A Cazadero man was in critical condition Monday, suspected of drunken driving late Sunday night when he crashed off remote Cazadero Highway and suffered serious injuries, according to the CHP.

The 30-year-old Cazadero driver, Ryan Sheeran, lost control of a Subaru Outback, ran off the two-lane roadway and smashed into a redwood tree, CHP Sgt. Al Capurro said.

The crash was reported at 10:54 p.m. The driver crashed south of Kramer Road while traveling toward the community of Cazadero.

Cazadero Fire Chief Steve Krausman was first to reach the crash, arriving at 11:06 p.m., according to Sonoma County fire emergency dispatch records.

Sheeran was taken by a Russian River ambulance crew to Guerneville School for a rendezvous with a Reach medical helicopter. He then was flown to Santa Rosa Memorial Hospital, the CHP said.

At the hospital, preliminary tests showed Sheeran was above the legal limit for blood-alcohol percentage, officials said. CHP officers arrested him on suspicion of DUI and then released him to the hospital because of his injuries.

A hospital spokeswoman Monday said Sheeran was being treated in the intensive care unit.