Information from the National Atlas of the United States, dated 2006.[1]:

The National Inventory of Dams (NID) is a collection of information about dams in the United States and its territories, produced by the U.S. Army Corps of Engineers (USACE). The USACE works closely with the Association of State Dam Safety Officials (ASDSO), the Federal Emergency Management Agency, and other State and Federal agencies to update and publish the NID. The National Inventory of Dams contains more than 79,000 dams, provided voluntarily by a wide variety of agencies. This information is used to track information on the country's water control infrastructure and to allocate Federal resources for dam safety programs.

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."

Projection: "+proj=aea +lon_0=110w +lat_1=36N +lat_2=49 +datum=WGS84 +ellips=WGS84"

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