I wish I could help you here but all I know are a couple of different trails and trailsystems in Columbia itself. Other than that there are the trails in Sumter National Forest near Newberry where Terri Hayes puts on her Ultras. That's off of I-26, not I-77 which is what you need. I am pretty sure there is something near Rock Hill, York, Lancaster area South of Charlotte across the SC border a little into South Carolina near I-77. Try searching in that area. Good Luck.