How Many Rivers Flow Into The Columbia River?
How Many Rivers Flow Into The Columbia River? Major tributaries are the Kootenay, Snake, Pend Oreille, Spokane, Okanogan, Yakima, Cowlitz, and Willamette rivers. High flows occur in late spring and early summer, when snow melts in the mountainous watershed. How many tributaries flow into the Columbia River? Columbia River • maximum 1,240,000 cu ft/s (35,000