Farming in Washington state relies heavily on irrigation, flood control, transportation and other benefits from dams on the Columbia and Snake rivers. But activists have claimed that those dams are the main problem harming endangered salmon in those streams, and they want the dams to be taken down. A major new study from a leading salmon researcher, Dr. David Welch, shows that dams are not the obvious culprit in the ongoing decline of Chinook salmon. Dr. Welch joins Dillon to explain the findings and share evidence pointing to where the real problems harming salmon are occurring.