Meriwether Lewis and William Clark of the Corps of Discovery stayed at Camp River Dubois during the winter of 1803–1804 on their journey to find an all-water route to the Pacific Ocean. For five months, the Corps stayed near the confluence of the Mississippi and Missouri Rivers, training and preparing for the long journey ahead. On May 14, 1804, the expedition traveled up the Missouri River during its journey to the Pacific Ocean. The area has seen many changes since 1804, and the Corps of Discovery left on a rainy May afternoon.