Almost 45 years into its reign atop the St. Louis skyline, the 630-foot monument is suffering from growing rust and decay. And nobody knows how extensive. Corrosion, some of it feared aggressive, and severe discoloration of the stainless steel skin have long been present, according to engineering reports reviewed by the Post-Dispatch. ... The problems are increasingly evident, with streaks and spots marking the upper reaches of the Arch exterior.
From stltoday.com via LinkedIn.
For more about the Gateway Arch, see here and here.
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