Slow-moving Lakes

In the northwest, to make power for our cities, federal dams have "transformed the Snake and Columbia from the world's premier salmon highway to a series of slow-moving lakes separated by huge slabs of concrete." To keep from driving the last of these salmon into extinction, regular monitoring is done and a small amount of water is allowed to flow over or through the dams. Now, one senator wants to throw a monkeywrench in the works.