And when it crosses from Michigan's Upper Peninsula to its Lower Peninsula, the line splits into two parallel pipes that run along the bottom of the Straits of Mackinac, which connect Lake Michigan and Lake Huron. Shutting down Line 5 in Michigan In 2021, Michigan Gov. Gretchen Whitmer revoked Enbridge's easement to operate the pipeline across the Straits of Mackinac. The governor asserted that Enbridge"repeatedly violated the 1953 easement and that the continued operation of the dual pipelines violates the state's solemn duty to protect the Great Lakes ." Some of her concerns exist because the pipeline sits in the open water of the Great Lakes and has been damaged multiple times by ship's anchors, is subject to corrosion, and has been found to be bent and deformed by the extremely powerful currents in the Straits of Mackinac. Enbridge refused to comply with the shutdown order and has taken the battle into the courts while continuing to send petroleum products through the pipeline across the straits.