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Washington State Department of Transportation
Puget Sound Gateway Program – 999 Third Ave., Suite 2300 – Seattle, WA 98104 – 206-770-3500
TRAVEL ADVISORY
Sept. 19, 2024
Contact: Sidney Orr, communications, 206-462-6357
Nightly I-5 and daytime local road closures in south King County continue the week of Sept. 23
SEATAC – Overnight lane closures on Interstate 5 in the SeaTac, Des Moines and Kent area continue Monday, Sept. 23 through Thursday, Sept. 26. The closures will allow contractor crews install temporary barrier along I-5. Crews will also close lanes on local roads in SeaTac for road improvements and soil testing.
This work is part of the State Route 509 Completion Project.
I-5 lane closure information
Monday, Sept. 23 through the morning of Thursday, Sept. 26
- 9 p.m. to 4 a.m. – Up to three lanes of northbound I-5 will close nightly between SR 516 (Exit 149) and South 200th Street/Military Road South (Exit 151).
Local road closure information
Monday, Sept. 23 through Friday, Sept. 27
- 7 a.m. to 3 p.m. – One lane of South 208th Street in SeaTac will close daily. Flaggers will alternate traffic.
Photos of construction work are available on the project’s Flickr page. An interactive project map that allows people to explore the new SR 509 Expressway, the SR 516 interchange and other elements of the completion project is also available online.
SR 509 Stage 2 online open house
People who live in, work in, or travel through Burien, Des Moines, SeaTac, or Kent can visit the SR 509 Stage 2 online open house to learn more about current and planned construction. The online open house runs through Oct. 25.
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 in 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.
Know before you go
Before heading out the door, travelers can find the latest information on the WSDOT app, the real-time travel map, or by subscribing to WSDOT’s email and text alerts.
Hyperlinks within the release:
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WSDOT keeps people, businesses and the economy moving by operating and improving the state's transportation systems. To learn more about what we're doing, go to www.wsdot.wa.gov/news for pictures, videos, news and blogs. Real time traffic information is available at wsdot.com/traffic.
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