associated with the infrastructure. The National Inventory of Dams (NID) and the National Levee Database (NLD) were established to provide information about dams and levees in the country. The next sections describe those inventories and information in them about dam and levee physical infrastructure and ownership.
National Inventory of Dams
The National Dam Inspection Act of 1972,3 passed after the failure of multiple dams, required the U.S. Army Corps of Engineers (USACE) to create the NID. The first version of the NID was delivered in 1975, and is generally updated on a 2-year cycle (the last update was in 2009).4 Since 1975, the NID has been managed by USACE or the Federal