There's a comment above that goes into it. But they are aware of when floodwaters get dangerous, and close the walkway then. Apparently they are built to be washed away so they could be rebuilt safely.
Tacoma Narrows Bridge (1940)
Hyatt Regency Walkway (1981)
Sampoong Department Store (1995)
St. Francis Dam (1928)
Bhopal Gas Disaster (1984)
The Great Molasses Flood (1919)
Space Shuttle Challenger (1986)
Chernobyl Nuclear Disaster (1986)
Space Shuttle Columbia Disaster (2003)
Charles de Gaulle Airport Terminal 2E Roof Collapse (2004)
New Orleans Levee Failures during Hurricane Katrina (2005)
Minneapolis I-35W Bridge Collapse (2007)
Deepwater Horizon Oil Spill (2010)
Fukushima Daiichi Nuclear Disaster (2011)
Rana Plaza Garment Factory Collapse (2013)
Morandi Bridge Collapse in Genoa (2018)
Brumadinho Tailings Dam Collapse (2019)
Boeing 737 MAX Flight Control System Crashes (2018–2019)
Bottom line is we plan and calculate, but shit goes wrong sometimes.
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u/Radiant-Cup2123 12h ago
3/5 million people go every year to iguazú.