Mo. Rev. Stat. § 96.280

It shall be the duty of said board to keep a record of its proceedings and its receipts, expenditures and operations, and to annually render a full and complete itemized report, stating the condition of their trust, together with such other matters as they may deem of general interest to the mayor and common council of said cities; provided said board shall render reports concerning receipts, expenditures, operations, etc., whenever called for by the common council of said cities.