A 48-year-old mountain biker was airlifted out of Sugarloaf Ridge State Park Sunday morning after crashing on a trail near the summit of Bald Mountain.
The Sheriff's Helicopter Henry 1 was dispatched to the park near Kenwood about 11:20 a.m.
"He doesn't know how he crashed. It's real steep and those mountain bike trails are pretty gnarly," said Sheriff's Deputy Chris Mahoney.
Although the cyclist was able to stand, rescue crews, concerned about a possible head injury, opted to helicopter the man to Santa Rosa Memorial Hospital rather than wait for an ambulance, Mahoney said.
"Head injuries could intimately result in death. They're serious enough so we didn't waste any time," he said.
The cyclist was on an approved trail, he said.