Overnight lane closures on I-5 in the Des Moines, SeaTac, and Kent areas continue Aug. 12 through Aug. 16, as crews working for the Washington State Department of Transportation (WSDOT) reconfigure and stripe lanes for the final stage of the Veterans Drive tunnel.

Crews will also close lanes on SR 509 and local roads in the area to perform soil testing and build road improvements.

This work is part of the SR 509 Completion Project.

I-5 lane closure information 

Monday, Aug. 12 through the morning of Friday, Aug. 16:

  • 11:59 p.m. to 6 a.m. – Up to three lanes of southbound I-5 will close nightly between South 200th Street/Military Road South (Exit 151) and SR 516 (Exit 149).
  • 8 p.m. to 6 a.m. – The HOV lane of northbound I-5 will close nightly between SR 516 (Exit 149) and South 200th Street/Military Road South (Exit 151).

SR 509 lane closures 

Wednesday, Aug. 14 through the morning of Friday, Aug. 16:

  • 8 p.m. to 5 a.m. – One lane of northbound SR 509 will close overnight between South 188th and South 160th streets.

Local road closures 

Monday, Aug. 12 through Friday, Aug. 16:

  • 7 p.m. to 5 a.m. – One lane of South 208th Street will close nightly. Flaggers will alternate traffic.

Wednesday, Aug. 14 through the morning of Thursday, Aug. 15:

  • 8 p.m. to 6 a.m. – One lane of Des Moines Memorial Drive will close nightly between South 192nd Street and South 196th Place. Flaggers will alternate traffic.

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.