The three-vehicle collision was reported around 9:45 a.m. just west of Dike Road, according to the Washington State Patrol.
Troopers believe a westbound 1985 station wagon driven by a 19-year-old Arlington woman crossed the center line and struck an eastbound Ford Explorer.
The station wagon then struck an eastbound car, troopers reported.
All three people were taken to Cascade Valley Hospital in Arlington, according to a State Patrol memo.
The accident is under investigation, trooper Mark Francis said.
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