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Sacramento/Feather Riverine Alluvium

Ecoregion in Central Valley, CA

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The Sacramento/Feather Riverine Alluvium ecoregion consists of nearly level floodplains and levees associated with the Sacramento, Feather, and lower Yuba and Bear Rivers. Much of the unweathered gravel, sand, and silt deposits are in contact with present-day river systems and have constantly changing morphology. Flows of the major rivers are artificially controlled, and confined by built levees. Entisols, Mollisols, and Alfisols are more common compared to the Vertisols typical of the adjacent basins of Ecoregion 7c. The xeric soils are moderately well to somewhat poorly drained and support pasture, wheat, fruit and nut orchards, and woody wetlands. Cottonwoods and mixed willows are present, along with some grasslands. Affected in places by historical mining practices in the Sierra Nevada, the riverine region includes areas of gold field tailings on the Yuba and Feather Rivers.

— EPA

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