Mo. Rev. Stat. § 245.330
The action taken by the county commission in reorganizing an old district under sections 245.285 to 245.545, when such organization shall have been ordered under the provisions of sections 245.285 to 245.545, shall have in all ways and respects the same force and effect in law, as would the organization of a new district under the provisions of said sections 245.300 and 245.335, and the new district thus formed from the old one which existed under a different, general, local or special law, shall thereafter have all of the rights, privileges and immunities, and shall be authorized to exercise the same powers as would any new district originally organized under sections 245.285 to 245.545; provided, that such district changing its organization under the provisions of sections 245.285 to 245.545, shall take up the work of building, maintaining and repairing levees, and other similar improvements, where the old organization stopped; and provided, that the procedure of the new district thus formed shall after its organization proceed in conformity with the provisions of sections 245.285 to 245.545 as to work and acts thereafter to be done by the new district.
§ 245.330, RSMo