Gotta be a steelhead. I noticed on the COE fish counts site that there's a bunch of steelhead going over Lower Granite Dam. Apperently they're fish that have overwintered before moving up again in the Spring. Who knows, maybe it overwintered above Wanapum?
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"Never argue with an idiot. They'll just drag you down to their level, then beat you with experience."
-Dilbert