Feather River, a stream rising in the N. E. part of Plumas co., California, which i flows S. W. and S. through a rich gold region, and empties into the Sacramento, 30 m. above Sacramento City; length about 180 m. It is navigable as far as Marysville, to which point steamboats ascend from San Francisco. The North and Middle forks, and Yuba river, are its principal tributaries.