Oregon Revised Statutes Mineral Resources § 523.290

After passage of the assessment ordinance by the district board, the secretary shall enter in the docket of district liens a statement of the amounts assessed upon each particular lot, parcel of land or portion thereof, together with a description of the improvement, the name of the owners and the date of the assessment ordinance. Upon such entry in the lien docket, the amount so entered shall become a lien upon the respective lots, parcels of land or portions thereof, which have been assessed for such improvement. All assessment liens of a district shall be superior and prior to all other liens or encumbrances on property insofar as the laws of the state permit. Interest shall be charged at the rate of six percent per annum until paid on all amounts not paid within 30 days from the date of an assessment ordinance. After expiration of 30 days following the date of an assessment ordinance the district may proceed to foreclose or enforce collection of the assessment liens in the amount provided by the general law of the state. However, the district may, at its option, enter a bid for the property being offered at a foreclosure sale, which bid shall be prior to all bids except those made by persons who would be entitled under the laws of the state to redeem the property.