In 2013, Enbridge upgraded pumps along Line 5 and increased the product flow under the Straits by 10 percent from 490,000 to 540,000 barrels per day, or 2.1 million gallons per day. 

A recent animated video by the University of Michigan and the National Wildlife Federation shows how devastating an oil spill beneath the Straits of Mackinac would be for the Great Lakes, wildlife, and communities. The animation shows that if an oil spill occurs, oil could reach popular tourist destinations like Mackinac Island, blanket 50 miles of Lake Huron shoreline, and reach Lake Michigan landmarks such as Beaver Island.

The University of Michigan research scientist says that "one million gallons is conservatively the amount of oil that resides in the pipelines in the Straits at any time.”

Watch how spilled oil could spread across the Straits

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