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| St Louis Arch - Quick Facts: St. Louis Arch: Width: 630 feet Height: 630 feet Observation Platform capacity: 100-140 people, or 100lb/ft2 Arch Deflection: 18 inches in 150MPH wind (tested in wind tunnel) Thickness of plates for outer skin: 1/4 inch Arch exterior material: Stainless steel, #3, finish type 304 Inner skin of arch: A-7 Steel, 3/8 inch thick 900 tons of stainless steel panels, 14 inches thick Weight of Steel: Stainless steel exterior skin: 886 tons 3/8 inch Carbon steel interior skin: 2,157 tons Steel stiffeners: 1,408 tons Interior steel members, stairs, trains, etc: 300 tons Total Steel: 5,199 Weight of concrete: Between skins, up to 300 feet: 12,127 tons In foundation below ground: 25,980 tons Total Concrete: 38, 107 tons Foundation: 60 feet deep 300,000 ft3 of earth removed 252 alloy-steel tensioning bars anchor the arch to its base The bars are 1-3/4 inches in diameter, and have an ultimate strength of 145,000 psi The concrete holding the bars is rated for 5,000 psi Tram System: 2 Trams (1 in each leg) 8 cars per tram, 5 people per car Round trip is approximately 9 minutes Each tram capable of 200 to 225 people an hour In use for over 25 years, approximately 200,000 miles traveled and 18 million passengers
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