Description Nature For All, Hells Canyon Autumn Snake RiverThe Snake River is a major river of the greater Pacific Northwest region in the United States. At 1,078 miles (1,735 km) long, it is the largest tributary of the Columbia River, in turn the largest North American river that empties into the Pacific Ocean.[9] The Snake River rises in western Wyoming, then flows through the Snake River Plain of southern Idaho, the rugged Hells Canyon on the OregonIdaho border and the rolling Palouse Hills of Washington, emptying into the Columbia River at the Tri-Cities, Washington.Hells Canyon is a ten-mile-wide (16 km) canyon in the western United States, located along the border of eastern Oregon, a small section of eastern Washington and western Idaho. It is part of the Hells Canyon National Recreation Area which is also located in part of the Wallowa-Whitman National Forest.[2] It is North America's deepest river gorge at 7,993 feet (2,436 m).[3][4] Notably, Hells Canyon runs deeper than the better-known Grand Canyon in Arizona.[5][6]Wikipedia