Federal wildlife officials have concluded that killer whales are threatened by California's massive network of dams and water diversions, a development that could bring a massive shift in public opinion about the state's water issues. Though the iconic orca never ventures into freshwater, its primary food source does. Salmon species in the Central Valley are in bad shape, in large part due to the damming and diversion of their habitat on numerous rivers in California's interior. Their decline threatens to starve the dwindling southern resident population of killer whale, which numbers less than 90 animals. As a result, the National...