The Major Dams of the United States map layer is a subset of the 2005 National Inventory of Dams, extracted by the National Atlas of the United States®. It lists and describes more than 8,100 major dams in the United States, Puerto Rico, and the U.S. Virgin Islands. Major dams include dams 50 feet or more in height, dams with a normal storage capacity of 5,000 acre-feet or more, and dams with a maximum storage capacity of 25,000 acre-feet or more. Descriptive information includes the dam name and location, the risk level associated with the dam, the purposes for which the dam was constructed, and the dam type.
Download the U.S. Dams and Associated Risk Level Shapefiles
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