I heard a rumor about some brook trout in PA that were more warm water tolerant but was never able to track it down.
Never heard about it myself... I'll check around and see though...
Here are some photos from Friday of the "trout creek". You can see it looks very different in the fall! Much much lower water level, to the point where it barely runs, leaves all over the surface and a brown rather an a nice aqua blue color.
Spring time:
