ORS § 221.905
The mayor and alderpersons mentioned in ORS 221.902 shall receive no compensation whatever for their services as such officers. The recorder, treasurer, marshal, police and other subordinate officers shall severally receive at stated times compensation to be fixed by ordinance by the council, which compensation shall not be increased nor diminished after their election, or during their several terms of office. Nothing contained in this section shall be construed to prevent the council from fixing several amounts of compensation, in the first instance, during the term of office of any such officer after the election of the officer. The compensation of all other officers shall be fixed from time to time by ordinance, duly passed by the council.
ORS 221.905