When a top Interior Department official acknowledged recently that the Trump administration wouldn’t try to block removal of four hydroelectric dams on the Klamath River, he signaled a monumental victory for local Native American tribes, salmon fishermen and the national dam removal movement. Yet this development is less momentous than it would have been in 2015, when dam removal was just one component of a broad plan for the Klamath Basin, which straddles the California-Oregon border.