High concentrations of E.coli bacteria colonies are entering the St. Lawrence River in the Montreal area and following the current as far as Lake Saint-Pierre and Trois-Rivières, a recent study found.
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The St. Lawrence River begins as the outflow of the Great Lakes and widens into a large estuary near Ile d'Orléans, where the river's fresh water first encounters oceanic salt water and where the typical two-layer estuarine circulation begins.