A semi-truck rollover crash closed all lanes to the northbound lanes of SR 509 in SeaTac Wednesday morning, Sept. 10, 2025, according to the Washington State Department of Transportation (WSDOT).
The crash – on the right shoulder of the recently re-done entry lanes to northbound SR 509 – prompted a hazardous materials response, and drivers were advised to avoid the area until further notice.
The 911 dispatch call came in at 9:00 a.m.
Crews were on scene to contain the spill and clear the wreckage.
Officials did not immediately release details about injuries or what the hazardous cargo was.
The collision was cleared in the late afternoon, and all lanes were re-opened.
Here is what it looks like. pic.twitter.com/WaMVeivPTF
— Trooper Rick Johnson (@wspd2pio) September 10, 2025
UPDATE 2: One right lane of NB SR 509 at Des Moines Way S and the on-ramp from S 188th are blocked due to a collision. We are seeing heavy backups in the area at this time.
— WSDOT Traffic (@wsdot_traffic) September 10, 2025
Continue to expect delays especially around the airport @flySEA @SeaTacWA https://t.co/UNyUqv17D9 pic.twitter.com/rkO5bfVPGu
Crews from @Southkingfire, @KingCountyFire2, @RentonRFA, @PugetSoundFire responded to reports of a potential hazardous chemical leak from an ovterturned truck on NB SR 509 in SeaTac along with @wsdot, Washington State Patrol and King County Medic One. pic.twitter.com/Q6Dzs9qFuk
— ZONE3PIOs (@ZONE3PIOs) September 10, 2025
Hazmat crews have confirmed that nothing is actively leaking. Expect road closures in this area.
— ZONE3PIOs (@ZONE3PIOs) September 10, 2025
South 188th St in SeaTac is closed to SR 509.https://t.co/JAlH1g2lsz
— KOMO News (@komonews) September 10, 2025
Hazmat crews respond after semi rollover closes lanes on SR 509 by SeaTac https://t.co/WaLl8rSxC6
— KIRO 7 (@KIRO7Seattle) September 10, 2025
