Snake River

About

Snake River, Idaho — 1805-1806 Lewis and Clark, 1889 Salmon Peak, 1976 Teton Dam Failure. Paddlers who put in on the Idaho stretch of the Snake meet a river measured at USGS gauge 13310199, where flows average about 2,838 cubic feet per second and the optimal window runs from 1,400 to 4,250 CFS. Difficulty spans Class I through VI, a range that reflects a river shifting from broad plain water to the confined violence of Hells Canyon, the deepest canyon in North America. The named sections tell the same story: Hells Canyon, Pittsburg Landing to the OR/WA Line, the OR/WA Line to River Mile 165.5, and the Main Snake.

Long before commercial traffic, the Snake flowed through the ancestral territory of the Shoshone-Paiute, the Nez Perce, the Coeur d'Alene, the Kootenai, and the Northern Paiute in central and northern Idaho. The river was a primary travel corridor, fishing ground, and gathering place, and those tribes maintain cultural connections and treaty-protected rights today. The 1855 Treaty of Walla Walla, the 1863 Treaty of the Oregon Trail, the 1867 Treaty, and the 1873–1877 Nez Perce War established the cession framework that reshaped who controlled the corridor.

The river's defining historical chapter is the 1805–1806 Lewis and Clark expedition, when the Corps of Discovery descended the Snake to the Columbia in October 1805. Commercial salmon fishing followed: an era beginning in 1861 saw peak harvests in 1889. As white settlement spread, the Snake was logged from the 1860s through the 1920s to support Idaho's 1870–1910 white-pine, Douglas-fir, and cedar industry, the Oregon Short Line and Northern Pacific Railway expansion, and the intermountain-west mining-timber trade. County sawmills, logging drives, and silver- and lead-mine timber operations were the major operators until the white-pine stands were exhausted around 1910, state forestry conservation began in 1915, and the Boise, Caribou, and Sawtooth National Forests were created in the 1920s and 1930s.

The modern river was shaped by engineering. The 1906–1917 Milner Dam ranked among Idaho's earliest Reclamation Service projects. In a darker chapter, the Teton Dam — a Bureau of Reclamation structure — failed on June 5, 1976, killing 11 people and causing $400 million in damages. Hydrological understanding advanced alongside the dams: the 1890s–1910s USGS Idaho Survey, the gauging stations established in the early twentieth century, and later Idaho Department of Water Resources streamflow surveys produced the first comprehensive assessments, work that continues through the 2000–2024 Idaho TMDL program.

Today the Snake is a National Wild & Scenic River managed by the U.S. Forest Service, and it lies within the 1975 Hells Canyon National Recreation Area. Restoration defines the present era: since 2010 the Idaho Department of Water Resources, working with watershed partnerships, the Shoshone-Paiute Tribes, and the Nez Perce Tribe, has addressed more than a century of logging, mining, and agricultural impacts through streambank stabilization, native fish restocking including salmon, steelhead, and bull trout, and salmon recovery programs. The Snake River sockeye recovery program, running since 1991, supports the endangered Snake River sockeye. The volcanic corridor remains both the historical and economic spine of Idaho.