The National Inventory of Dams (NID) is now available! With more than 90,000 dams across the United States, the NID is the central information source for dams in the U.S. and its territories. The database contains more than 70 data fields for each dam - find out where dams are, what they were designed to do, and who manages them. The NID is an important resource to assist emergency managers, safety professionals, infrastructure owners, community leaders, business owners, and residents understand the relationship between dams and their surrounding communities.