Nightly I-5, SR 509, and local closures in south King County continue next week

Multiple overnight lane and ramp closures on I-5 in the Des Moines, SeaTac, and Kent area continue Aug. 5 through Aug. 9, as crews working for the Washington State Department of Transportation reconfigure and stripe lanes for the final stage of the Veterans Drive tunnel.

Crews will also close lanes on State Route 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. 5 through the morning of Friday, Aug 9:

• 9:30 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).

Monday, Aug. 5 through the morning of Friday, August 9:

• 10 p.m. to 6 a.m. – Up to two lanes of southbound I-5 will close nightly between South 200th Street/Military Road South (Exit 151) and SR 516 (Exit 149).

I-5 ramp closure information

Monday, Aug. 5 through the morning of Wednesday, Aug. 7:

• 11:59 p.m. to 6:30 a.m. – The eastbound SR 516 to northbound I-5 on-ramp will close. A signed detour will be in place.

SR 509 lane closures

Wednesday, Aug. 7 through the morning of Friday, Aug. 9:

• 8 p.m. to 5 a.m. – One lane of northbound SR 509 will close overnight between South 176th Street and South 156th Street.

SR 509 ramp closures

Wednesday, Aug. 7 through the morning of Friday, Aug. 9:

• 9 p.m. to 5 a.m. – The South 160th Street on-ramp to northbound SR 509 will close. A signed detour will be in place.
• 7 p.m. to 5 a.m. – The Des Moines Memorial Drive on-ramp to northbound SR 509 will close. A signed detour will be in place.

Local road closures

Monday, Aug. 5 through the morning of Wednesday, Aug. 7:

• 7 p.m. to 5 a.m. – One lane of South 200th Street, South 188th Street, and Des Moines Memorial Drive will close. 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 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.

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.