Oregon Revised Statutes Highways, Roads, Bridges and Ferries § 368.925

(1) Thirty days after the notice of the determination of the assessment mentioned in ORS 368.915 is mailed to the owner, the entire amount is due and payable at the office of the county sheriff, and if not so paid shall be delinquent from that date and shall bear interest at the rate of eight percent per year until paid.

(2) One year from the date an assessment is delinquent, the county sheriff shall transmit to the county clerk a written description of the property, the name of the person to whom assessed, the amount of the assessment and the interest due. The county clerk shall issue a writ of execution thereon, directed to the sheriff of the county. The sheriff shall proceed to collect the unpaid assessment by advertising and selling the property in the manner provided by law for the sale of real property on execution, but no property shall be sold for a sum less than the amount of the unpaid assessment plus interest and the cost of advertising and sale.