La salinite de l'eau / The Water Salinity

At Saint-François-de-l'Île-d'Orléans, opposite Berthier-sur-Mer, the St. Lawrence River reaches its maximum tidal amplitude of nearly 7 meters, the difference in water height between low tide and high tide. At Sept-Îles in the Gulf of St. Lawrence, the tide is 3 meters, while at Trois-Rivières it varies by about 30 centimetres. Downstream from Île d'Orléans, opposite Berthier-sur-Mer, the river is only beginning to become salt water at about 25 percent salinity; the salt content then increases gradually into the estuary, and by Kamouraska the river is completely salt water.

Quebec · Canada