when did the corps of discovery go to the rocky mountains
A Journey of Discoveries. Lewis and Clark began their expedition at St. Louis and headed up the Missouri River, crossed over the Rocky Mountains and continued on to the Pacific Ocean at Fort Clatsop. The Corps of Discovery consisted of about 40 members.The Corps started their journey in May of 1804 and returned in September of 1806. Journey of Discoveries. Lewis and Clark began their expedition at St. Louis and headed up the Missouri River, crossed over the Rocky Mountains and continued on to the Pacific Ocean at Fort Clatsop. The Corps of Discovery consisted of about 40 members.