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Fly fishing on the Madison River
The Madison River flows along the West Entrance road into Hebgen Lake outside the park. Although the river's origin is in the high plateau region of Yellowstone Park, which is notoriously cold, the water temperature on most sections of the river is remarkably warm. Considering this high mountain river runs right through the most thermally active region in the United States, its summer temperature, often more than 70 degrees, is not so unusual.