ORS § 547.220
The county clerk upon the filing of the order of appointment shall notify each commissioner of appointment by written or printed notice, and in the notice the county clerk shall state the time and place for the first meeting of the commissioners. The secretary of the board of supervisors shall attend the meeting, and shall furnish the commissioners a complete list of all lands in the district, and the names of the owners thereof, as were contained in the petition, at the date of the judgment of the court incorporating the district. The secretary shall also furnish the commissioners a copy of the plan for reclamation, with maps and profiles in the office of the secretary. The commissioners at the meeting, or within 10 days thereafter, shall each take and subscribe to an oath that they will faithfully and impartially discharge their duties as commissioners and make a true report of the work done by them. They shall also at the meeting elect one of their own number chairperson. The secretary of the board of supervisors shall be ex officio secretary of the commissioners.
ORS 547.220