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The Blue Water Bridge spans the mouth of the St. Clair River between Port Huron and Sarnia, and just beyond it to the
north is Lake Huron, the world's fifth-largest lake, with a surface area of 23,000 miles (nearly as great as that of
West Virginia) and maximum depth of 750 feet.
The first bridge, a cantilever truss, opened in 1938. The second, a continuous tied arch, which we see foremost
in the picture, was completed in 1997. Both bridges stretch more than 6000 feet and the main spans are 871 and 922 feet, respectively.
Six lanes in all conduct traffic at this busy international border.
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