Carlos Osorio/APFILE - This July 19, 2002, file photo, shows the Mackinac Bridge that spans the Straits of Mackinac from Mackinaw City, Mich. Oil transport company Enbridge says Wednesday, a gap has opened between a section of its Line 5 pipeline and the lake bottom in Michigan's Straits of Mackinac. Erosion has washed away sediments beneath the pipeline, opening a gap that exceeds the 75-foot limit set under a state easement. The company says it's awaiting government permits to install screw anchors for additional support in that spot and others along the underwater line. (AP Photo/Carlos...…Carlos Osorio/APFILE - This July 19, 2002, file photo, shows the Mackinac Bridge that spans the Straits of Mackinac from Mackinaw City, Mich. Oil transport company Enbridge says Wednesday, a gap has opened between a section of its Line 5 pipeline and the lake bottom in Michigan's Straits of Mackinac. Erosion has washed away sediments beneath the pipeline, opening a gap that exceeds the 75-foot limit set under a state easement. The company says it's awaiting government permits to install screw anchors for additional support in that spot and others along the underwater line. (AP Photo/Carlos...WW…