Mo. Rev. Stat. § 231.250
Upon the adoption of the contract system of working the roads, the township board of the road district so adopting the same shall, on or before the fifteenth day of April, next following such adoption, make an order, duly entered of record, requiring the property tax of such road district assessed for road purposes to be paid in money. The said township board shall immediately give notice of the letting of the working of the roads in such road district by contract, publicly, to the lowest and best bidder, with specifications in such notice of the work to be done; said notice shall be given by at least four written or printed handbills, posted in at least four public places in such road district at least ten days before the letting of such contract. The township board at the time set forth in the notices above provided for shall proceed to let the contract for the working of the roads in said road district to the lowest and best bidder; provided, that no person or persons who are in any wise connected with any member of such township board shall be an eligible bidder. The person or persons whose bid shall be accepted shall, within ten days thereafter, severally enter into bond with the township board in such amount and with such personal security as shall be acceptable to and be approved by said township board, conditioned that they will faithfully perform the conditions and stipulations contained in said contract, and any breach of the conditions of said bond may be sued on in any court of competent jurisdiction in the corporate name of such township.
§ 231.250, RSMo