Oregon Revised Statutes Public Borrowing § 289.225

(a) Be payable from nor charged upon any funds other than the revenue pledged to the payment thereof, nor shall the state be subject to any liability thereon. No holder or holders of such bonds shall ever have the right to compel any exercise of the taxing power of the state to pay any such bonds or the interest thereon, nor to enforce payment thereof against any property of the state except those projects or portions thereof, mortgaged or otherwise encumbered under the provisions and for the purposes of this chapter.

(b) Constitute a charge, lien or encumbrance, legal or equitable, upon any property of the state, except those eligible projects, or portions thereof, mortgaged or otherwise encumbered, under the provisions and for the purposes of this chapter.