Oregon Constitution Art. XI § 7

The Legislative Assembly shall not lend the credit of the state nor in any manner create any debt or liabilities which shall singly or in the aggregate with previous debts or liabilities exceed the sum of fifty thousand dollars, except in case of war or to repel invasion or suppress insurrection or to build and maintain permanent roads; and the Legislative Assembly shall not lend the credit of the state nor in any manner create any debts or liabilities to build and maintain permanent roads which shall singly or in the aggregate with previous debts or liabilities incurred for that purpose exceed one percent of the true cash value of all the property of the state taxed on an ad valorem basis; and every contract of indebtedness entered into or assumed by or on behalf of the state in violation of the provisions of this section shall be void and of no effect. This section does not apply to any agreement entered into pursuant to law by the state or any agency thereof for the lease of real property to the state or agency for any period not exceeding 20 years and for a public purpose.