According to the National Bridge Inventory, there are 594,888 structures in the inventory as of December 2003: 474,515 are identified as bridges, and 120,373 as culverts. Of the 474,515, a total of 161,472 structures, or 34.0%, are classified as either structurally deficient or functionally obsolete. [How Durable Are Our Highway Bridges?] I-35W교의 붕괴 이후 불거진 미국내 교량들의 현주소를 확인하기 위한…
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