S.C. Code Ann. § 50-13-1260

Nothing herein contained shall be construed to give authority to the governing bodies of the several counties to designate any fish sluice through any dam erected by public authority for the improvement of the navigation of any of the rivers or to designate any fish sluice through any dam erected by individuals for the purpose of propelling any machinery when the owner of such dam shall leave open a part of the river sixty feet wide or, where the dam extends entirely across the river, shall construct therein a sufficient fish sluice sixty feet wide and shall keep the same open for and during the months of February, March and April in each year.