Mo. Rev. Stat. § 60.657
60.657 Plat not required to be filed, when.
60.657. Plat not required to be filed, when. — A survey plat is not required to be filed when:
(1) It is of a preliminary nature illustrating ideas and intentions and not the results of a survey;
(2) It has been recorded under any other provision of law.
(L. 1990 S.B. 580)