2013 ORS § 373.280¹
Assessments made by city under belief county road was city street

No assessment made by any city for the improvement of any county road or portion thereof under the bona fide belief of its governing body that it was a public street of the city is invalid where the property owner has permitted the city to make the improvement or where the county has surrendered jurisdiction to the city within the time when the assessment is otherwise collectible by law, if within the time the assessment would be otherwise collectible the city acquires full jurisdiction over the county road or portion thereof as provided in ORS 373.270 (Transferring jurisdiction over county roads within cities).