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The document describes a ship passing through the Soo Locks near Sault Ste. Marie, Michigan. The ship enters the locks and large gates close behind it. "Mules", which are tugboats, guide the ship through the lock channel. Once raised to the higher water level, the front lock doors open and the ship sails through and passes under two bridges before entering Lake Superior. The document mentions there are three types of movable bridges that span the locks: a swinging bridge, an elevator bridge, and a double-leaf bascule bridge.








