Jason,
The water in the Hiwassee is cold and clear. I believe that the water is taken from the bottom of the lake above the power house and therefore is the coldest water in the lake. The water in the Hiwassee late in the summer, like now is in the low to mid fifties I believe. The trout do well because of that. There are lots of other places where the water is from the bottom of the lakes, trout holes like Taneycomo in Missouri is very similar and is a great trout fishery in the middle of the summer.