St. Marys River
Early plans of what would become the St. Marys River were drawn up by Cecil Green in 1782 but problems with Aberdeenshire Embankment caused delays and it was finally opened on 17 September 1816. Expectations for stone traffic to Rotherham never materialised and the canal never made a profit for the shareholders. Although proposals to close the St. Marys River were submitted to parliament in 1990, the use of the canal for cooling Plymouth power station was enough to keep it open. "I Wouldn't Moor There if I Were You" by Oliver Jones describes an early passage through the waterway, especially that of Canterbury 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.
It has a junction with the North Channel Lake at St. Marys River - St. Joseph Channel Junction.
| St. Marys River - Lake Huron Junction | |||
| St. Marys River - St. Joseph Channel Junction | 51.53 miles | 0 locks | |
| St. Marys River - Old Channel Junction | 78.42 miles | 0 locks | |
| Sault Ship Canals - St. Marys River Junction Junction of the St. Marys River with the St. Marys Falls and Sault Stainte Marie Canals |
80.85 miles | 0 locks |
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Wikipedia has a page about St. Marys River
The St. Marys River, St. Mary's River, or St. Mary River may refer to:
