A 26-year-old Oak Harbor man was seriously injured in a one-car accident Sunday night.

Oak Harbor Police Chief Rick Wallace said Adam Sims was driving a 2003 Dodge Durango east on Crosby Road at an estimated 80 miles per hour.

Sims didn’t stop at the intersection with Oak Harbor Street, Wallace said, but traveled across the intersection, left the roadway, went airborne down an embankment and struck a large tree.

The accident occurred at about 10:30 p.m.

Sims was severely injured and was airlifted straight to Harborview Medical Center in Seattle for treatment. He was upgraded from critical to serious condition in the intensive care unit Tuesday morning, according to a Harborview spokeswoman.

Wallace said investigators suspect that Sims may have been intoxicated at the time of the crash.