The Yuba River is a tributary of the Feather River in the Sacramento Valley of the U.S. state of California. It is one of the Feather's most important branches, providing about a third of its flow. The main stem of the river is about long, and its headwaters are split into North, Middle and South forks; the confluence of the former two is considered the beginning of the Yuba. The river drains about of the western slopes of the Sierra Nevada mountain range as well as a small portion of the Sacramento Valley.