ST. LOUIS, Mo. (KMOX) — Turns out the corrosion on the Gateway Arch is nothing more than a cosmetic annoyance.

That’s according to the National Parks Service. A Chicago engineering firm has just completed a study of the monument. They says the corrosion is simply discoloring, probably from the welds that hold the arch’s sections together.

There is a similar discoloration along the bottom of the arch where people have carved into the stainless steel.

It’s not clear yet how the corrosion will be cleaned.

The firm suggests to reach the high-up spots they’ll have to come up with a rappelling solution, similar to what was used on the Washington Monument recently.

The report also says “the arch is in excellent structural shape” — and adds that there aren’t any examples of similar corrosion on other stainless steel structures.


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