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The Jefferson National Expansion Memorial Park was established on the banks of the Mississippi River, on December 21, 1935, to commemorate the westward growth of the United States between 1803 and 1890. Cost for the $30 million national monument was shared by the federal government and the City of St. Louis.
The park features the Gateway Arch, designed by architect Eero Saarinen who won the design competition in 1947. The stainless steel structure rises 630 feet high from a 60-foot foundation and spans 630 feet at ground level. Its classic weighted catenary curve sways 1/2" - 1" in 20 mph wind. The Arch weighs 17,246 tons.