• Study

I-5 Study

Planning study news

In December 2024, WSDOT submitted two reports to the Legislature. The I-5 Master Plan Future Phases and Funding Plan outlines the next steps and funding need to develop the I-5 Master Plan. The I-5 Ramp Reconfiguration Study informs future City of Seattle lid planning and work to be conducted during WSDOT’s I-5 Master Plan. These reports can be found in the “Outcomes” section below.

Timeline
2022-2029
Status
In progress
Budget
Intended $40,000,000

Purpose

The I-5 Master Plan is now coordinating with the Cascadia High-Speed Rail study to address the future transportation needs of Western Washington communities. The integrated Cascadia High-Speed Rail and I-5 Program allows us to look holistically at highway, rail, and other travel options. 

In Spring 2022, the Legislature initiated the Move Ahead Washington funding package to create planning and environmental linkages (PEL) studies for Interstate 5, providing the framework for a border-to-border I-5 Master Plan PEL Study. WSDOT then began initial planning and data collection and launched the I-5 Master Plan process earlier this year. To date, the I-5 Program has completed six legislative studies and reports and initiated the master planning/PEL study process to advance toward a vision for I-5.

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.