Iowa Code § 1.5

The state of Iowa hereby consents that the government of the United States may in any manner acquire in this state such areas of land or water or of land and water as said government may deem necessary for the establishment of the “Upper Mississippi River National Wildlife and Fish Refuge” in accordance with the Act of Congress, approved June 7, 1924, [16 U.S.C. ch 8] provided the states of Illinois, Wisconsin, and Minnesota grant a like consent.