The term is short for a state’s list of impaired and threatened waters (e.g. stream/river segments, lakes). States are required to submit their list for EPA approval […]

Section 4(d) of the federal Endangered Species Act (ESA) directs the US Fish and Wildlife Service to issue regulations deemed “necessary and advisable to provide for […]

The part of the valley edge against which a dam is constructed. An artificial abutment is sometimes constructed where there is no suitable natural abutment. Right […]

A system of management practices based on clearly identified timeframes and outcomes with monitoring to determine if management actions are meeting outcomes, and, if they are […]

Forced air systems used to re-aerate water released downstream of a powerhouse.

A buttress dam in which the upstream part is a relatively thin flat slab usually made of reinforced concrete.

Fish that begin their life cycle in freshwater, then migrate as juveniles to the ocean, where they grow into adults before migrating back into freshwater to […]

Angled bar racks and louvers are used to direct downstream migrating fish toward bypasses and sluiceways rather than through a hydropower plant. These structural guidance systems […]

Refers to the non-integral aspects of a hydropower facility such as substations and transmission lines.