Multiple lanes of northbound I-5 near SR 599 at milepost 156 were closed after a fatal collision Friday morning, March 7, 2025 in Tukwila.
Washington State Patrol said the crash occurred on the SR 599 / Interurban overpass, where one of the vehicles ended up going off the overpass onto northbound I-5.
The left lane on the northbound I-5 off-ramp to SR 599 was also closed.
Emergency crews were on scene.
There is no estimate when lanes will reopen, and drivers should expect delays in the area.
Real-time travel information is available from the WSDOT mobile app, the WSDOT Travel Center Map or by signing up for WSDOT’s email updates.

#BlockingAlert There is a fatal collision that occurred on the SR 599 / Interurban overpass where one of the vehicles ended up going off the overpass onto NB I-5. The overpass is down to one lane and multiple lanes blocked on I-5. More info to come.
— Trooper Rick Johnson (@wspd2pio) March 7, 2025
Puget Sound Fire, @KingCoMedicOne , and WSP is on scene of a serious injury accident on northbound I-5, near the Interurban Avenue exit. All lanes are blocked except the right lane. pic.twitter.com/dRH8WqbDXc
— Puget Sound Fire (@PugetSoundFire) March 7, 2025
UPDATE: Just a single right lane is open on NB I-5 at SR 599 in south Seattle for a rollover collision. The left lane on the NB I-5 overpass ramp to SR 599 is also blocked.
Backups are now 4 miles. Avoid the area if possible. Seek alternate routes and prepare for delays. https://t.co/FhItt4o3J7 pic.twitter.com/jA9ZM8GwLn
— WSDOT Traffic (@wsdot_traffic) March 7, 2025
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