David Costa, 56, suffered major injuries in the collision, which occurred at around 8:45 p.m., according to California Highway Patrol Office Joe Wind.
Wind said Costa was riding his 2006 Yamaha V Star motorcycle eastbound on Highway 20 near Howard Avenue when he was rear-ended by a 1994 Ford Ranger driven by 22-year-old Bruce Scott of Lucerne.
The circumstances that led to Scott rear-ending Costa still aren't clear, said Wind.
Costa was flown via REACH air ambulance to Santa Rosa Memorial Hospital for treatment of major injuries, including a broken left leg, Wind said.
He said Scott was not cited for the crash.
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