2011 ORS § 830.340¹
(1)(a) Except as provided by paragraph (b) of this subsection, when two boats are approaching each other head on or nearly so (so as to involve risk of collision), each boat shall bear to the right and pass the other boat on its left side.
(b) On rivers, or those sections of rivers, which are state waters, boats proceeding downstream shall have the right of way over boats proceeding upstream.
(2) When boats approach each other obliquely or at right angles, the boat approaching on the right side has the right of way.
(3) One boat may overtake another on either side but shall grant right of way to the overtaken boat. [Formerly 488.110 [bad link]]