Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 545.663

The procedure in the circuit court under ORS 545.651, 545.655 and 545.659 shall be in the nature of an equitable proceeding in rem. Any owner or holder of evidences of indebtedness affected by the court proceeding or any other interested party may appeal to the Court of Appeals at any time within 30 days after issuance of the judgment of the circuit court. The appeal must be heard and determined within three months from the time of taking the appeal. The court, in inquiring into the regularity, legality or correctness of the proceedings, shall disregard any error, irregularity or omission that does not affect the substantial rights of the parties. The Court of Appeals may approve the proceedings in part and disapprove the remainder. The costs of the proceedings may be allowed and apportioned between the parties in the discretion of the court.