Oregon Revised Statutes Procedure in Criminal Matters Generally § 133.120

(1) A judge of the Supreme Court or the Court of Appeals may issue a warrant of arrest for any crime committed or triable within the state, and any other magistrate mentioned in ORS 133.030 may issue a warrant for any crime committed or triable within the territorial jurisdiction of the magistrate's court.

(2) Notwithstanding subsection (1) of this section, a circuit court judge duly assigned pursuant to ORS 1.615 to serve as a judge pro tempore in a circuit court may issue a warrant of arrest for a crime committed or triable within the territorial jurisdiction of any circuit court in which the judge serves as judge pro tempore if the request for the warrant includes an affidavit showing that a regularly elected or appointed circuit court judge for the judicial district is not available, whether by reason of conflict of interest or other reason, to issue the warrant within a reasonable time.