California's Massive Dam Removal Hit a Key Milestone. Now, There's a Problem

Last year, after the historic removal of four dams on the Klamath River, thousands of salmon rushed upstream into the long-blocked waters along the California-Oregon border, seeking out the cold, plentiful flows considered crucial to the fish's future.
The return of salmon to their ancestral home was a fundamental goal of dam removal and a measure of the project's success.
However, a problem emerged. The returning salmon only got so far. Eight miles upriver from the former dam sites...
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