Lewis and Clark Timeline By 20TYADAM Apr 30, 1803 Louisiana Purchase Signed Oct 24, 1804 Discover Earth Lodges Nov 4, 1804 Meet Sacagaweea Dec 24, 1804 Finish Fort Mandan Apr 7, 1805 Send Artifacts Home Apr 7, 1805 Sacagaweea saves valuables from tipped boat May 16, 1805 Reach Pacific Nov 8, 1805 Stay at Fort Clatsop Sep 23, 1806 Return to St. Louis Dec 3, 1903 Dec-3-march 28