Mo. Rev. Stat. § 226.350
This state directly or indirectly from or through its political subdivisions, shall acquire and convey to the United States the necessary areas in fee simple, together with landscape, sightly, safety or scenic easements, and rights-of-way for connections to the approaches of trans-Mississippi River bridges; subject to such flowage, revetment, bank protection, levee or other river control, harbor line and navigation reservations or rights as the Secretary of War* may determine are essential for navigation or flood control purposes. The titles and evidences of titles to such areas so acquired, for protection to the United States in case of use or occupancy thereof, shall be satisfactory to the secretary. Deeds shall be accompanied by land maps, survey notes and closure sheets. This state, through its highway department or its respective political subdivisions, is hereby authorized to construct, relocate or abandon any local, public or service road, crossing or parallel to the parkway road on parkway land, when requested by the secretary.
§ 226.350, RSMo