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As of 2025, this dataset represents the official National Park Service centerline of the Lewis and Clark National Historic Trail Auto Route. It was created by the National Park Service with assistance from U.S. Department of State interns, derived from U.S. Census Bureau TIGER/Line road data. The Auto Route is a system of roads and highways bracketing the historic trail across 16 states.
License is us-pd (public domain). Data is accessible via API.