CF, the Cowlitz is not a river any more that steelhead can reproduce in - it's a series of slack water impoundments upstream of a diked ditch with huge aquaculture facilities on it. Of course the wild fish disappeared - all of their habitat is gone.

Now the Quillayute system has large steelhead production facilities, but it also has intact habitat. The hatchery fish are distinct from the wild fish as the brats are all bred to spawn out by January and the wild fish never even think about it before March. This was by design and seems to have worked pretty well. As long as hatchery steelhead stocks are kept temorally seperated from wild stocks by spawning time - and of course as long as wild fish are released to hold up their end of the deal - I see no problem with wild fish disappearing.