During the summer of 2021, one of the more than 100 concrete double-tee beams making up the roof system of a massive underground reservoir outside of Pueblo, Colorado, collapsed and failed. At 188 feet wide and 224 feet long, the cast-in-place storage tank—which serves the city of Pueblo’s water-distribution system—covers more than 42,000 square feet of land. It was originally cast in the 1930s, with the double-tee roof added in the 1970s.
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