Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 537.485

(1) Notwithstanding any other provision of ORS chapter 536, 537, 538, 539, 540, 541, 542 or 543, the priority of any right to the use of conserved water, including an in-stream water right, under an application submitted and approved by the Water Resources Commission under ORS 537.465 and 537.470 shall be either the same as or one minute after the priority of the water right held by the person implementing the conservation measures.

(2) A person who implements a conservation measure may choose the priority of the water right for the conserved water in accordance with subsection (1) of this section. However, the priority date chosen must be the same for the portion of water allocated to the applicant and the portion of water allocated to the state.