Thought on return timing. I know entry and movement is tied to flows. But, since return timing is inherited to some extent the old idea that if you don't kill them they will spawn enters in. The coho fishery is pretty intense and not many of those who enter and move then spawn. So, over the generations the return time shifts. I do know that in Puget Sound, especially South Sound with the intense harvest directed at hatchery coho, that good numbers enter streams in January and even a tad later.

Another little bit about flows. The fish are definitely getting smaller. They need less water. Not to say the current flows aren't, as Rivrguy says, ugly, but imagine how many more coho would be piling up 30 years ago.