Deepest man-made lakes in the United States were not created by nature but by engineering on an enormous scale. Before these reservoirs existed, many were steep river valleys and rugged canyons carved over thousands of years. During the 20th century, massive dams blocked flowing rivers, allowing water to fill these landscapes and form deep reservoirs that now provide drinking water, generate hydroelectric power and help control flooding. Many have also become popular destinations for boating, fishing, camping and other outdoor recreation, attracting millions of visitors every year.
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