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Rivers & Streams. There are over 3.5 million miles of rivers and streams in the U.S., covering an enormous and diverse landscape. Rivers supply our drinking water; irrigate our crops; power our cities with hydroelectricity; support fish and other aquatic species; and provide countless recreational and commercial opportunities. Small streams (such as headwater streams) and their associated wetlands are equally important.
A dam can also be used to collect water or for storage of water which can be evenly distributed between locations. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees (also known as dikes) are used to manage or prevent water flow into specific land regions.