This waterfall is deep in the woods at Ricketts Glen state park in northeastern Pennsylvania. It is forty five feet high and empties into a wide round pool that hikers often swim in. If you look carefully, the trail goes across the upper left of the frame on the way down to here.
Ricketts has been called the crown jewel of the Pennsylvania state park system, and the 26 named waterfalls along with old growth timber areas give a good reason why. There are also numerous unnamed falls there too because it's a land of nothing but forest and running water. It is a long and scenic hike and very steep in places, but the trails are very good. You should be in reasonable shape and have good hiking shoes to go there.