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is a city in Gallatin County, Montana, United States. The population was 1,728 at the 2000 census. Three Forks is named because it lies near the point, in Missouri Headwaters State Park, where the Jefferson, Madison, and Gallatin Rivers converge to form the Missouri River.
The three rivers, west to east, were named by Meriwether Lewis in late July 1805 for President Thomas Jefferson, Secretary of State James Madison, and Treasury Secretary Albert Gallatin.
Honored in Three Forks, the Indian woman Sacagawea is best known as the interpreter and guide for the Lewis and Clark Expedition. In 1800, she was captured by the Mennetaree tribe near the present site of Three Forks. She later returned to this area with Lewis and Clark and the Corps of Discovery. A statue of Sacagawea now sits in a park off Main Street.
According to the United States Census Bureau, the city has a total area of 1.3 square miles (3.4 km²), of which, 1.3 square miles (3.3 km²) of it is land and 0.04 square miles (0.1 km²) of it (3.05%) is water.