Anyone ever notice that nasty sulfur smell up river near 60 and into the Hiwassee? That's sulfur dioxide from fossil fuels. It can also leak into waterways from volcanic activity and industry. I remember a few years ago I saw on the news, there was a toxic sulfur dioxide leak up the Hiwassee near the I 75 bridge area and, it was fortunate there were no boaters or fishermen in the area at the time. When there is sulfur dioxide in the air (fumes), even at low to moderate levels, and it rains, you guessed it- Acid Rain. Which lowers the ph levels in the water and stunts plant growth. I have no evidence of this as a cause but it makes sense. I doubt that spraying localized areas with herbicide can flatten an entire lake like we saw last year. But, Add together other sources like zebra muscles, phosforous contamination from ferilizers, poultry and hog farms, herbicides and sulfur---Where is the TWRA on this. Haven't heard any input from them. Shouldn't someone be testing the water? I hope I'm wrong but, I think we're in for a long term issue!