Mo. Rev. Stat. § 65.690
1. Any township board which appointed a township planning or township zoning commission and which has adopted a zoning plan, as provided in sections 65.650 to 65.700, shall appoint a township board of zoning adjustment. The board shall consist of five freeholders, not more than one of whom may be a member of the township planning commission or the township zoning commission. The membership of the first board appointed shall serve respectively: one for one year, one for two years, one for three years, two for four years. Thereafter, members shall be appointed for terms of four years each. Members shall be removable for cause by the township board upon written charges and after public hearings. Vacancies shall be filled by the township board for the unexpired term of any member whose term becomes vacant. Members of the board shall serve without compensation, but may be reimbursed for expenses incurred for attendance at not more than four meetings per year in an amount to be set by the township board, not to exceed ten dollars per meeting. The board of zoning adjustment shall elect its own chairman and shall adopt rules of procedure consistent with the provisions of the zoning regulations and the provisions of sections 65.650 to 65.700. The chairman, or in his absence the acting chairman, may administer oaths and compel the attendance of witnesses. All meetings of the board of zoning adjustment shall be open to the public, and minutes shall be kept of all proceedings and official actions, which minutes shall be filed in the office of the board and shall be a public record. Appeals to the board of zoning adjustment may be taken by any owner, lessee or tenant of land, or by a public officer, department, board or bureau, affected by any decision of the administrative officer in administering a township zoning rule. Such appeals shall be taken within a period of not more than three months, and in the manner provided by the rules stay all proceedings in furtherance of the action appealed from, unless the officer from whom the appeal is taken shall certify to the board that by reason of facts stated in the certificate a stay would, in his opinion, cause imminent peril to life or property. The board of adjustment shall have the following powers and it shall be its duty:
(L. 1989 S.B. 11 § 16)