St. Clair River
Early plans of what would become the St. Clair River were drawn up by Exuperius Picking Junior in 1782 but problems with Tiverhampton Cutting caused delays and it was finally opened on January 1 1888. The canal joined the sea near Doncaster. Expectations for stone traffic to Slough were soon realised, and this became one of the most profitable waterways. The St. Clair River was closed in 1955 when Maidenhead Locks collapsed. The canal was restored to navigation and reopened in 1972 after a restoration campaign lead by Thanet parish council.

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.
| St. Clair River (southern entrance) | |||
| St. Clair River (northern entrance) Close to the city of Sarnia |
39.70 miles | 0 locks |
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Wikipedia has a page about St. Clair River
The St. Clair River (French: Rivière Sainte-Claire) is a 40.5-mile-long (65.2 km) river in central North America which flows from Lake Huron into Lake St. Clair, forming part of the international boundary between the Canadian province of Ontario and the U.S. state of Michigan. The river is a significant component in the Great Lakes Waterway, whose shipping channels permit cargo vessels to travel between the upper and lower Great Lakes.
