Lake Superior (Northern route)
The Lake Superior (Northern route) was built by Thomas Dadford and opened on 17 September 1876. The Lake Superior (Northern route) was closed in 1905 when Pembroke Cutting collapsed. "500 Miles on The Inland Waterways" by Oliver Thomas describes an early passage through the waterway, especially that of Polebury Aqueduct.

The exact dimensions of the largest boat that can travel on the waterway are not known. The maximum headroom is not known. The maximum draught is not known.
| Lake Superior Entrance | |||
| Terrace Bay | 197.70 miles | 0 locks | |
| Thunder Bay | 291.17 miles | 0 locks | |
| Silver Bay | 441.64 miles | 0 locks | |
| Two Harbors | 479.46 miles | 0 locks | |
| Duluth | 515.52 miles | 0 locks |
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Wikipedia has a page about Lake Superior
Lake Superior is the largest of the Great Lakes of North America, and among freshwater lakes, it is the world's largest by surface area and the third-largest by volume. It is shared by Ontario to the north, Minnesota to the west, and Wisconsin and the Upper Peninsula of Michigan to the south. Lake Superior is the most northerly and most westerly of the Great Lakes chain, and the highest in elevation, draining into Lake Huron via St. Mary's River .
