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This legislation authorized the U.S. Army Corps of Engineers (USACE) to maintain and periodically update the National Inventory of Dams, and appropriated funds for that purpose. This GIS coverage was created by extracting dams from the 75,187 dams cataloged in the U.S. Army Corps of Engineers National Inventory of Dams. NID coverage currentness is October 2000.The coordinate system is UTM Zone 17 (NAD 83). 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