Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 541.040

Every corporation having constructed a ditch, canal or flume under the provisions of the Act of 1891, pages 52 to 60, Oregon Laws 1891, shall erect and keep in good repair a headgate at the head of its ditch, canal or flume, which, together with the necessary embankments, shall be of sufficient height and strength to control the water at all ordinary stages. The framework of the headgate shall be of timber not less than four inches square, and the bottom, sides and gate shall be of plank not less than two inches in thickness.