I've long wondered why salmon haven't been introduced to the Colorado River below Lake Powell. The cold, clear water coming out of the lake have messed up the river for the native species, but seems like it might be ideal for salmon.
Why? Pretty much up to your state fish & game and they have to have reasons to justify it primarily economically, but also how it would effect the ecosystem.
There is a reservoir in either North Dakota or South Dakota that is planted with chinook salmon. Oahe?