...that 90-plus-degree heat Wednesday and the above-normal temperatures of the past two summers may have been a contributing factor.
"Did the heat put extra strain on the steel?" Hortman said. "You wonder if this bridge was built to withstand the massive heat we have had this summer."
Wow, it gets a lot hotter in Minnesota than I thought.
For her edification I include these links.
Steel
Bessemer Process
H/T to smalldeadanimals
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