How long would the St. Louis arch stand if humanity vanished from the earth, tomorrow?

How long would the St. Louis arch stand if humanity vanished from the earth, tomorrow? What would be the failure mechanism?

Note: I'm following the directions to ask a specific question, but if it's too particular to be interesting, generalize it to other iconic structure durations.

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How long would the St. Louis arch stand if humanity vanished from the earth, tomorrow?

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