Oregon Revised Statutes Highways, Roads, Bridges and Ferries § 371.500

(1) The board of directors, in each fiscal year, shall make a computation of the total amount of money to be raised by the district through assessments for the ensuing fiscal year of July 1 to June 30, next following, for any and all purposes whatsoever in carrying out the provisions of ORS 371.405 to 371.535, including estimated delinquencies on assessments. This amount of money, when determined by the board of directors, shall be and constitute an assessment upon all the taxable property in the district and shall be apportioned by the board of directors to the property owned or held by each person, firm or corporation in proportion to the assessed valuation of all taxable property in the district as determined by the assessment roll of the county assessor last prepared.

(2) The assessment shall not exceed one-fourth of one percent (0.0025) of the real market value of the property, computed in accordance with ORS 308.207, unless authorized by a majority of those voting upon the proposition at a regular or special district election, but by such election no assessment in excess of one-fourth of one percent of the real market value of any property, over and above the one-fourth of one percent assessment above referred to, shall be levied in any one year.

(3) The levy of any tax under this section, ORS 371.505 or 371.515 shall not interfere with or prevent the county court from levying any tax for road purposes it may have the authority and power to do under any other law.