S.C. Code Ann. § 57-19-70

The governing body of any county in which there is a special levy on real and personal property for road purposes shall, not later than the first of March in each year, apportion the road fund derived from such special levy to each township upon an equitable basis, and when the tax is levied only in one township, it shall be expended in that township. The road fund so apportioned shall be expended by the road overseer in doing all necessary work upon the public highways, in opening new roads when directed and in building and keeping in repair all bridges that do not exceed twelve feet in length, subject to the general supervision and approval of the governing body of the county.