S.C. Code § 57-5-80
The department may transfer from the state highway secondary system any road under its jurisdiction, determined by the department to be of low traffic importance, to one of the parties indicated in this section if mutual consent is reached between the department and the party that the road is being transferred to:
In all cases, the county or municipality shall have right of first refusal to accept roads into their maintenance responsibility when roads are considered for transfer from the state highway system to a nongovernmental entity or person and in no case may a state road be transferred to a nongovernmental entity unless all persons and businesses located on that road are in agreement with the transfer. Maintenance responsibility for roads transferred from the state highway system pursuant to the provisions of this section shall transfer from the jurisdiction of the department to the jurisdiction of the county or municipality, school, governmental agency, nongovernmental entity, or person, effective upon notice from the department of official action removing the road from the state highway system. Notification of the transfer must be given to the county's legislative delegation.
S.C. Code § 57-5-80