Oregon Revised Statutes Property Rights and Transactions § 96.060

(1) When any person has built or builds, by mistake and in good faith, a fence on the land of another, such person or the successor in interest of the person may, within one year from the time of discovering the mistake, go upon the land of the other person and remove the fence, doing no unnecessary damage thereby.

(2) The occupant or owner of land whereon a fence has been built by mistake shall not throw down or in any manner disturb such fence during the period which the person who built it is authorized by subsection (1) of this section to remove it.