ORS § 549.370
At least one member of the county court in the fall of each year shall inspect the improvements constructed under the provisions of ORS 549.310 to 549.400, for the purpose of ascertaining whether or not they have been properly maintained and are in a good and serviceable condition. If it is found that the works are not properly maintained or are not in a good and serviceable condition either in whole or in part, the county court shall give notice in writing to the owner of land upon which it was found that the works are not properly maintained or are not in a good and serviceable condition, which notice shall set forth the necessary work to be done and the time of beginning and completion of the same. In the event the owner fails to comply with the conditions set forth in the notice, the county court shall order the necessary work to be done and assess the cost against the land upon which the work was done in the manner provided in ORS 549.350.
ORS 549.370