2015 ORS § 261.430¹
Board meetings

(1) A majority of members of the board of directors shall constitute a quorum for transaction of official business. The decision of a majority of the board shall be deemed to be the act or decision of the board. No vacancy of less than a majority of members of the board shall impair the right of the remaining board members to exercise all powers of the board.

(2) The board of directors shall adopt rules to govern its meetings.

(3) All legislative sessions of the board of directors, whether regular or special, shall be open to the public.