Lake Saint-Louis

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Lake Saint-Louis
Location map
Location	Southwestern Quebec
Coordinates	45°24′0″N, 73°49′0″WCoordinates: 45°24′0″N, 73°49′0″W
Primary inflows	Beauharnois Canal, Saint Lawrence River, Ottawa River, Saint-Charles River
Basin countries	Canada
Surface elevation	21 m

For the city in the U.S. State of Missouri, see Lake St. Louis, Missouri.

For other uses of the name "Saint Louis", see Saint Louis.

Lake Saint-Louis (in French Lac Saint-Louis) is a lake in extreme southwestern Quebec, Canada, adjoining the Island of Montreal at the confluence of the Saint Lawrence and Ottawa Rivers. One can actually see a line in the middle of the lake where the two different-coloured waters meet.

The lake is bounded to the north and east by the Island of Montreal and the west by Île Perrot. The town of Beauharnois and the Beauharnois power-dam and canal lie to its south. The lake contains a shipping channel, part of the Saint Lawrence Seaway, joining the South Shore and Beauharnois canals.

Several yacht clubs along the shore of Montreal's West Island make this lake a favourite of Montreal boaters.

To the west, at the lock in Sainte-Anne-de-Bellevue, the lake connects to the Lake of Two Mountains another favourite boating venue and home to the Yacht Club in Hudson.

Although the pollution in the lake has been at its highest in the seventies, many species of fish are part of the vast wildlife of the lake. Among these, the yellow perch, which was overfished in the late eighties, is still one of the most popular fish of the lake.

The lake is also home to the small, privately held Dowker Island.