Or. Rev. Stat. § 179.331
(1) The superintendents shall be appointed and, whenever the public service requires such action, may be removed, suspended or discharged, as follows:
[1965 c.616 §81 (enacted in lieu of 179.330); 1969 c.597 §26; 1971 c.301 §17; 1987 c.320 §119; 2003 c.14 §75; 2009 c.595 §132; 2013 c.36 §40; 2015 c.318 §11]