California Highway Patrol and Cal Fire San Luis Obispo responded to a motorcycle accident on Santa Rosa Creek Road.
It happened just after 3:15 p.m. Wednesday, six miles north of Highway 46 in San Luis Obispo County.
A witness told authorities the motorcycle was in a creek bed and the rider was lying in the street. CHP officials said the motorcyclist was killed in the crash.
The cause of the accident is under investigation. There are no road closures at this time.