Rest assured, the Gateway Arch is as structurally sound today as it was the day it was completed, according to an engineering report released by the National Park Service Monday.
The corrosion on the exterior of the Arch, was found to be cosmetic in nature, and engineers believe it is caused by the material in the welds that hold the Arch's sections together. The corrosion is "natural and minor, and does not threaten the integrity of the welds or the structure," the NPS news release said. A gentle cleaning of the stainless steal and dressing and polish for the welds should eliminate the stains on the Arch.
"We now know that St. Louis's most iconographic structure is in good health," said Tom Bradley, park superintendent. "The Arch may be a little discolored in some places, but we are now certain that it is part of the aging process, and we will work to keep this one of a kind structure in the best shape possible for future generations. It may take some time to get up there to clean it, but we will get it done."