From Downtown Charleston: Take Us 17 North From Charleston To Hwy. 41 West. Drive 2.9 Miles On Hwy. 41. Turn Right On Harpers Ferry To The Security Gate And Follow Your Gps From The Airport: Take I-526E Towards Mt. Pleasant. Travel 13 Miles To Exit 29B (Clements Ferry Rd.), Drive 4.5 Miles On Clements Ferry Rd. To Hwy 41 For About 3 Miles And Turn Left Onto On Harpers Ferry To The Security Gate