What is the National Inventory of Dams (NID)?
The National Inventory of Dams (NID) is a Congressionally authorized dam safety and management tool, which documents dams in the U.S. and its territories. The NID was reauthorized in Section 215 of the Water Resources Development Act of 1996 (Public Law 104-303). The NID includes dams that are at least 25 feet high, or impound at least 50 acre-feet of water at maximum pool level (as defined in law). The NID is maintained by the U.S. Army Corps of Engineers, in cooperation with the Association of State Dam Safety Officials (ASDSO), the states and territories, and dam owning Federal Agencies.
