Oregon Revised Statutes Highways, Roads, Bridges and Ferries § 371.349

(1) The powers of a special road district are vested in a district board of commissioners consisting of three commissioners elected by the electors of the district. Each commissioner shall be an elector of the district. The term of office of a commissioner is four years commencing on July 1 following the date of election. A commissioner may serve until a successor is elected and qualified. Vacancies on the board shall be filled by the district board by appointment for the unexpired term.

(2) Notwithstanding the four-year term of office prescribed in subsection (1) of this section, of the commissioners first elected to a board, the term of one commissioner shall end on June 30 of the second year following the year in which that commissioner first takes office.

(3) ORS chapter 255 governs the nomination and election of the commissioners of a special road district and the conduct of all elections in the district.

(4) Before entering upon the duties of office, a commissioner shall take and subscribe an oath to support the Constitutions 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.