"TRAVERSE CITY, Mich. — A freshwater channel that separates Michigan's upper and lower peninsulas is a premier Midwestern tourist attraction and a photographer's delight, offering spectacular vistas of two Great Lakes, several islands and one of the world's longest suspension bridges. But nowadays the Straits of Mackinac is drawing attention for something that is out of sight and usually out of mind, and which some consider a symbol of the dangers lurking in the nation's sprawling web of buried oil and natural gas pipelines."
"Stretched across the bottom of the waterway at depths reaching 270 feet are two 20-inch pipes that carry nearly 23 million gallons of crude oil daily. They are part of the 1,900-mile Lakehead network, which originates in North Dakota near the Canadian border. A segment known as Line 5 slices through northern Wisconsin and Michigan's Upper Peninsula before ducking beneath the Straits of Mackinac and winding up in Sarnia, Ontario."