Iowa Code Title VIII. Transportation [Chs. 306-330B] § 313.60. Indebtedness paid

When all outstanding indebtedness or other obligations against such bridge and approaches thereto have been paid and discharged the department shall accept transfer of title thereof to the state and is thereafter authorized to take possession of, operate and maintain such bridge and approaches, or any part thereof, free of tolls, as a part of the primary road system.