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he Klamath River was once the third-largest salmon river in the United States, but over the last century, salmon populations have declined by more than 90%. The construction of dams severely impacted salmon stocks, extirpating them from half of the river’s basin. The reservoirs led to toxic algae blooms in summer and fall, with some years reporting levels over 4,000 times the World Health Organization’s safety limits. Warmer water released during salmon migration also contributed to disease outbreaks that caused significant mortality among adult salmon and steelhead. Furthermore, the dams trapped sediment, enabling the spread of Ceratonova shasta disease, which decimated juvenile salmon each spring.
For over a century, these dams have been the main barrier to the recovery of wild salmon and steelhead, with climate change worsening the effects.
The Indigenous-led campaign to un-dam the Klamath took about 25 years, and the deconstruction of all four dams was completed in roughly 18 months. Remarkably, just three days after the removal was finalized, salmon began swimming past the former dam sites. Within ten days, sonar detected 290 salmon and steelhead moving upstream in a single day, and soon after, they were observed spawning in Oregon for the first time in a century.
In the weeks that followed, hundreds of chinook were documented spawning in all the tributaries and mainstem river along the 50-mile hydro reach. As reports of salmon continuing to enter the ocean emerge, it’s likely that these numbers will grow into the thousands. These returning salmon are remarkably healthy, vibrant, and disease-free—clear indicators of improved river conditions following the removal of the dams and a testament to the resilience of nature. Our feature documentary Undamming Klamath will debut in 2026.