River in northwest USA, the largest tributary of the Columbia River; 1,670 km/1,038 mi in length. Rising as the South Fork in a lake 2,375 m/7,790 ft above sea-level in the Yellowstone National Park, Wyoming, it flows southwest through Idaho, turning north to form the border of Idaho between Oregon and then Washington, and joining the Columbia near Pasco. Its course travels 65 km/40 mi through the 2,400 m-/7,874 ft-deep Hell's Canyon, one of the deepest gorges in the world.
The river also passes through Jackson Lake in Grand Teton National Park.
Navigation is hindered by rapids and falls, the largest of which are the Shoshone Falls in Hell's Canyon, with a drop of 60 m/197 ft. Hell's Canyon and lower sections of the river have been extensively dammed. Hydroelectricity is generated, and widespread irrigation in southern Idaho has created agricultural land for the production of Idaho potatoes and other crops.
The Snake was placed on the Most Endangered Rivers list in 2002 as salmon and steelhead were being badly affected by four federal dams erected in the 1970s.
Relief: 3048 m Basin area: 281,000 km 2 Mean discharge: 1565 m 3 /s Mean annual precipitation: 36 cm Mean air temperature:...
river, 1,038 mi (1,670 km) long, NW United States, the chief tributary of the Columbia; once called the Lewis River. The Snake rises in NW Wyoming,