S.C. Code Ann. § 50-21-148

It is unlawful to obstruct any pier, dock, wharf, boat ramp, or the access area to the facilities. Any vessel, vehicle, or other object left unattended which obstructs any of the facilities or the access to them may be removed entirely at the risk and expense of the owner. The department, with the advice of the Department of Transportation, shall erect signs at appropriate locations advertising the provisions of this section. Any person violating the provisions of this section is guilty of a misdemeanor and upon conviction must be fined not less than twenty-five dollars nor more than one hundred dollars or imprisoned for not more than thirty days.