Mo. Rev. Stat. § 12.100: County commission to use funds in maintaining schools and roads.

The county commission of each county receiving any such moneys shall use the funds to aid in maintaining the schools and roads and for defraying any of the expenses of the county in accordance with the provisions set forth in sections 12.070 and 12.080. The county commission shall allow to the school districts and for roads an amount based upon their respective levies equal to that which would ordinarily be allowed to them out of taxes from property owned by the United States if the property were privately owned before using any of the moneys for defraying other expenses of the county.