Iowa Code § 468.390: United States levees — cooperation of board.

In any case where the United States has built or shall build a levee along or near the bank of a navigable stream forming a part of the boundary of this state, the board of supervisors of any county through which the same may pass shall have the power to aid in procuring the right-of-way for and maintaining said levee, and providing a system of internal drainage made necessary or advisable by the construction thereof. Such improvement shall be presumed to be conducive to the public health, convenience, welfare, or utility.