The Madison, Jefferson, and Gallatin rivers come together to form the mighty Missouri River within Missouri Headwaters State Park, a National Historic Landmark. At 2,540 mi, the Missouri is the country's longest river, after the Mississippi. Lewis and Clark named the three forks after Secretary of the Treasury Albert Gallatin, Secretary of State James Madison, and President Thomas Jefferson. The park has historical exhibits, interpretive signs, picnic sites, hiking trails, and camping.
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