Thirteen thousand Chinook salmon swam past the former Iron Gate Dam site in 2025 — a river once blocked by concrete now flowing freely again. These powerful fish, some stretching over a meter long, are returning to spawning grounds in the Klamath River that had been cut off for more than 100 years. Their comeback follows the removal of four dams in 2024, a landmark moment for river restoration in the United States. The Klamath, which runs through southern Oregon and northern California, had seen its salmon populations drop by about 90% due to the dams. But now, life is rushing back.
The return of the salmon matters not just for the fish, but for entire ecosystems and communities. Chinook are a keystone species — their presence supports bears, eagles, and orcas, and they hold deep cultural and nutritional value for Indigenous tribes like the Yurok, Karuk, and Hoopa. For decades, these communities fought for dam removal, knowing that healing the river meant healing their way of life. Now, with 345 kilometers (214 miles) of river reopened, the salmon are reclaiming 88% of their known historical habitat.
Scientists were watching closely. Damon Goodman, lead author of a new study on the fish’s return, said they expected salmon to come back — but not this fast. "What surprised us was the speed and scale of their response – it felt like we were running to keep up with the fish!" Using an underwater sonar camera near the former Iron Gate Dam, researchers tracked fish through muddy, dark waters where regular cameras fail. The device uses sound waves to create moving images, letting them count and identify Chinook even in tough conditions. In the first year after dam removal, 7,742 salmon made the journey upstream. The next year, more than 13,000 passed through.
This rapid return shows that salmon still remember their ancient paths, even after a century of blockage. But scientists caution that this is just the beginning. For populations to fully recover, the fish need clean water, safe passage, and successful spawning over many generations. "Dam removal was an enormous step forward, but it doesn’t eliminate all the challenges facing salmon," Goodman said. Other threats — like warming waters and habitat degradation — still remain.
Still, the momentum is real. Scott Hinch, a salmon ecologist at the University of British Columbia who wasn’t involved in the study, called the recovery "remarkable." The Klamath is now one of the largest dam removal projects in U.S. history, and its success could inspire similar efforts worldwide. Rivers, it turns out, can heal — and so can the life within them.