Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 545.577

(1) All persons interested in any lands within the district shall be charged with notice of all proceedings at the hearing and proceedings subsequent to the hearing. Any person or landowner aggrieved by the action of the board of directors may within 30 days from the entry of the resolution appeal to the circuit court of the county in which the lands of the district are situated. If the district is situated in two or more counties and an appeal is taken to the circuit court of each county, then all appeals shall be consolidated in one action. If the counties are situated in more than one judicial district, the presiding judge of the Court of Appeals shall determine the judicial district in which the appeal shall be tried. The appeals shall be taken by giving a notice in writing and leaving a true copy of the notice with the secretary of the irrigation district.

(2) Upon the expiration of the time for service and filing of notices of appeal to the circuit court, if no appeal is taken from the resolution of the board, the resolution becomes final. If an appeal is taken, the circuit judge of the county in which the appeal is to be heard shall make an order directing the trial court administrator to have published once a week for four consecutive weeks in each county in which the lands in the district are situated, a notice and summons reading substantially as follows:

(3) The date required for appearance in the cause shall be a date to be fixed by the court, adjudged reasonable, and not less than 30 days from the date of the first publication of the notice. The proceeding shall be a proceeding in rem. All persons owning or claiming any interest in lands in the irrigation district shall appear and show cause why the assessment or determination of benefits should not be ratified and approved, and shall be bound by all subsequent judgments and orders made in the cause, without further notice.