Enforcement of assessment lien. (1) In case the whole or any portion of the cost of an improvement is assessed against the property directly benefited and the owner of the property fails to pay the amount of the lien, or any portion thereof, or the interest thereon, when they become due, the board may proceed to foreclose the lien in any manner provided by law for the collection of liens by municipalities and may provide by ordinance a general procedure for the collection of liens in any manner not inconsistent with law

ORS 264.394 — under Chapter 264.