All your blue lines will be flowing strong, and your dry fly fishing won't be very effective. Nymphs and streamers will be the way to go. You may find a hatch of early black stones size 14 ( if you're lucky).
Keep an eye on the TVA website and check out flow patterns for the tailwaters, as this will be the determinant of IF you can fish the tailwaters. Maybe a stray caddis or sulpher?, expect some BWO's 20-22.
Here's a suggestion...Camp (for free) on the Virginia Creeper Trail, Fish for trout on Beaverdam near Damascus, and chase the night time walleyes of S Fork Holston just downstream in Alvarado VA. It's my favorite fishing that time of year--you'll need a VA license.
Check Eddie's shop Fly Shop of TN in Johnson City--423-928-2007
or Bruce Wankle's Virginia Creeper FlyShop in Abingdon, VA