Lewis and clark By coltone Period: Jul 31, 1769 to Sep 1, 1838 Lewis and clark expedition Aug 1, 1770 William clark is born Aug 18, 1774 Lewis is born May 18, 1804 Expedition begins Feb 11, 1805 Sacagawea gives birth to her baby boy May 29, 1805 Clark names the Judith River after a girl he hopes to marry Jun 2, 1805 The lewis and clark expedition come to a fork in the river Jun 13, 1805 The expedition comes across the great falls of Missouri Oct 16, 1805 The expedition reaches the Columbia River Nov 7, 1805 Clark sees the ocean for the first time Mar 7, 1806 The expedition runs out of tobacco Jun 30, 1806 The expedition reaches the bitterroot mountains Sep 23, 1806 The expedition reaches St. Louis Oct 11, 1809 Lewis commits suicide Dec 20, 1812 Sacagawea dies Sep 1, 1838 William Clark dies