44 year old Michael Osborne is charged with engaging in a consensual sexual relationship with a 16 year old girl.
He has been placed on paid administrative leave while the investigation continues.
Osborne has been a coach in central Oregon since 2000.
Police officers search Osborne's coaches area at the high school and his home.
Jefferson County's District Attorney says given Osborne's lengthy coaching history, he expects the investigation could be fairly lengthy.