If you can stick to fishing high up in rivers with good snowmelt/glaciers then you should be fine (although it is good to play it safe and check temps). Or if the river you fish has a dam on it with a large lake to keep it cool. Other than that many of the rivers are getting quite warm.
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They say that the man that gets a Ph.D. is the smart one. But I think that the man that learns how to get paid to fish is the smarter one.