ORS § 541.050
Every corporation having constructed a ditch, canal, flume or reservoir under the provisions of the Act of 1891, pages 52 to 60, Oregon Laws 1891, shall be liable for all damages done to the persons or property of others, arising from leakage or overflow of water therefrom growing out of want of strength in the banks or walls, or negligence or want of care in the management of the ditch, canal, flume or reservoir. However, damage resulting from extraordinary and unforeseen action of the elements, or attributable in whole or in part to the wrongful interference of another with the ditch, canal, flume or reservoir, which may not be known to the corporation for such length of time as would enable it by the exercise of reasonable efforts to remedy the same, shall not be recovered against the corporation.
ORS 541.050