Projects and improvements in your county.
Explore the progress of projects focused on creating safe and reliable ways to move people and goods around Washington.
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![Looking in a southeast direction, this photo shows most of the first miles of the future SR 509 expressway in SeaTac, WA.](/sites/default/files/styles/f/public/2025-01/Image_SR509_Featurephoto.jpg?itok=H4mWneHp)
Featured Project
SR 509 Completion Project
The SR 509 Completion Project in south King County builds a new four-lane tolled expressway between I-5 and SR 509's current end near Seattle-Tacoma International Airport, builds new I-5 ramps, improves I-5 interchanges and builds new bridges.
Access the resources you need to maintain and improve the transportation system.
Latest from WSDOT...
- SEATTLE – The Elwha is going to a good home. Everett Ship Repair, a maintenance partner of Washington State Ferries, has purchased Elwha for $100,000.
- Online open house starts Jan. 28 with digital open house events Feb. 5 and Feb. 12
STANWOOD – The secret is out. Work to gain fish habitat in Secret Creek under Interstate 5 in northern Snohomish County begins Feb. 24.