Lewis and Clark Expedition By shane0023 Period: Jan 1, 1803 to Jan 1, 1807 Lewis and Clark Expedition Jan 18, 1803 President jefferson asks congress to finance an exploratory mission going west May 2, 1803 The U.S. buys the lousiana purchase from france Aug 31, 1803 Lewis starts there expedition westward down the ohio river Oct 15, 1803 Lewis and Clark meet in idiana and recruit for the journey westawrd May 14, 1804 The core of discovery sets out from fort Dubois and heads up the missouri river Aug 20, 1804 Sergeant Charles floyd dies of pendasitis Oct 24, 1804 The core of discovery builds fort mandan to reside in during the winter Nov 4, 1804 Lewis and Clark meet the french-canadian fur trapper Toussaint Charbonneau and his wife Sacagawea Apr 7, 1805 The core od discovery resumes there journey upriver after winter ends Jun 13, 1805 The core of discovery reaches the great falls of the missouri Sep 11, 1805 The core of discovery enters the Bitterroot Range of modern day montana Nov 18, 1805 The core of discovery reaches the west coast, modern day vancouver-portland area Dec 7, 1805 The core of discovery builds fort clatsop Mar 23, 1806 The core of discovery starts there return home Jul 3, 1806 The core of discovery splits into two groups to find a faster way home Aug 12, 1806 The core is re-united at the mouth of the yellowstone river Sep 23, 1806 The core of discovery finaly returns to st. louis