Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 549.350

On the completion of the work by the county, the county surveyor or the county engineer shall make and file with the county clerk a report showing in detail the work done on each parcel of land separately owned, the names of the owners, and the amount of costs to each such parcel of land. The cost shall be assessed against the owner of the lands by the county court. Any unpaid assessment may be recorded with the county clerk in any county of this state. The clerk shall thereupon record the name of the person incurring the assessment and the amount of the assessment in the County Clerk Lien Record.