ORS § 547.430
Any person who throws, dumps or places or allows to be thrown, dumped or placed, any rubbish, refuse, or any article or thing in any such ditch, lateral, canal, slough, waterway or conduit shall, in addition to the penalty provided in ORS 547.990, also be liable to the owner of the ditch, lateral, canal, slough, waterway or conduit, or other person or district having control, charge or supervision of the same, for all expense legitimately occasioned or incurred by such person or district in the removal of any such rubbish, refuse or other article or thing or the prevention of such befoulment or pollution, and for all damage that may be done or occasioned to the ditch, lateral, canal, slough, waterway or conduit by reason of such dumping, throwing or placing of the rubbish, refuse or article or thing, or the befoulment or pollution. The sum may be recovered in a civil action brought in the name of the person or district having control of or using the ditch, lateral, canal, slough, waterway or conduit that was injured, damaged, befouled, polluted or obstructed.
ORS 547.430