Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 537.385

(1) Notwithstanding any condition or limitation of a water right permit issued under ORS 537.211 or 537.625 or a water right certificate issued under ORS 537.250, 537.630 or 539.140, upon receipt of a request by the State Department of Agriculture, the Water Resources Commission may, by rule, extend the irrigation season of a subbasin beyond the period established by adjudication, by rule or by condition imposed on a permit or certificate, if the commission finds:

(2) If the source of water identified in the request is stored water and water is available from the storage source during the period of the extended irrigation season, the commission may extend the irrigation season as requested without making the findings required by subsection (1) of this section. However, use of water during the extended period shall be limited to the stored water.

(3) In order to ensure that use of water during an extended irrigation season does not injure existing and future water rights, use of water during the extended period of the irrigation season shall be subordinated to all existing and future water rights.

(4) Use of water during the extended irrigation season shall comply with all conditions and limitations of the permit or certificate, including the rate, duty and place of use of the right.

(5) Use of water shall be regulated among irrigators for whom the season has been extended during the extended irrigation season according to the priority date of the permit or certificate.