Oregon Revised Statutes Property Rights and Transactions § 92.130

Any additional tracings of subdivision or partition plats as mentioned in ORS 92.120 other than the one copy filed with the county surveyor shall be transferred to the county surveyor who then shall keep them well bound and safeguarded as required by law. If the original subdivision or partition plat or copy thereof is lost, destroyed, mutilated or missing from the county records, the county surveyor shall make a copy thereof, and file it in the proper office of record. Each such copy made by the county surveyor pursuant to this section shall bear a certificate of the surveyor that it was made in compliance with this section, and that it is a true copy of the original record.