The incident happened just after midnight at the intersection of 4th and Alameda streets.
Investigators say the officer was driving along a Ford Mustang when the driver of the car started to make a left hand turn and hit the officer. The officer lost control of the motorcycle and crashed.
The officer was transported to the hospital in stable condition.
Alcohol was not a factor in the crash. It was unclear if the driver of the Mustang will face any charges.