Iowa Code § 310.2: Supervisors agreement.

The county board of supervisors of any county is empowered, on behalf of the county, to enter into any arrangement or agreement with or required by the duly constituted federal or state authorities in order to secure the full cooperation of the government of the United States and of the state of Iowa, and the benefit of all present and future federal or state allotments in aid of secondary road construction, reconstruction or improvement.