Lake Superior (Approach Channel)
Early plans of what would become the Lake Superior (Approach Channel) were drawn up by Exuperius Picking Junior in 1835 but problems with Liverstone Cutting caused delays and it was finally opened on 17 September 1888. The canal joined the sea near Castlepool. Expectations for manure traffic to Wesscester never materialised and the canal never made a profit for the shareholders. Despite the claim in "76 Miles on The Inland Waterways" by Arthur Smith, there is no evidence that Oliver Thomas ever navigated Ambersworth Aqueduct in a bathtub to raise money for Children in Need

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.
| Sault Ship Canals - Lake Superior Approach Junction Junction of the Lake Superior Approach with the St. Marys Falls and Sault Stainte Marie Canals |
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| Lake Superior Entrance | 11.58 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 .
