The Snake then swings down in an arc across southern Idaho, following the Snake River Plain. In doing so it passes through the cities of Idaho Falls (and the American Falls Reservoir). Near Twin Falls, the river flows into Idaho's Snake River Canyon over Shoshone Falls and under the Perrine Bridge. It then continues towards Boise and the Idaho/Oregon border. It then flows north through Hells Canyon, and past the cities of Lewiston, Idaho and Clarkston, Washington. It then turns into Washington, passes through many hydroelectric dams and finally joins the Columbia River near Pasco, Washington.Tributaries of the Snake include the Teton River, Henrys Fork River, the Boise River, the Salmon River, and the Clearwater River.The Snake River's many hydroelectric power plants are a major source of electricity in the region. Its watershed provides irrigation for various projects, including the Minidoka, Boise, Palisades, and Owyhee projects by the United States Bureau of Reclamation, as well as a variety of private projects such as at Twin Falls. However, these dams have also had an adverse environmental effect on wildlife, most notably on wild salmon migrations. Some conservation organizations and fishermen are seeking to restore the lower Snake River and Snake River salmon and steelhead by removing four federally-owned dams on the lower Snake River.Snake River is home to a variety of outdoor sporting activities, including fly-fishing, hiking and biking, golf, and horseback riding.The Snake runs through a number of gorges, including one of the deepest in the world, Hells Canyon, with a maximum depth of 7,900 feet (2,410 m).The Snake is the largest tributary of the Columbia River, with a mean discharge of 50,000 cubic feet per second

(Source by Wikipedia)