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

(a) In general: The Secretary of the Army must maintain and update information about the inventory of dams and low-head dams in the United States. (b) Dams: This inventory must include any available information assessing each dam, based on inspections done by a federal agency, a state dam safety agency, or a tribal government. (c) Low-head dams: For low-head dams, the inventory must include (1) each dam's location, ownership, description, current use, condition, height, and length; (2) any information about public-safety conditions at each low-head dam; and (3) any other relevant information about low-head dams. (d) Data: To carry this out, the Secretary must (1) coordinate with federal and state agencies, tribal governments, and other relevant groups, and (2) use the data those agencies and groups provide. (e) Public availability: The Secretary must make this inventory public, including on a public website, along with (1) public-safety information about the dangers of low-head dams, and (2) a directory of financial and technical help available to reduce safety hazards and fish-passage barriers at low-head dams. (f) Clarification: This section gives the Secretary no authority to do anything about a low-head dam beyond what this section explicitly allows. (g) Low-head dam defined: A "low-head dam" is an artificial barrier that spans most of a stream channel, blocks the waterway, and backs up water behind it, with a drop of at least 6 inches and no more than 25 feet over the wall.