When I was in college in PA, we used to fish a trout stream that had a paper mill pump out on it. The water coming out was a dark brown stained color and usually much warmer than the stream temp in the winter. It was actually great fishing for trout where the outflow came into the stream. I guess the trout liked the warmer water along with the baitfish. So did every carp and rock bass in the area too. Made for some great winter fishing.
