The Straits of Mackinac Shipwreck Preserve are divided in two by a bridge spanning how long?
Straits of Mackinac Shipwreck Preserve The Straits of Mackinac Shipwreck Preserve is a 148 sqmi state preserve in and around the Straits of Mackinac. The preserve is divided in two by the Mackinac Bridge. The waters of the preserve include the waters offshore from Mackinaw City and St. Ignace, as well as all or part of the shorelines of Bois Blanc Island, Mackinac Island, Round Island, and St. Helena Island.
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.