The Blue Water Bridge was first commissioned in 1928 but the Depression delayed completion until 1938. It is a twin span, arch cantilevered, steel bridge, 6535 feet long. It is an international bridge linking Port Huron, Michigan in the USA to Sarnia in Ontario, Canada, across the St Clair river at its narrowest point. The bridge was financed through bonds and a toll. In 1997, a second twin bridge was added to carry the increased traffic. The bridge won several awards for the complementary design. It is once again a toll bridge and the border posts on either side are open 24/7.

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