Interesting point. The only native fish(s) that would have existed in Sprague might have been Squawfish, suckers, and well that is it. There were never trout; it lacked spawning and previous connection to rivers or ocean.
It is equally true that most of our lakes were that way, and would be that way now. There were no Bass, no Walleye, no perch, no crappie, no bluegill, no silvers, no lakers, no .......... not even tench and carp.
In the interest of making our bodies of water more productive, earlier and more thoughtful fisheries managers introduced these species. Sometimes the introductions were made by bucket biologist.
Sure, in some cases, west slope cutts were replaced by rainbow (that is correct, these were not native either); bull trout were killed off (do you older guys and guys remember when Bull Trout were tossed on the shore because they were not desirable?)
Nevertheless, if our specialist in fisheries managers had their way, our waters would be barren. Yes, I fear I am correct, even rainbows and browns and silvers would not be planted, because they are NOT NATIVE.
I once read that it was Benjamin Franklin that said something like "common sense is not so common anymore". I fear that if that is true, Old Ben is rolling over in his grave today. LOL