The top photo shows us entering the MacArthur Lock, which is part of the Soo Locks of Sault Ste. Marie, Michigan. The Soo Locks help vessels traverse the 21-foot drop from Lake Superior to Lake Huron and the other lower Great Lakes. In the top photo, we are entering the Lock from the south via Lake Huron.
The bottom photo shows how the MacArthur Lock filled with water raising the level to that of the higher Lake Superior. In the top photo, you can barely see the arch of the white Sault Ste Marie International Bridge. In the bottom photo, it is in full view and the lock is almost completely underwater.
Photo captured on October 5, 2016.
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