Oregon Revised Statutes Highways, Roads, Bridges and Ferries § 368.256

(a) Any water to overflow, seep or otherwise discharge from that land onto a public road under county jurisdiction including, but not limited to, water that is passing over the land, diverted from the land by an obstruction on the land, flowing from the land because of rainfall or discharged from an irrigation sprinkler or other device.

(b) Any structure, tree, drainage way, soil deposit or other natural or man-made thing on that land to present a danger to or create a hazard for the public traveling on a public road or facilities within the right of way of the public road by obstructing, hanging over or otherwise encroaching or threatening to encroach in any manner on a public road that is under county jurisdiction.