S.C. Code Ann. § 3-5-350

In such condemnation proceedings the uses for which such land or property is condemned are hereby declared to be for a purpose paramount to all other public uses and the fact that any portion thereof has theretofore been condemned by a railroad company, canal company, telephone or telegraph company or other public service corporation or by any political subdivision of the State for public uses or has been conveyed by any person for any such public uses shall in no way affect the right of the State or the United States Government to condemn such lands and property as herein provided.