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Board adopts updated Sound Transit 3 System Plan
On May 28, the Sound Transit Board adopted an updated ST3 System Plan to guide the next phase of transit expansion projects across the region. This action established a sustainable path forward to address an estimated $34.5 billion gap in the agency’s financial plan over the next 20 years and deliver the voter-approved ST3 program.
The updated System Plan keeps projects moving with available funding and directs the agency to pursue cost savings, additional funding opportunities, and project delivery efficiencies to advance the ST3 program.
For more information, read our recent Platform article or dive deeper into Resolution R2026-11.
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The Board’s commitment to completing environmental review and design for the full project creates multiple paths to address the affordability gap. Moving forward with this work will allow the agency to continue refining the project, identifying opportunities to reduce costs, and pursuing additional funding and financing tools. Importantly, it maintains momentum on the project and provides the runway to secure additional funding and unlock cost savings that will deliver light rail at Boeing Access Road.
While construction of Boeing Access Road Station is not currently affordable, Sound Transit will develop a plan for identifying cost savings and alternative financing and delivery options for the Boeing Access Road Station in collaboration with the City of Tukwila and King County. This plan is expected to be submitted to the Board as soon as February 2027.
 What's coming next for the project?
The next major milestone will be the completion of preliminary engineering and publication of environmental documentation, which is anticipated to be available to the public in early 2027. Following this, the project will complete the Planning phase and move into the Design phase.
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As the timeline continues to advance, we’ll share more information about future milestones through email updates and on our project website. Community input will continue to play an important role as we advance design and work toward delivering the Boeing Access Road Station.
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