Army Corps of Engineers, there are about seventy thousand dams in the U.S and two hundred and fifty thousand rivers. Many of those are Hydroelectric dams that generate almost nine percent of the country’s electricity. The U.S. Environmental Protection Agency says that “In the Pacific Northwest alone, hydropower provides about two-thirds of the region's electricity supply.” Hydropower is one of the most renewable resources being used today because it has no impact on air quality, doesn’t produce solid waste, and doesn’t pollute the water being used. What happens is this: a hydroelectric power plant takes the kinetic energy gained by the water flowing downstream and converts it into electricity by forcing the water through a hydraulic turbine connected to a generator. After the water leaves the turbine it returns to a stream or riverbed below the