Or. Rev. Stat. § 286A.102
(5) When property subject to a pledge is acquired by the State of Oregon after the pledge is made:
(6)
(b) If the State Treasurer or related agency reserves the right described in paragraph (a) of this subsection, subject to the terms of the operative document that created the previous pledge, the lien of the subsequent pledge may be on a parity or pari passu basis with the lien of the previous pledge, on a prior and superior basis with the lien of the previous pledge or on a subordinate basis with the lien of the previous pledge, as specified in the operative document creating the subsequent pledge. The lien of the subsequent pledge:
(10) If authorized by law other than this section to set rates, fees or other charges that are pledged to pay obligations, a state agency may enter into rate covenants. Rate covenants authorized by this subsection may obligate a state agency to periodically set the rates and charges:
(d) In accordance with a formula established in the operative document governing obligations. The formula may provide for rates to be determined by reference to factors including, but not limited to:
[2007 c.783 §18]