There are a lot of people smarter than me on this issue, but my gut feeling is exactly what Goeduck stated above.

I grew up near Chimacum Creek in Port Townsend Bay, and saw how habitat loss effects a small stream first hand. Chimacum Creek is an example of an area where the local, State, Private and Federal sectors have all responded with a goal to restore habitat, and slowly the fish population has grown. Then when the ocean conditions improved, the runs really made progress.

I think of this as a window of opportunity, and we have to do all we can while the ocean survival rate is strong. Unfortunatly, some streams are not worth putting the money into, as they are way too far gone.