S.C. Code § 50-13-1240
It shall be the duty of the governing body of the county to designate the fish sluices on the several rivers so as to leave one or more passages for fish up such rivers. Such sluices shall be sixty feet wide or, where there are two or more such sluices, they shall be, together, sixty feet wide. When they shall be so designated, it shall be lawful for any person to open such sluices. If any person shall obstruct any such sluice, when once opened, so as to prevent the free passage of fish up such sluice, and every part thereof, he shall be guilty of a public nuisance and, on conviction thereof in the court of general sessions, shall be fined one hundred dollars and shall stand committed until such fine be paid for a time not exceeding ten days, at the discretion of the court before which such conviction may take place. Whenever a fish sluice in any of such rivers shall have been designated as provided in this section, any stoppage of such sluice shall be regarded as a public nuisance and may be abated as such.
S.C. Code § 50-13-1240