Released on August 4, 2003, this is the 24th coin released in the 50 State Quarters Program and the fourth released in 2003. Missouri, admitted into the Union on August 10, 1821, themed the coin, Corps of Discovery. The quarter is the first circulating coin to depict Lewis and Clark's historic expedition over 200 years ago, depicting the explorers' return to Saint Louis down the Missouri River. The Jefferson National Expansion Memorial (the Gateway Arch) is illustrated in the background, with the inscription "Corps of Discovery 1804–2004."
The obverse (heads) design features the familiar image of George Washington by John Flanagan, used on the quarter since 1932.
The reverse (tails) design features Lewis and Clark's historic return to St. Louis down the Missouri River, with the Jefferson National Expansion Memorial Gateway Arch in the the background.