Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 547.415

If the owner or occupant of the premises upon which the clogged or obstructed ditch, lateral, drain, canal, slough, waterway or conduit is situated fails for 10 days after being notified of the existence of such clogged or obstructed condition, to repair, clean or grade the ditch, lateral, drain, canal, slough, waterway or conduit or remove the obstruction therefrom, the board of supervisors shall immediately repair, clean or grade the same and cause it to be promptly placed in a proper and efficient condition.