Oregon Revised Statutes Highways, Roads, Bridges and Ferries § 371.455

After expiration of the time for filing nominations for a regular district election, if the board of directors determines that the number of candidates nominated equals the number of positions to be filled on the board, the district need not hold the election. Instead, the board of directors, within 10 days after expiration of the time for filing nominations, shall declare the candidate or candidates elected.