Because as the metal expands from so much heat there is no room for the mechanism to actually work in this much heat. So, water trucks were brought in while bridges were down to spray on the metal to cause evaporation so they could still raise and lower the drawbridges for ships to go by on Rivers under the drawbridges. Also, roads not used to this heat buckled that were asphalt and cement roads powdered and crumbled from the heat that they were not built to withstand.
If you live somewhere that gets hot all the time yearly you can design roads and bridges for the heat. But, roads and bridges were never designed this way in Portland and Seattle because temperatures like this never happened ever before. It's a once in 10,000 years or maybe 1000 years event.
But, because of global climate change this could now "potentially" happen every summer too the way things are going here on earth.
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