Iowa Code § 308.2
The general assembly of the state of Iowa hereby declares that the intent of this chapter is to assent to any Act of the United States Congress authorizing the development of any national parkway located wholly or partly within the state of Iowa, to the full extent that is necessary to secure any benefits under such Act, provided that the hunting of migratory game birds and other game and fishing shall not be prohibited or otherwise restricted by the United States government or any of its designated agencies in control of said project, and to authorize the appropriate state boards, commissions, departments and the governing bodies of counties, cities and villages and especially the state transportation commission to cooperate in the planning and development of all national parkways that may be proposed for development in Iowa, with any agency or department of the government of the United States in which is vested the necessary authority to construct or otherwise develop such national parkways. Whenever authority shall exist for the planning and development of any national parkway, of which any portion shall be located in the state of Iowa, it shall be the duty of the state transportation commission to make such investigations and studies in cooperation with the appropriate federal agency, and such state boards, commissions, and departments as shall have an interest in such parkway development, to the extent that shall be desirable and necessary in order to provide that the state shall secure all advantages that may accrue through such parkway development and that the interests of the counties, cities, and villages along the route shall be served.
Iowa Code § 308.2
98 Acts, ch 1199, §1, 27; 98 Acts, ch 1223, §30