Amazing hike off the beaten path. I'm not an infrequent hiker and would definitely call this a strenuous hike, if short in distance. It's a little more than a mile, but you are truly climbing the mountain at many points- the ascent is very obvious.
Jones Gap/Mountain Bridge SP is about to take control of this area, and I'm sure the trail will benefit as there were some fallen trees and the like that could have used attending. Overall, amazing trail- very clean because of presumably low traffic, since this trailhead is seperate from the park and a very long hike out from Hospital Rock.
Note that there are only about 3 parking spaces at the trailhead, which is about two miles back some residential roads, past the palmetto bible camp. This is honestly for the best, as it keeps visitor numbers low, which you will appreciate when you get to the falls and have plenty of time to yourself to enjoy the beauty of the towering double cascade coming down the mountain.
TLDR: one of the best waterfalls I've seen in the state, and definitely worth the short hike if you are ready for an intense scramble.