ORS § 547.560
The board of supervisors may sell, from time to time, the bonds which have been authorized, in such quantities as may be necessary and most advantageous. Before making any sale, the board shall, at a meeting, by resolution, declare its intention to sell a specified amount of bonds and the day, hour and place of such sale, and shall cause notice thereof to be given by publication for at least 30 days in three newspapers published in Oregon, one of which shall be a newspaper published in the county in which the office of the board is situated, if there is a newspaper published in that county, and in any other newspaper at its discretion. The notice shall state that sealed proposals will be received by the board of supervisors at its office for the purchase of bonds until the day and hour named in the resolution. At the time appointed, the board shall open the proposals and may reject any and all bids. After offering the bonds for sale, if no satisfactory bid is received the board may use them for any purpose for which the proceeds from the sale of bonds may be used, but the board shall in no event sell or dispose of any of said bonds for less than 90 percent of the face value thereof. Nothing in this section shall inhibit the district from providing for the drainage of lands within the district, in units or portions, from time to time.
ORS 547.560