and future transportation needs, and reflects WSDOT’s strategic plan, which includes resiliency, equity and workforce development goals.

The initial phase of this study in underway. WSDOT is currently:

  • Developing an initial assessment of seismic risk and recommendations for future analysis and cost estimate for I-5 from Boeing Field to Lake City Way.
  • Developing near term recommendations for improving the HOV system and evaluating other techniques for making the HOV system more efficient.
  • Conducting up to 70 listening sessions with key jurisdictions and other stakeholders statewide, and developing an interim report on planning-environmental linkages (PEL) recommendations for I-5 which will identify future decision-making and engagement opportunities.
The I-5 Study area; the study will assess the corridor and provide PEL and HOV system recommendations and conduct an initial seismic risk assessment and recommend future analysis.