From the website:
The Lewis and Clark Trail begins in Washington D.C. and zigzags along the eastern seaboard encompassing the states of Delaware, Maryland, Virginia, and Pennsylvania then proceeds through Ohio, West Virginia, Kentucky, Indiana, Illinois and Missouri. The Trail then meanders through the great plains of Kansas, Nebraska, Iowa, South Dakota, North Dakota and continues through the mountains and the valleys of Montana, Idaho, Washington, Oregon, concluding at the Pacific Ocean. The Lewis and Clark Trail is a cultural destination that covers over 4,600 miles, crosses four time zones, and showcases some of the most beautiful and rugged areas of America.