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After setting our camp, we headed to the Soo Locks in Sault St. Marie on the northern edge of Michigan's Upper Peninsula where Lake Superior empties into Lake Huron. There is a 21 foot drop in St. Mary's River between the two lakes and so the locks lower and raise the ships between the lakes. The "Lakers" are freighters up to 1000' in length and they travel what is referred to as the "Upper Great Lakes." The "Salters" are ships up to 800' which travel the whole way to the ocean. The Lakers are too long to go through the Welland Canal between Lake Erie and Ontario.Below is a relief map of the Upper Lakes showing the depth.
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Unfortunately, we just missed a large freighter going through the locks and none were due for about 8 hours so we watched this tour boat go through the locks and left.
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Above, the boat comes into the lock from Lake Superior and then the lock doors close behind it.
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