Iowa Code § 306C.5
When the department determines that it is in the best interests of the state, it may acquire by gift, purchase, exchange, or condemnation, as provided by law, such property or rights or interests in property as may be necessary to provide adequate screening for junkyards. When the department determines that the topography of the land adjoining the highway will not permit adequate screening, or screening would not be economically feasible, the department may acquire such property or rights or interests in property as may be necessary to secure the relocation, removal, or disposal of the junkyard, and shall pay the cost of such relocation, removal, or disposal, with federal participation. However, no plan for relocation, removal, or disposal which qualifies for federal participation shall be undertaken unless the department has received notification from the federal government that the federal share to be paid is immediately available for that purpose.
Iowa Code § 306C.5