By volume, the Columbia is the fourth-largest river in the United States; it has the greatest flow of any North American river draining into the Pacific. The river's heavy flow and its relatively steep gradient gives it tremendous potential for the generation of electricity. The 14 hydroelectric dams on the Columbia's main stem and many more on its tributaries produce more hydroelectric power than those of any other North American river.
Columbia River in SupervolcanoEdit
After the Yellowstone Supervolcano eruption, Los Angeles still had fairly reliable electricity until all the ash and other debris filled the Columbia River and damaged the various hydro-electric turbines. This resulted in rolling black-outs with L.A. having power for only a few hours a day, a few days a week.