We were all horrified to see the Interstate 35W bridge spanning the Mississippi River in Minnesota collapsed in 2007.
What may be surprising is a Discovery Channel report that indicates pigeons may be partially responsible for the collapse. Certainly experts arent looking to the pigeon as the brainchild of some terrorist plot, but the pigeons apparently do create a problem, and not just for bridges.
This DC report indicates pigeon guano is highly corrosive. Since these birds instinctively nest in concealed locations the discrete call of nature can provide significant and corrosive buildup given enough time.
Reports going back to 1987 indicate the birds were a problem in relation to the bridge in the collapse and their guano was especially problematic for bridge inspectors who recognized the potential problem. Screens were placed over openings in the bridge reducing nesting opportunities, but the birds continued to roost on the steel beams, which pigeons apparently view as a place to roost much like they would on cliffs in a more natural setting.
According to the report, the corrosive nature of pigeon guano may have actually accelerated rusting of the...
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