2.9 miles up Knopki Creek Road an unmarked Trail goes down to Middle Fork Falls. The falls plunge 35 feet off a serpentinite cliff into an extremely deep pool on the Middle Fork of the Smith River. The view is well worth while if you're already here.
The trail head can be very difficult to find. It comes just a few hundred yards after the third bridge, at the end of a large road embankment on the right (south). The hike is short and steep, the final hundred feet or so is a steep scramble on slick moss-covered rock complete with fixed ropes.
The entire detour only takes a matter of minutes if already traveling on Knopki Creek Road and only slightly longer adding in driving time from Highway 199. Directions to Knopki Creek Road are located here.