JoeFred--At least a few of the nameless streams hold trout. Of course they are, like the named example I mentioned in a previous post, tiny and pretty close to meaningless when it comes to fishing. Still, folks like the amazing Bobby Kilby, who is still busy adding streams to his list, find them interesting.
Another intersting aspect of this is that there are some larger streams, or at least portions of them, which hold few if any fish. The Park fisheries biologists could help with this more than me, but one example which comes to mind from the past is Alum Cave Bluffs Creek. The flood there in 1951 left it completely fishless for many years, and it is basically marginal to the present thanks to high acidity. Jim Casada