Mo. Rev. Stat. § 70.115
Any county or city in which the Corps of Engineers of the United States Army or any other department or agency of the government of the United States is authorized by congress to construct works for recreational purposes along any river or tributary thereof lying within or adjacent to the city or county may, if in the opinion of the governing body of the county or city the construction is for the public welfare:
(L. 1965 p. 189 § 1)