Lewis and clark expidition By jarred1jarred Jan 18, 1803 President Thomas Jefferson asked Congress to finance an expedtion to explore the western part of North America. Congress quickly approved the request. Period: Jan 18, 1803 to Sep 23, 1806 from the start to the end May 2, 1803 U.S. representatives signed a treaty with Grance to purchase the Lousiana Territory Jun 18, 1803 Captain Meriwether Lewis, Jefferson's choice to lead the expedtion, asked William Clark to serve as co-leader Aug 31, 1803 Lewis launched the expedition boat down the Ohio River from Pittsburgh, Pennsylvania Oct 15, 1803 Lewia and Clark met in Clarksville, Indiana, where Clark had recuited men for the expedition Dec 13, 1803 The expedition estabilished winter quarters at Camp Dubois, near St. Louis, Missouri May 14, 1804 The expedition set out from Camp Dubois and headed up the Missouri River Oct 24, 1804 The group began to build Fort Mandan for its winter camp Apr 7, 1805 Winder was over and the journey resumed up the Missouri River. Jun 13, 1805 The group reached the Great Falls of the Missouri River and soon began an 18-mile onland trip around the waterfalls. Nov 18, 1805 The groupreached the Pacific coast Dec 7, 1805 The group began to build Fort Clatsop for its winter quarters Mar 23, 1806 The group heads back towards home Jul 27, 1806 Lewis's group killed two Blackfeet Indians who tried to steal guns and horses. (this was the only blood shed the whole trip) Sep 23, 1806 The expedition arrived back in St. Louis