Cumberland, Martins Fork - Cumberland Gap National Historical Park to route 987 (1.6 miles) (KY)
This is the biggest and best rapid on the whole creek, and has classic written all over it. The creek bundles up energy on a left to right line, berthing a few 3 foot drops before bottling up and driving off a 7 foot boof through a narrow slot into a boiling room where half the water breaks left into a crazy eddy, and the other half breaks right into a narrow slot that raises up and then drops over a 15 foot vertical slot falls that lands in a big pool. You could catch the eddy, but I would think the less time in that boily place the better. Be prepared for little boof opportunity on the big final plunge, and expect some downtime and or hole surfing. It is plenty deep though, and I think the key to the rapid is a solid entrance boof, followed by a stable and momentum conserving landing. In the pool below, the side trib you crossed on the hike in joins the river, and the creek gains volume.