The Straits of Mackinac Shipwreck Preserve are divided in two by a bridge spanning how long?
Mackinac Bridge The Mackinac Bridge ( ) is a suspension bridge spanning the Straits of Mackinac to connect the Upper and Lower Peninsulas of the U.S. state of Michigan. Opened in 1957, the 26372 ft bridge (familiarly known as "Big Mac" and "Mighty Mac") is the world's 19th-longest main span and the longest suspension bridge between anchorages in the Western Hemisphere. The Mackinac Bridge is part of Interstate 75 and the Lakes Michigan and Huron components of the Great Lakes Circle Tours across the straits; it is also a segment of the U.S. North Country National Scenic Trail. The bridge connects the city of St. Ignace on the north end with the village of Mackinaw City on the south.
Trammell Bridge The Trammell Bridge is 1.6 miles long and carries State Road 20 over the Apalachicola River in the Florida Panhandle between Blountstown and Bristol. It is named for three members of the Trammell family: (1) U.S. Senator from Florida and former governor Park M. Trammell, who died in office in 1936; (2) his brother, John D. Trammell, member of the Florida legislature representing Calhoun County (Blountstown) who introduced the bill to construct the original bridge; and (3) Robert D. Trammell, John Trammell's grandson who represented the area in the Florida legislature and secured funding for the new bridge.