I've added more pictures of our trip to the Sault St. Marie Locks. If you notice the water marks on the sides of the locks, it shows the height the water raises the boat to before you can move into Lake Superior because of the difference in heights between Lake Huron and Lake Superior. On the way back to Lake Huron through the lock our boat was lowered. The first lock was opened in 1855. There is no cost to pass through the locks. I also have a picture of a steel mill over in Canada. It uses coal from the coal mines in West Virginia and iron ore from Michigan.
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