Dams

Human activities have imperiled our waterways — along with almost one-third of freshwater fish and many other aquatic species.

A rare “orchid of the falls” plant has been declared extinct after a hydroelectric dam destroyed its only habitat. Could others soon follow?

Removing dams is one thing, but thousands of levees also restrict rivers in the United States — and they’re not working as intended.

Mounting studies highlight greenhouse gas emissions from reservoirs, and now a coalition of environmental groups has called for regulatory action.

A modern movement to restore the lake symbolizes the broader contest between unsustainable industrialization and challenges such as climate change.

The United States must grapple with a legacy of 90,000 dams, many unsafe or unwanted.

U.S. states hope to tap Canada’s network of large dams to meet low-carbon goals, but do better options exist closer to home?

A plan to import hydropower from Canada to Massachusetts begs the question of whether big hydro along with its reservoirs and dams, is green enough to be worth the cost.

After a half-century of failures, the recovery of the Connecticut River ecosystem hangs in the balance. Will authorities finally act to save it?

A river-restoration advocate looks back at her family’s forgotten history to gain new insight into the history — and future — of our country’s rivers.