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How large was the Astrodome’s roof span?

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Michigan Stadium, Ann Arbor — Stadium Aerial view of Michigan Stadium, home to the gridiron football team of the University of Michigan, Ann Arbor.

The Astrodome, a landmark of late Modernist stadium architecture, features a Lucite-paneled dome that spans 642 feet (196 metres). This structure is supported by a steel lattice and utilizes a lamella roof design, which consists of an interlocking network of short members arranged in a diamond pattern.12