The Snake River is the chief department of the Columbia River. The Snake River rises in Wyoming close to the Continental Divide in Yellowstone Nationwide Park. The river then flows south by means of Grand Teton Nationwide Park. It bends west and flows throughout the Snake River Plains of southern Idaho.
The Snake River turns north on the Oregon border. The river varieties a part of the boundary between Idaho and Oregon and flows by means of Hells Canyon. At Lewiston, Idaho, the Snake turns west and flows by means of southeastern Washington. The Snake River joins the Columbia River close to Pasco, Washington, 1,038 miles (1,670 kilometers) from its supply.