In a period of 16 months, four dams built between 1903 and 1962 came down as part of a monumental effort to clear 35 miles of the Klamath River spanning Oregon and California. The project owner, the Klamath River Renewal Corp., describes it as the largest dam removal effort in U.S.—and possibly world—history.

After demolition of the first dam last year, all work concluded in September, clearing 35 river miles of infrastructure and debris while opening more than 400 miles for salmon passage for the first time since the structures were built.