DBunch,
I am in no way an “authority” on the South Holston, but I do love to fish that river when I get a chance. I haven’t been up there since December, so I don’t know what’s been going on. More than likely, though, the sulphers have started. They usually start hatching around 11:00 and can last on and off for a good 3 to 4 hours, if not most of the day. They range in sizes from 12 to 18 with the most common size being 16, and the bigger ones hatch earlier in the season. Zach’s right, the fish are real spooky in the flat sections when there is no water running, but they’re generally not as picky in the riffles etc.