The Lewis and Clark State Historic Site opened in 2002 and is owned and operated by the Illinois Historic Preservation Agency. The site, located in Hartford, Illinois, commemorates Camp River Dubois, the camp of the Lewis and Clark Expedition from December 1803 to May 1804. The site is National Trail Site #1 on the Lewis and Clark National Historic Trail and is located directly off the Confluence Bike Trail, part of the Confluence Greenway.