Oregon Revised Statutes Public Organizations for Community Service § 261.360

(1) When authorized by a majority of its electors voting at any primary election or general election or at a special election, at which special election not less than 25 percent of the electors of the district voted on the question, any district may issue and sell general obligation bonds so conditioned that the district shall therein and thereby unconditionally undertake, promise and agree to pay the same in whole or in part from revenue or from taxes or both.

(2) The general obligation bonds of the district outstanding at any time shall not exceed two and one-half percent (0.025) of the real market value of all taxable property within the limits of the district.

(3) General obligation bonds may be made payable primarily from and secured by a lien on and pledge of the revenues derived by the district from its operations remaining after paying from such revenues all expenses of operation and maintenance, and secondarily from taxes.