St. Peters Canal

The St. Peters Canal is a small shipping canal located in eastern Canada on Cape Breton Island. It crosses an isthmus in the village of St. Peter's, Nova Scotia which connects St. Peters Inlet of Bras d'Or Lake to the north with St. Peters Bay of the Atlantic Ocean to the south. In the vast majority of canals the flow of water is unidirectional. That is, the "high" side of the canal is always the same. St. Peter's Canal is unusual in that, due to the difference in the timing of the tides between Bras d'Or Lake and the ocean, during part of the tide cycle the Atlantic side is the higher, in other parts of the tide cycle it is the lake side. As a result, the canal requires special "double" gates, the only ones of their kind in North America. The usual canal lock has a gate at each end, each gate consisting of two swinging doors that when closed form a shallow 'V' shape, with the point of the 'V' pointing upstream. At the St. Peter's Canal lock each gate consists of four swinging doors which form a diamond shape when closed. In actual use the pair of doors which form the upstream pointing 'V' are used. No matter which side has the higher water level, either one pair or the other will be appropriate. Vessels transiting the canal are limited by the size of the lock, which measures 91.44 m (300 ft) long, 14.45 m (47.4 ft) wide, 4.88 m (16 ft) draught and air draught of 32 m (105 ft)

Canal data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).