Missouri Revised Statutes Title XIV. Roads and Waterways § 231.300. County commission may appropriate money, when

Whenever the citizens along the line of any public road in a district subscribe any sum not less than twenty-five dollars for grading, graveling or otherwise improving any portion of such road, and shall deposit the same with the township treasurer, the county commission may appropriate a like amount for such purpose out of any funds of the county not otherwise appropriated.