GATEWAY ARCH. The Gateway Arch is located in St. Louis, Missouri on the Mississippi Riverfront. In December 1935, the Jefferson National Expansion Memorial was built to commemorate the westward expansion of the
nation. A competition was conducted in 1948 to design a monument for the memorial and architect Eero Saarinen won with his 630-foot catenary arch design. Construction began in 1963 and was completed on 28 October 1965; the cost of the entire project was less than $15 million. The National Park Service oversees the operation of the arch and the surrounding landmarks, which include the site of the 1847 and 1850 hearings of the Dred Scott v. Sandford case.
Jefferson National Expansion Museum Home Page. http://www.nps.gov.jeff.