Question: The Straits of Mackinac Shipwreck Preserve are divided in two by a bridge spanning how long?
Sentence (from "Mackinac Bridge"): 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.
Relevant evidence: No