Course
Most of the Yuba's flow is incorporated from its three main tributaries, the North Yuba, Middle Yuba and South Yuba. All three rivers run westwards from the crest of the Sierra Nevada to form the main stream of the Yuba. The beginning of the main stem is defined as the confluence of the North and Middle Yuba Rivers. The North Fork is longer, but the Middle Fork is considered the main stem.
Read more about this topic: Yuba River