Iowa Code § 461A.18: Jurisdiction.

Jurisdiction over all meandered streams and lakes of this state and of state lands bordering thereon, not now used by some other state body for state purposes, is conferred upon the commission. The exercise of this jurisdiction is subject to the approval of the department in matters relating to or in any manner affecting flood control. The commission, with the approval of the executive council, may establish parts of the property into state parks, and when so established all of the provisions of this chapter relative to public parks apply to the property.