ORS § 88.110
Except as provided in ORS 88.120, no mortgage upon real property shall be a lien upon such property after the expiration of 10 years from the later of the date of maturity of the mortgage debt, the expiration of the term of the mortgage debt or the date to which the payment thereof has been extended by agreement of record; and after such 10 years the mortgage shall be conclusively presumed paid and discharged, and no suit shall be maintainable for its foreclosure. If neither the date of maturity nor the term of the debt is disclosed by the recorded mortgage or recorded memorandum thereof, then the date of the execution of the recorded mortgage or recorded memorandum thereof shall be deemed the date of maturity and expiration of the term of the mortgage debt for purposes of this section. If the mortgage and a memorandum or memoranda thereof are of record and no date of maturity or statement of the term of the mortgage is contained in the mortgage or memoranda, then the date of execution of the earliest document of record shall be used to determine the date of maturity and the expiration of the term of the debt.
ORS 88.110