 The study found that 3,528 square miles (15%) of Lake Michigan's open water and roughly 13,611 square miles (60%) of Lake Huron's open water could be impacted by visible oil.In addition, highly turbulent flowing currents found within the Straits of Mackinac, combined with the degrading enzymes secreted by zebra mussels, and aging pipe welds and coal tar enamel, increases the risk for corrosion and potential fissures to occur in the pipes.Due to these issues, expert reports concluded that Line 5 should be shut down in the Straits pending a full review under state public trust law.