One thing to keep in mind before worrying too much about the predictions for how global warming will affect fish is that there is a LOT of uncertainty in models they use to predict the future changes to climate and precipitation.

I've done modeling of aquatic systems when I was in school and know first hand how much our models require human judgement to predict interrelationships as a model input. In reality, we cannot know all the feedbacks and interrelationships. I do not give a lot of credence to these predictions that sound so certain.

It is likely that there will be some major changes that we can't even predict or imagine. It's crazy to say that anyone knows we (the Pacific Northwest) will be warmer and wetter, warmer and drier, etc.

That said, we know that we've lost snowpack in the Olympics by some 40% in the last 40 years. That's a dramatic change and I would suggest that we should plan for another 40% reduction in snowpack. If it doesn't happen, then we have plenty of water. If it happens and we don't plan for it, then we are up a creek... a dry creek, without need for a paddle.