Not sure about re establish would be a term I would use. Whatever the environmental and harvest factors are will through natural selection determine genetics. In this case the areas blocked are mostly protected so things should go the way the article says. In the case of the Chinook not so much as to the return of the huge size. These were 5 / 6 / 7 year fish that are brutalized in the ocean harvest. Dams gone great step forward but it will be many years before we see what the Chinook run will evolve to. Steelhead do not get the marine destruction that other spieices do thank god but they are very vulnerable in the fresh water. What works on the Elwha ( with the watershed protected by the park ) exist in few places in the state.