Located at the confluence of the Mississippi and Missouri Rivers, just several miles south of the current mouth of the Wood River (River Dubois) is Camp River Dubois. This new facility, operated by the Illinois Historic Preservation Agency, is designated as Site #1 on the Lewis and Clark National Historic Trail and features the Lewis and Clark Interpretive Center, a replica of the 1803-04 winter encampment, and the Lewis and Clark Monument. The Interpretive Center officially opened in December of 2002 and is one of six major historical Lewis & Clark sites in southwestern Illinois. This 15,000 square foot brick and cedar building tells the story of how the Corps of Discovery assembled equipment, supplies and men at Camp River Dubois.