Mackinac Bridge

The Mackino Bridge (Mackinac Bridge) is in Michigan, crossing the Mackino Waterway, connecting the Mackino on the Lower Peninsula and the Saint Ignas on the Upper Peninsula, and the bridge is also the boundary between Lake Michigan and Lake Huron. The bridge was built at the beginning of the world's second-longest suspension bridge (after the Golden Gate Bridge), and is now the world's fifth-longest steel cable suspension bridge, which is the largest span of the Western Hemisphere anchorage area.

The McKinnon Bridge was built in 1957 and is the third longest suspension bridge in the United States. It took nearly seven decades from the planned to built, and the McKinnon Bridge represents the advanced level of engineering design and construction in the United States at that time.