One the great tourist "to do's" is a boat ride through the Soo Locks. For only $25 you travel up the St. Mary's River into the locks and then into the Lake Superior side of the river. You then go up river a bit get closer to the Canadian side of the river and back through the locks again. This point of the river has a 21 ft drop from the Lake Superior side to the Lake Huron side of the river. There are actually 4 parallel lock chambers but two have been shut down and only the Poe and MacArthur locks still in use. The largest of the two, the Poe, is over 1,000 ft long and 100+ ft wide thus allowing the largest of the cargo ships to pass. Of particular interest is that the ship's captain pilots these huge vessels into the locks without the use of a channel pilot or tug boat like would be used in coastal shipping. In about 15 minutes the water level rises or drops 21 feet all due to the power of gravity. No pumps are used or needed to fill or empty the lock chamber. Here are the photos.
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