Discovery News reports:
Pounded and strained by heavy traffic and weakened by missing bolts and cracking steel, the failed interstate bridge over the Mississippi River also faced a less obvious enemy: pigeons.
Inspectors began documenting the buildup of pigeon dung on the span near downtown Minneapolis two decades ago. Experts say the corrosive guano deposited all over the Interstate 35W span's framework helped the steel beams rust faster.
Thank you for your article.
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President
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P.O. Box 5250
Johnstown, PA 15904
[email protected]
Posted by: Jack Shaw | August 24, 2007 at 01:36 PM
Neat! I've seen those on buildings in my town.
Posted by: gail | August 24, 2007 at 01:39 PM