Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 540.537

(a) The proposed exchange would adversely affect other appropriators.

(b) The proposed exchanges would be too difficult to administer.

(c) The proposed exchange would adversely affect the public interest as determined under ORS 537.170 (8).

(d) A sufficient quantity of water would not be available to replace the water to be used under the exchange. In determining whether replacement water will be equal to the water exchanged, the commission may consider relative consumptive uses and transmission losses.

(a) If water is not applied under the exchange within the time fixed by the commission in the order approving the exchange;

(b) Upon written request signed by all parties to the exchange;

(c) Upon finding that any other termination condition specified in the original order has occurred; or

(d) Upon attainment of a termination date specified in the original exchange order.