High on the Yellowstone plateau, America’s three great western river systems are born. The mighty Missouri begins its journey in the northwest corner of Greater Yellowstone and absorbs the pristine waters of the Yellowstone, Madison, Gallatin, Clarks Fork of the Yellowstone and Wind (Bighorn) rivers before its confluence 2,000 miles later with the Mississippi. The Snake rises in the southeast corner of Yellowstone and eventually helps the Columbia roll on to the Pacific. And the Green — “The Mother of the Colorado” — begins its watery trek to the Sea of Cortez on the flanks of the Wind River Range. They are the lifeblood of Greater Yellowstone.

A win for the Bear River: Dam proposal denied

Latest News: The Director of the Idaho Department of Water Resources has issued its Final Order denying the Twin Lakes Canal Company’s application for a permit to divert water from the Bear River which would ...

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Henry's Fork: Clearing the way for cutthroat

Overview: For over 70 years, the Chester diversion dam on Idaho’s world renowned Henry's Fork of the Snake River has prevented wild trout from migrating to spawning grounds and other productive habitat upstream. In October ...

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Idaho Waters: Protecting Highest Quality Streams and Rivers

Latest News: A federal court has ruled in our antidegradation case. We lost the battle but won the war on our challenge of the Environmental Protection Agency's approval of the state's definition of degradation in ...

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Snake River & Tributaries: Celebrating landmark protection

Overview: The Snake River and its wild tributaries are one of Greater Yellowstone's greatest treasures. In early 2005, GYC began working with Wyoming Sen. Craig Thomas to craft a historic bill to protect ...

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South Fork Snake: Paradise for wildlife, trout fishing

Overview: Among Greater Yellowstone’s incomparable trout streams, the South Fork of the Snake River is near the top. The 64 miles between Palisades Dam and the rivers confluence with the Henrys Fork meanders amidst one ...

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