U.S. Route 491 is a highway in the United States that runs through the states of New Mexico and Colorado. It stretches approximately 200 miles, connecting the town of Gallup, New Mexico to the Montana border. The route was designated in 2003, replacing the former U.S. Route 666. The highway is known for its scenic views, passing through diverse landscapes, including deserts and mountains. It serves as an important corridor for local communities and travelers, providing access to various attractions, such as the Navajo Nation and Mesa Verde National Park.