S.C. Code § 49-29-40
The following types of rivers are eligible for inclusion in the State Scenic Rivers Program:
Natural rivers: those free-flowing rivers or river segments generally inaccessible except by trail or river, with adjacent lands and shorelines essentially undeveloped and its waters essentially unpolluted.
Scenic rivers: those rivers or river segments which are essentially free flowing and possess shorelines largely undeveloped and with limited road access. Adjacent lands are partially or predominantly used for agriculture, silviculture, or other dispersed human activity which does not disturb substantially the natural character of the river corridor.
Recreational rivers: those rivers or river segments accessible by road and that possess development along shorelines and adjacent lands. Included are rivers with developed or partially developed shorelines and adjacent lands for residential, commercial, or industrial purposes, rivers with parallel roads or railroads, and rivers with some impoundments. These rivers or river segments provide outstanding river-related recreational opportunities.
S.C. Code § 49-29-40