Oregon Revised Statutes Public Health and Safety § 440.335

(1) The directors of a health district shall, at the time of their organization, choose from their number a chairperson, a secretary and a treasurer, who shall hold their offices until their successors are elected and qualified.

(2) These officers shall have, respectively, the powers and shall perform the duties usual in such cases.

(3) A majority shall constitute a quorum to do business and, in the absence of the chairperson, any other member may preside at any meeting.