The largest dam removal project in U.S. history was completed Wednesday, marking a major victory for tribes in the region who fought for decades to free hundreds of miles of the Klamath River near the California-Oregon border.

Through protests, testimony and lawsuits, local tribes showcased the environmental devastation due to the four towering hydroelectric dams, especially to salmon, which are are culturally and spiritually significant to tribes in the region. The dams cut salmon off from their historic habitat and caused them to die in alarming numbers because of bad water-quality conditions.

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