I have seen this pop up before. Is it a park or club that rides on private land?
It's not really clear from their Facebook page (
http://www.facebook.com/JocasseeGorgesOffRoadClub), but it looks to me like a park, open to the public. They seem to post whenever they're going to be open on a weekend, with hours of 9:00 to 4:00 on Sat and Sun, but it also looks like they've been closed a lot after it rains. Someone mentioned concerns about silting up the neighbor's pond and tracking mud onto the public road. There are references to charging $20/rig. Looks like they also allow ATVs, but no dirt bikes. You have to read through all the posts to figure all that out.
They list a phone number if anybody wants to call them up: (864) 324-9690. Address is listed as 259 Sunset Community Road, Pickens, South Carolina.