The Cowlitz winter steelhead are later than the Chambers Ck, but as production of Cowlitz late winters ramped up, more of them returned in Dec. and Jan., with the majority returning Feb. into Apr. The interesting point to me though is more wild steelhead returned than hatchery fish, even though the number of hatchery smolts is about an order of magnitude greater. There's a story in there, but I'm not quite sure what it is.