Oregon Revised Statutes Procedure in Criminal Matters Generally § 144.785

(1) The commission shall propose to the board and the board shall adopt rules regulating variations from the ranges, to be applied when aggravating or mitigating circumstances exist. The rules shall define types of circumstances as aggravating or mitigating and shall set the maximum variation permitted.

(2) In no event shall the duration of the actual imprisonment under the ranges or variations from the ranges exceed the maximum term of imprisonment fixed for an offense, except in the case of a prisoner who has been sentenced under ORS 161.725 as a dangerous offender, in which case the maximum term shall not exceed 30 years.