World's Largest Dome Structures: Louisiana Superdome & Beyond
The Louisiana Superdome (Caesars Superdome) in New Orleans holds the title for largest fixed dome structure by diameter — but "largest" depends on metric.
Louisiana Superdome (New Orleans, USA)
- Diameter: 680 ft (207 m)
- Height: 273 ft (83 m)
- Volume: 12,476,000 ft³ (353,000 m³)
- Area: 9.7 acres (3.9 ha) — covers 13 acres with ramps
- Capacity: 73,208 (football); 76,468 (basketball); 80,000+ (concerts)
- Completed: 1975; renovated 2006 (post-Katrina), 2023 ($450M)
- Structure: Steel truss lamella dome; 9,000 tons steel
Other "Largest" Contenders by Metric
| Metric | Structure | Location | Value |
|---|
| Diameter (fixed) | Louisiana Superdome | New Orleans, USA | 207 m |
| Diameter (retractable) | Singapore National Stadium | Singapore | 310 m (retractable roof) |
| Clear span (no supports) | AT&T Stadium | Arlington, USA | 275 m (retractable roof) |
| Volume (enclosed) | Boeing Everett Factory | Everett, USA | 13.3M m³ (not a dome) |
| Surface area (dome) | Jeddah Super Dome | Jeddah, KSA | 35,000 m² (2021) |
| Historic masonry | Pantheon | Rome, Italy | 43.3 m diameter (126 AD) |
Superdome's Defining Moments
- 1978: NBA All-Star Game
- 1980: Republican National Convention
- 1997: Super Bowl XXXI
- 2005: Hurricane Katrina — shelter of last resort (26,000+ people); roof damaged, interior flooded.
- 2024: Super Bowl LIX scheduled
Engineering Significance
The Superdome pioneered large-scale lamella truss domes — geometrically efficient, redundant load paths. Its 1975 completion pushed the diameter envelope 50% beyond the previous record (Houston Astrodome, 1965: 216 m diameter but not a true dome — it's a lamella roof on columns).
Future Challengers
Proposed: Tokyo Olympic Stadium (retractable, 200 m), NEOM Stadium (Saudi Arabia, 250 m+). But fixed-dome record stands nearly 50 years.
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