33 U.S.C. § 467d: National inventory of dams and low-head dams

The Secretary of the Army shall maintain and update information on the inventory of dams and low-head dams in the United States. The inventory maintained under subsection (a) shall include any available information assessing each dam based on inspections completed by a Federal agency, a State dam safety agency, or a Tribal government. the location, ownership, description, current use, condition, height, and length of each low-head dam; any information on public safety conditions at each low-head dam; and any other relevant information concerning low-head dams. coordinate with Federal and State agencies, Tribal governments, and other relevant entities; and use data provided to the Secretary by those agencies and entities. public safety information on the dangers of low-head dams; and a directory of financial and technical assistance resources available to reduce safety hazards and fish passage barriers at low-head dams. Nothing in this section provides authority to the Secretary to carry out an activity, with respect to a low-head dam, that is not explicitly authorized under this section. In this section, the term “low-head dam” means a river-wide artificial barrier that generally spans a stream channel, blocking the waterway and creating a backup of water behind the barrier, with a drop off over the wall of not less than 6 inches and not more than 25 feet.