ORS § 555.180
Wherever an irrigation system has been constructed under contract with the State of Oregon pursuant to the Act of Congress known as the Carey Act, and under and pursuant to ORS 555.010 to 555.160, and it develops that the acreage of land actually irrigated in any smallest legal subdivision of the land is greater than the acreage made subject to the lien in the reclamation contract for said smallest legal subdivision and the waters for the excess acres actually irrigated in such legal subdivision over and above the amount fixed in the contract for lien have not as yet been paid for, nor the amount to be paid therefor agreed upon, the Water Resources Commission upon request of the company supplying water to the excess acres shall notify the person using the water upon the excess acres to pay for the same or enter into an arrangement with the company furnishing the water providing for the price to be paid therefor and the manner of payment; provided, the company furnishing the water shall not exact a price per acre for such excess acres greater than the price per acre as now fixed by the commission.
ORS 555.180