Oregon Revised Statutes Public Organizations for Community Service § 266.540

(1) The district board shall ascertain and levy annually, in addition to all other taxes, a direct annual ad valorem tax on all taxable property in the district, which tax shall be outside of and in addition to the annual levy limitation contained in ORS 266.420, and which tax shall be for an amount sufficient:

(2) The funds derived from such tax levies shall be retained by the county treasurer, and kept by the county treasurer in a separate fund to be known as and designated “__________ Park and Recreation District bond interest and sinking fund.” The fund shall be irrevocably pledged to and used solely for the payment of the interest accruing on and the principal of the bonds when due, so long as any of the bonds or the coupons thereto appertaining remain outstanding and unpaid. The interest earnings of the fund shall be credited thereto and become a part thereof.