The 9 a.m. crash on southbound I-5 near Lowell clogged traffic for more than an hour.
The collision involved a Mazda MX-5 Miata and a Chrysler SUV, Washington State Patrol trooper Mark Francis said.
At least three lanes were blocked. The backup stretched for several miles.
Troopers said a witness reported that the Mazda was being driven erratically shortly before the crash. A Bellingham woman, 58, was behind the steering wheel and is being investigated for drunken driving, Francis said.
The Mazda drove onto the right shoulder and hit a concrete barrier. The car then spun across all four lanes before crashing into an SUV, Francis said.
The SUV rolled onto a jersey barrier before ending up on its side in the carpool lane.
The SUV driver — a Florida man, 51 — was not injured.
His passenger — a Florida woman, 43 — was taken to Providence Regional Medical Center Everett with possible rib injuries.
The Mazda driver also was taken to the same hospital.
More Local News Headlines
Storm hit Index particularly hard, bringing down hundreds of trees Bridge over I-5 enters final phases Lynnwood receives $5 million to widen 196th Street Kids explain it all: 'Thanksgiving is all about turkeys' Jail might start housing Seattle inmates once again Arrest prompts tips to prevent theft of delivered packages Homeless man pleads guilty in knife attack at Lynnwood RV park Recount will decide Lynnwood race; election turnout deemed ‘discouraging’
Our new comment system is not supported in IE 7. Please upgrade your browser here.