Idaho Falls, city, seat (1911) of Bonneville county, southeastern Idaho, U.S., on the upper Snake River. Originally the territory of the Shoshone-Bannock and Northern Paiute Indians, it began as the Eagle Rock settlement at Taylor’s Ferry (1863), later Taylor’s Bridge. The town was renamed in 1890 for the low but wide (1,500 feet [460 metres]) cataract in the river (now a source of hydropower), and it developed first as a railroad division point and later as a centre of irrigated farming. The city has diversified industry, but its main sources of income are high-tech industry, agriculture (barley, potatoes), livestock, the nearby Idaho National Engineering and Environmental Laboratory (nuclear-power testing), and tourism. The Idaho Falls Mormon temple (1944) is a riverbank landmark. Inc. town, 1890; city, 1900. Pop. (2000) 50,730; (2010) 56,813.
This article was most recently revised and updated by Amy Tikkanen.
Snake River, largest tributary of the Columbia River and one of the most important streams in the Pacific Northwest section of the United States. It rises in the mountains of the Continental Divide near the southeastern corner of Yellowstone National Park in northwestern Wyoming and flows south through Jackson Lake along the eastern base of the Teton Range in Grand Teton National Park. Swinging northwest near the mouth of Greys River, it enters Idaho through the Palisades Reservoir. Near Heise the river leaves the mountains and crosses the broad Snake River Plain of southern Idaho, an area covered by lava beds. On the western edge of the state, it is joined by the Boise River. Turning north, it forms the boundary between Idaho and Oregon for 216 miles (348 km). From the northeastern corner of Oregon it forms the Washington-Idaho boundary to Lewiston, Idaho, and then turns west to join the Columbia just south of Pasco, Washington, after a course of 1,040 miles (1,670 km).
Runoff from the states of Wyoming, Utah, Nevada, Idaho, Oregon, and Washington combines in the Snake, which has a drainage basin of some 109,000 square miles (282,000 square km). From elevations of 10,000 feet (3,000 metres) the river descends to 300 feet (90 metres) at its outflow into the Columbia.
Snake RiverThe Snake River (left background) at Hagerman Fossil Beds National Monument, southern Idaho, U.S.
The upper Snake River, above King Hill, Idaho, is used for irrigation and hydropower. The main stream is regulated by several dams and reservoirs, the most expansive being American Fall Dam and Reservoir. In 1976 the Teton Dam collapsed, causing disastrous flooding of the upper Snake River valley. Principal tributaries below Heise are Henrys Fork (the largest), Blackfoot, Portneuf, Raft, and Big Wood rivers. Henrys Fork and Big Wood enter the Snake River from the north. Other northern side streams sink into the Snake River Plain and become part of an immense underground reservoir. Twin Falls and Shoshone Falls, with drops of 65 and 212 feet (20 and 65 metres) respectively, are located near Twin Falls city, downstream from Milner Dam.
The middle Snake River, from King Hill to Weiser, Idaho, is used primarily for hydroelectric generation. Most of the irrigation in this section is from tributary streams, principally the Payette, Owyhee, Malheur, and Boise rivers.
Snake RiverThe lower Snake River in Hells Canyon National Recreation Area, between Oregon and Idaho.
The lower Snake River, from Weiser to the mouth, flows through a gorge 1 mile (1.6 km) or more deep known as Hells Canyon, the deepest river gorge in North America. The Salmon River, its largest tributary, joins the Snake near the downstream end of the canyon section.
Numerous recreational facilities are located along the Snake’s course, including Hells Canyon National Recreation Area and Hagerman Fossil Beds National Monument in southern Idaho.
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