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In looking at the picture of the arch I wasn't aware that Pittsburgh-Des Moines Steel was involved in it .PDM was a oil tank,water tank builder that sold out to Chicago Bridge and iron .Funny according my references CBI only ever built one bridge .

You can see the arch from miles away on interstate 70 going into St Louie .

Interesting thread .I think we get caught up with modern methods which just use the same laws of physics similar to old school methods that have been around for thousands of years .If it worked then,it will work now,nothing has changed .