Windrock. About 20 miles from Knoxville, TN.
There are about 10 to 15 DH trails, with a vertical drop of 2,200 ft.elevation (although the very top is closed currently, so runs will be from about 1,900 or 2,000ft. vertical drop.)
Plan to hook up your own shuttle, but there are usually several trucks running shuttles on the weekend. You would need to a guide for the first few runs to figure out where to go, but there are plenty of locals willing to show you around for a ride to the top.