<Li> July 3: The Corps of Discovery split into two groups with Lewis leading one group up the Blackfoot River and Clark leading another group up the Bitterroot River . </Li> <Li> July 3--28: Lewis's party heads back to the Great Falls of the Missouri . Sgt . Gass, J. Thompson, H. McNeal, R. Field, R. Frazier, J. Fields, W. Werner, G. Drouillard, S. Goodrich . </Li> <Li> July 7: Lewis' group crosses the Continental Divide at Lewis and Clark Pass . </Li> <Li> July 13: Reached White Bear Island . Opened cache and many items were ruined . The iron frame of the boat had not suffered materially . </Li>

What happened on lewis and clark's expedition