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.
Maestri Bridge The Maestri Bridge (originally known as the Pontchartrain Bridge and later as the Watson-Williams Pontchartrain Bridge and the Five Mile Bridge) carries U.S. Route 11 (US 11) across Lake Pontchartrain between New Orleans and Slidell, Louisiana, in the United States. The bridge opened on February 18, 1928, as the first permanent crossing of Lake Pontchartrain. The 4.78 mi bridge was the longest concrete bridge in the world upon completion. The bridge is 35 ft wide and has two bascule-type draw spans for passing vessels and barges. The bridge was originally a toll structure, costing $1.25 for a motor vehicle with one driver plus ten cents for each additional passenger.