I fished no further than 2 miles down from the upper entrance. A habit developed when the road was blown out by a flood several years ago forcing fishermen to park and walk before repairs were made. It seems many of the questionable fishermen concentrate on the deep holes known to hold trout and keep 'em pretty spooked up. Try throwing a wooly booger through some of the flatter waters. Keep your eyes open for trout moving or following your fly, revealing their position.
I got a nephew in Cosby, Doug Stuart.