Thats the trouble with artificial cold water release fisheries. They are controlled to the point of exceptional output for so long that when they receive a natural culling event it appears catastrophic. Its not a long term pollution event, or Didymo,(although I had heard some stink about the beginning stages there). So it received some unusual scour and mud, these are events that occur to natural freestones all the time. The problem will be that in order to clean it up, the Savage will need to be flushed this spring several times to the tune of bankfull events and the Dam will probably not agree to the releases for the sake of other management protocols. Live and die by the sword.