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The memorial site consists of a 90 acre (360,000 m²) park along the Mississippi River on the site of the original city of St. Louis; the Old Courthouse, a former state and federal courthouse which saw the origins of the Dred Scott case; the Museum of Westward Expansion; and the Gateway Arch, a steel catenary arch that has become the city's emblem.
In 1947, a group of civic leaders held a national competition to select a design for the main portion of the Memorial space. A young Finnish-American architect named Eero Saarinen won this competition with plans for a 590 foot (180 m) catenary arch to be placed on the banks of the Mississippi River. However, these plans were modified over the next 15 years, placing the arch on higher ground and adding 40 feet (12 m) in height and width.
The construction of the Arch began February 12, 1963 and was completed on October 28, 19651965 was a common year starting on Friday (the link is to a full 1965 calendar). Events January-February January 4 United States President Lyndon Johnson proclaims his " Great Society" during his State of the Union address. January 14 Prime Ministers of N, costing less than $15 million to build. US Vice President Hubert Humphrey and Secretary of the Interior Stewart UdallStewart Lee Udall (born January 31, 1920) was an American politician. He served as U. Representative from Arizona from 1955 to 1961 and then as Secretary of the Interior under Presidents John F. Kennedy and Lyndon B. Johnson from 1961 to 1969. He was the dedicated the Arch on May 25May 25 is the 145th day of the year in the Gregorian calendar (146th in leap years). There are 220 days remaining. Events 1085 Alfonso VI of Castile takes Toledo, Spain back from the Moors. 1420 Henry the Navigator is appointed governor of the Order of Ch, 1966Events January January 1 In a coup, Colonel Jean-Bedel Bokassa ousts president David Dacko and takes over the Central African Republic. January 2 Strike of public transportation workers in New York City ends January 13 January 3 First Acid Test at the Fil.
The Arch stands 630 feet (192 m) tall, and is 630 feet (192 m) at its widest point; by ordinance it is the tallest structure in the city. Its legs are equilateral triangles, narrowing from 54 feet (16.5 m) at the base to 17 feet (5.2 m) at the top. Each wall consists of a stainless steelIn metallurgy, stainless steel is defined1 as a ferrous alloy with a minimum of 10. 5% chromium content. Such steels have higher resistance to oxidation ( rust) and corrosion in several environments. It was invented in 1913, at the research laboratory of skin covering reinforced concreteSainte Jeanne d'Arc Church (Nice, France): architect Jacques Dror, 1926 1933 Reinforced concrete is plain concrete in which steel reinforcement rods or bars (" rebars") have been incorporated to strengthen the naturally brittle concrete. The use of reinfo from ground level to 300 feet (91 m) or carbon steel and rebar from 300 feet (91 m) to the peak. The interior of the Arch is hollow and contains a unique transport system leading to an observation deck at the top.