The California Highway Patrol reported the fatality at around 9:30 a.m. Thursday on Seigler Springs Road.
CHP and fire officials responded to the scene, where Lake County News correspondent Roger Kinney witnessed the male victim being brought up from the creek in a rescue basket.
Kinney said it appeared that the motorcycle rider went straight rather than following the lefthand turn and went into the creek as a result.
The motorcyclist reportedly was aboard a blue sport bike that was destroyed in the wreck.
The CHP offered no other details by day's end, and did not identify the crash victim.
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