I don't know that the ATV riding in Royal Blue, Brimstone, and Sundquist wukk have any effects on the Clinch. The watersheds are completely separate from the Clinch watershed. Big South Fork feeds the Cumberland.
The Clinch is fortunate because it has an extremely small watershed below the dam. There are only 3 tribs, and all of those have very small drainages as well.
On the benthic stuff, I don't spend much time looking for bugs and with John's work I generally yield to his opinion. He has been doing it for a very long time.