ORS § 223.420
The reassessment when made shall become a charge upon the property upon which it is laid notwithstanding the omission, failure or neglect of any officer, body or person to comply with the provisions of the charter or law connected with or relating to the local improvement and original estimated or final assessment or any previous reassessment, and although the proceedings of the governing body or the acts of any officer, contractor or other person connected with the local improvement or assessment may have been irregular or defective, whether such irregularity or defect was jurisdictional or otherwise. The reassessment shall not be made in case of any local improvement wherein a remonstrance sufficient in law to defeat it has been duly filed prior to the making of the local improvement.
ORS 223.420