Mo. Rev. Stat. § 154.030: Wharfage charge (cities of 5,000 and less than 50,000).

Any city or corporation having a population exceeding five thousand and less than fifty thousand inhabitants, and having an improved wharf in suitable condition for receiving and discharging freight, may charge and collect two dollars for each and every landing at said wharf; and any city or corporation having a less population than five thousand, and having an improved wharf in good condition, may charge and collect the sum of one dollar and fifty cents for each and every landing of any steamboat or other watercraft at said wharf.