It's those guys on Wall Street controlling the river!
I think all rivers do that. Look at the Caney. Down now but about 3 years ago you could walk across the river on the backs of big browns! Now the Clinch is picking up again some. Who knows what causes the peaks and valleys. Pressure from fishermen? Weather, generation, etc. All I really know is that I am on call and board that I can't go fishing today!
I am a great admirer of spectator sports, especially on television; it keeps the riffraff off the trout streams.