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In page Salmon River (California):

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Wildfires are the most significant mechanism of ecological change and one of the greatest threats to the river and its watershed. Fires are a natural part of this ecosystem, but are now often fueled by logging slash and fuels accumulated through decades of fire suppression efforts and therefore burn much hotter, more intensely, and more frequently than they would otherwise naturally burn. Large fires in 1977, 1987, 1994, 2006, 2008, 2013, 2014, and 2017 have contributed to increased erosion, causing increases in sediment in the river and its tributaries. The excessive sediment degrades the habitat of aquatic organisms, particularly for coho salmon, Chinook salmon, sturgeon and steelhead.