People interested in learning more about the SR 509 expressway construction work planned in Des Moines, SeaTac, Burien, and Kent can visit a new online open house.

The State Route 509 Completion Project construction online open house will be available to the public now through Oct. 25. 

Contractor crews working for the Washington State Department of Transportation have begun work on the final stage of the SR 509 Completion Project. This fall, crews will begin excavation to build the remaining 2 miles of the expressway between 24th Avenue South and South 188th Street in SeaTac. The first mile of the new tolled expressway, between Interstate 5 and 24th Avenue South, is already under construction and scheduled to open in 2025 as part of Stage 1b of the SR 509 Completion Project.  

The online open house breaks down the construction work by different areas and neighborhoods, making it easy for people to find information, graphic visualizations and maps for construction work most likely to affect them. 

SR 509 Completion Project Open House information

  • WHEN: Wednesday, Sept. 4 – Friday, Oct. 25
  • WHERE: engage.wsdot.wa.gov/sr-509-expressway/
  • DETAILS: In addition to English, the online open house is available in the following languages: Spanish, Vietnamese, Simplified Chinese, Somali, Pashto, Amharic and Khmer

Visitors will also have an opportunity to submit comments and questions. 

Free WiFi access

Free WiFi access is available at several locations for people who do not have broadband access but wish to visit the online open house: 

  • Valley View Library: 17850 Military Road S., SeaTac
  • Des Moines Library: 21620 11th Ave. S., Des Moines
  • Burien Library: 400 SW 152nd St., Burien
  • Tukwila Library: 14380 Tukwila International Blvd., Tukwila 

SR 509 Completion Project information

The SR 509 Completion Project builds 3 miles of new tolled highway between I-5 and South 188th Street near the south end of Seattle-Tacoma International Airport. The new highway will be completed in stages. The portion currently under construction between I-5 and 24th Avenue is scheduled to open in 2025. The final stage will build the remaining 2 miles of the expressway between 24th Avenue South and South 188th Street. The entire project is planned for completion by 2028.

Puget Sound Gateway Program overview

The SR 509 Completion Project is part of WSDOT’s Puget Sound Gateway Program, which also includes the SR 167 Completion Project in Pierce County. Combined, the two completion projects finish critical missing links in Washington’s highway and freight network.

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