Although I'm in Dallas, North Georgia is like a second home for me. First, there is the Chattahoochee (The Hooch). Then there is Duke's Creek, Smith's Creek, The Ami, etc. - those are generally around Helen, GA. That's just the tip of the list.
. That should be more than enough info. There are lots of web sites and many fly shops - I'm not pushing one over the other. These are just ones that I'm familiar with.
Right now I know that they have been hitting Caddis on the surface at a place called Paces Mill, which is a section of the Hootch down towards Atlanta. Good luck.