OK, no more cig jokes.........
Personally I think it is the generation schedules on the Clinch that hurts.
S. Holston has much less inflow and therefore less outflow as the Clinch. It's not uncommon for a one hour pulse on the S. Holston to maintain minimal flow and DO. It is however UNCOMMON on the Clich for anything less than 8 or more hours of 6-7K CFS flow, everyday, secondary to the massive amount of drainage areas the two rivers behind Norris control, especially in a normal to wet season. My two cents on why reproduction/spawing to adult natives is sparse at best.
I am a great admirer of spectator sports, especially on television; it keeps the riffraff off the trout streams.