The Big Lost River is a major river in the U.S. state of Idaho, about 135 miles long. The river starts in the Rocky Mountains and flows in a generally southeast direction into the Snake River Plain. True to its name, the Big Lost River's surface flow does not reach any larger river but vanishes into the Snake River Aquifer at the Big Lost River Sinks, giving the river it…The Big Lost River is a major river in the U.S. state of Idaho, about 135 miles long. The river starts in the Rocky Mountains and flows in a generally southeast direction into the Snake River Plain. True to its name, the Big Lost River's surface flow does not reach any larger river but vanishes into the Snake River Aquifer at the Big Lost River Sinks, giving the river its name. The river is one of the Lost streams of Idaho, several streams that flow into the plain and disappear into the ground.
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