Here is a better shot of the Mountain Dusky. It is big, but not D. qudramaculatus big. Tail isn't keeled either.

I have found blackbellies with very light coloration on the head (almost golden) around these same streams, but never away from a stream. How far away from water have you seen them? I have seen D. monticola and D. fuscus a good distance, even two-lines, from the nearest creek.
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-Bradley

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