TRAVERSE CITY, Mich. (AP) — Some environmental groups are asking Michigan Gov. Rick Snyder to get state government more directly involved in efforts to determine the condition of an oil pipeline beneath the Straits of Mackinac and to guard against spills.

More than a dozen organizations signed a letter contending Snyder has the power to demand answers from Enbridge Energy Partners LP about the line, which was laid in 1953. It is part of the 1,900-mile Lakehead network, which originates in North Dakota near the Canadian border. A segment known as Line 5 runs through northern Wisconsin and Michigan’s Upper Peninsula before ducking beneath the Straits of Mackinac and winding up in Sarnia, Ontario.