Oregon Revised Statutes Highways, Roads, Bridges and Ferries § 371.338

(1) The powers of a special road district are vested in a district board of commissioners consisting of three commissioners appointed by the county court. Each commissioner shall be an elector of the district. The term of office of a commissioner is three years commencing on January 1 of the year of appointment. Vacancies on the board shall be filled by the county court by appointment for the unexpired term.

(2) Notwithstanding the three-year term of office prescribed in subsection (1) of this section, of the commissioners first appointed to a board one commissioner shall be appointed for a term ending December 31 of the second year following the year in which that commissioner first takes office, one commissioner for a term ending December 31 of the year following the year in which that commissioner first takes office and one commissioner for a term ending December 31 of the year in which that commissioner takes office.

(3) Before entering upon the duties of office, a commissioner shall take and subscribe an oath to support the Constitution and laws of the State of Oregon and of the United States, and to well and faithfully perform the duties of office to the best of the commissioner's knowledge and ability.