Iowa Code Title XI. Natural Resources [Chs. 455-485] § 468.579. Lien

When conservator's drainage district bonds are issued under this part, nothing in this part shall be construed as impairing the lien of all unpaid assessments upon the real estate within the drainage district, nor shall this part be construed as impairing the priority of the lien of the unpaid assessments, nor the right, duty, and power of the officer authorized by law, to levy, collect, and apply the proceeds of the assessments, to the payment of outstanding drainage bonds issued in anticipation of the collection of the assessments.