18 year old Gabriela Rodriguez struck a tree along Highway 126 and Bradley Road just before 8 p.m. Sunday night.
She needed to be extricated from the vehicle and was life flighted to St. Charles.
Officers say she was west bound on Highway 126 towards Sisters when it happened.
They say alcohol does not appear to be a factor in the crash, but arean't sure why her car left the roadway.
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