Being an old Ironworker who has erected a few bridges, I have never come across the use of stainless steel. I have although seen galvanized steel and a rubberized paint [scary slippery] used fairly recently. This bridge was built in 1962 and seemingly not maintained properly. Regular sandblasting and painting has to be done. The urine , I believe, would play havoc with the paint and the iron, especially if the bridge is near saltwater, it's going to rot. Just my take on it.
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