Ottawa Invokes 1977 Pipeline Treaty in Separate Line 5 Dispute, This One in Wisconsin

This June 29, 2018 photo shows tanks at the Enbridge Energy terminal in Superior, Wis. The Canadian Press/AP-Jim Mone

For the second time in a year, the federal government is invoking a little-known 1977 energy treaty between Canada and the United States to defend the Line 5 pipeline.

This time, it’s in Wisconsin, where Line 5 skirts the southwestern shores of Lake Superior before crossing into Michigan.