Lewis & Clark National Historic Trail

Lewis and Clark National Historic Trail spans 4,900 miles, following the routes of the Lewis and Clark Expedition from Pittsburgh, Pennsylvania, to the mouth of the Columbia River near Astoria, Oregon. On November 10, 1978, the trail was established as part of the National Trails System. Spanning the continental United States, the trail connects many tribal lands and 16 states. The Lewis and Clark Expedition contributed significantly to scientific knowledge and to profound social, political, cultural, economic, and environmental changes to the land and people of North America. Members of the expedition traded with, learned from, and depended on friendly relations with more than 50 American Indian tribes throughout the course of their journey. Sacagawea, a Lemhi Shoshone woman who joined the expedition in April 1805, was essential to the success of the journey, sharing her knowledge of the landscape and the Shoshone language.