Every day, nearly 23 million gallons of oil flow through two aging pipelines in the heart of the Great Lakes, just west of the Mackinac Bridge. Built in 1953 during the Eisenhower administration, the two 20-inch-in-diameter “Line 5” pipelines owned by Canadian company Enbridge, Inc., lie exposed in the water at the bottom of the Straits of Mackinac.
Line 5 Beneath the Straits of Mackinac - Photo courtesy NWF
Enbridge’s pipelines, which run about 1,000 feet apart at depths ranging from 100 - 270 feet, have laid on the bottom of the Straits for more than six decades. Enbridge installed several support structures under the pipelines in 2006 and again in 2010, following the company’s oil spill into the Kalamazoo River - the nation’s largest-ever land-based oil spill. Enbridge officials have said that properly maintained pipelines can last indefinitely, but the company’s history of major spills in Michigan and across North America proves otherwise. Today, much of the oil flowing through the Line 5 pipelines (90 to 95% of it) is coming from Canada and taking a shortcut through Michigan and the Straits of Mackinac before crossing back into Canada near Port Huron.
Support for this campaign is growing exponentially. See the businesses, local governments, tribes, and organizations calling for the shutdown of the flow of oil in Line 5
The pipelines in the Straits of Mackinac cross one of the most ecologically sensitive areas in the world. The Great Lakes are home to 20 percent of the fresh surface water on the planet. The pristine Straits area supports bountiful fisheries, provides drinking water to thousands of people, and anchors a thriving tourism industry with historic and beautiful Mackinac Island right in the center of it all. This area is the definition of Pure Michigan.
Line 5 has spilled 29 times and at least 1.1 million gallons along its length since 1968.
The pipeline has transported crude oil through the Straits of Mackinac without incident until now, but a number of troubling factors are coming together that cause grave concern:
- A recent increase in the volume and pressure of fluids moving through the pipelines
- The tarnished safety record of Enbridge, Inc., the Canadian company that operates the pipeline
- Newly discovered issues of compliance with the contract between the pipeline company and the State of Michigan including 8 known violations
- The age, location, and questionable condition of the pipeline
- The lack of transparency about safety inspections and what petroleum products are being transported through Line 5 in the Great Lakes
- The lack of a proactive regulatory environment in Michigan and at the federal level
- University of Michigan scientists modeled the currents in the Straits of Mackinac and called it "the worst possible place for an oil spill in the Great Lakes."
The Straits of Mackinac is a natural and cultural treasure held by Michigan in trust for its residents. The Straits, which link Lake Michigan and Lake Huron and separate Michigan's Upper Peninsula from its Lower Peninsula, are capable of generating powerful currents that can create a flow of water more than 10 times greater than the flow over Niagara Falls. The strong underwater currents, fierce winds, and extreme winter weather conditions - sometimes including feet-thick ice cover - at the Straits make them ecologically sensitive and would make cleanup or recovery from a pipeline spill especially difficult.
The time is now to fully examine the use of these public waters and Great Lakes bottomlands by a private corporation and to ensure the protection and preservation of the Straits of Mackinac. We all must act now to Keep Oil Out of the Great Lakes.
LINE 5: ONE PIPELINE OF MANY
Enbridge Energy Partners owns and operates a large system of pipelines that carry petroleum products and natural gas fluids to refineries in various destinations, including Texas and other U.S. states, and throughout North America. This crude oil is the raw product that becomes gasoline and other transportation fuels.
Enbridge’s Line 5 is a 645-mile petroleum pipeline that is part of the larger Enbridge Lakehead System. Line 5 carries oil from Superior, Wisconsin, across Michigan’s Upper Peninsula, through northern Michigan, down to the thumb region and under the St. Clair River to Sarnia, Ontario. Along the way, the pipeline crosses through the Straits of Mackinac, multiple rivers and streams, and, in northern Michigan, goes through almost 10 miles of wetlands and runs right next to
many of our sparkling inland lakes. Line 5 is 30 inches in diameter, except when crossing the Straits of Mackinac, where it splits into two 20-inch pipes that lie about 1,000 feet apart. Construction was completed in 1953, and the twin pipelines under the Straits now carry approximately 540,000 barrels, or 22.7 million gallons, of oil and natural gas liquids per day.
In addition to Line 5, the Enbridge Lakehead system includes other pipelines that move through petroleum product across the Great Lakes region. This system of pipelines is the primary transporter of crude oil from western Canada to the United States, with approximately 4,700 miles of pipe and 60 pumping stations serving all the major refineries in the Great Lakes, Midwest, and Ontario. In recent years, as the production of tar sands oil in Canada and crude oil in North Dakota has exploded, there has been a dramatic increase in the number of new pipelines proposed to carry this fuel to refineries and coastal export terminals.
WHAT IT CARRIES & WHERE IT GOES
Line 5 carries synthetic crude oil from Superior, Wisconsin. The original sources are tar sands bitumen from Canada, which has been refined to a “light” oil or “high sour.” Enbridge states that “heavy” diluted bitumen, which is a less refined and more corrosive product that was released into the Kalamazoo River in 2010, does not currently run through Line 5. This pipeline also carries crude oil that originated in the Bakken oil fields of North Dakota.
Line 5 terminates in Sarnia, Canada, just across the St. Clair River from Marysville, Michigan. The pipeline was bored or tunneled just below the river bed. In 2010, adjoining Line 6B was replaced under the St. Clair River after it was found to have a “dent.” Sarnia, Ontario is home to many refineries that produce gasoline and other commercial petroleum products. In short, much of the oil transported through Line 5 originates in western Canada, is shipped through Michigan and the Great Lakes, and refined in Canada for markets back in Canada and overseas.