Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 549.120

Thereupon the court shall appoint three disinterested householders of the county as a commission and shall issue an order directing them to meet on a day named in the order, after subscribing to an oath or affirmation to faithfully and impartially discharge the duties of their appointment. At least three days' notice of the time and place of the meeting shall be given to all persons through whose lands the ditch is to be located or upon whose lands the natural stream is to be straightened, enlarged, or its banks are to be strengthened or built up.