Oregon Revised Statutes Water Resources: Irrigation, Drainage, Flood Control, Reclamation § 545.473

Upon approval by the board of directors, an irrigation district that provides for collection of operation and maintenance charges by the secretary of the board in accordance with ORS 545.471, and that has outstanding operation and maintenance warrants that have been issued for more than one year, may levy a charge not to exceed 20 percent of the annual rates fixed for operation and maintenance. The charge shall be levied and collected for the purpose of retiring outstanding operation and maintenance warrants of the district.