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Southbound I-5 reopened just south of SR 531 in Arlington by the Costco near the Smokey Point interchange.

✅CLEAR 9:20 AM: All lanes have now reopened on SB I-5 near SR 530 in . Please allow time for the 4-mile backup to clear as well.

— WSDOT Traffic (@wsdot_traffic)

The State Patrol is reporting a semi, an SUV, and a motorcycle were involved in a crash.   The driver of the motorcycle has died at the scene.

UPDATE 3:04 AM: All lanes of SB I-5 are closed just south of SR 531/172nd St. NE near for a collision.

There is no ETA when the highway will reopen. Please seek alternate routes.

— WSDOT Traffic (@wsdot_traffic)

All southbound traffic is being diverted off the freeway at SR 531/Smokey Point.

The crash was reported at around 3 a.m. Tuesday.

The lanes are closed just south of State Route 531/172nd Street Northeast. The closure has caused a five-mile backup from Arlington to the Tulalip Casino and Outlet Mall.

UPDATE 5 AM: The backup from this crash on SB I-5 in is about 2 miles and growing.

Traffic is being diverted off at SR 531/172nd St NE. Still no ETA to reopen, so PLEASE allow yourself extra time if you need to travel through the area.

— WSDOT Traffic (@wsdot_traffic)

³ÉÈËXÕ¾ Newsradio reporter Sam Campbell reports the Washington State Patrol is already investigating the accident.

Contributing: Sam Campbell and Kate Stone, ³ÉÈËXÕ¾ Newsradio