Appropriating money and issuing bonds to construct, operate and maintain joint facilities. Incorporated cities, school districts and counties of this state may jointly, in such manner as they shall agree upon, construct, acquire, own, equip, operate and maintain facilities which will directly aid each participating governmental unit in performing a duty or duties imposed upon it or aid in exercising a power or powers conferred upon it, and may appropriate money and may issue bonds therefor

ORS 280.150 — under Chapter 280.