Mo. Rev. Stat. § 241.320

In surveying the lands and islands referred to in sections 241.290 to 241.340 the surveyor shall connect the survey thereof with some established section, quarter section, meander or other United States survey corner conveniently near or adjacent to the land or island to be surveyed; he shall meander islands and such lake and riverbed lands as may abut on a navigable river or lake; he shall subdivide such lands into sections and quarter sections by producing and extending the lines of the surveys made by the United States surveyors over such islands and lands from the shore from which said islands or lands may be surveyed.