Detroit Free Press | Study: A Straits oil spill could impact 700 miles of coastline Detroit Free Press If Canadian oil transport giant Enbridge's twin, 62-year-old underwater pipelines in the Straits of Mackinac were to burst, areas from Harbor Springs on the Lake Michigan side down to Saginaw Bay and the Thumb area on the Lake Huron side could be ... 700 miles of shoreline at risk from Mackinac straits oil spill |