| Saint-Louis River | |
|---|---|
 | |
| Location | |
| Country | Canada |
| Province | Quebec |
| Region | Montérégie |
| MRC | Beauharnois-Salaberry |
| Physical characteristics | |
| Source | Marshes and agricultural streams |
| • location | Sainte-Barbe |
| • coordinates | 45°08′17″N 74°13′10″W / 45.138095°N 74.219476°W |
| • elevation | 48 |
| Mouth | Lake Saint-Louis |
• location | Beauharnois |
• coordinates | 45°18′55″N 73°52′49″W / 45.31528°N 73.88028°W |
• elevation | 26 m (85 ft) |
| Length | 30.3 km (18.8 mi) |
| Basin features | |
| Tributaries | |
| • left | (from the mouth) discharge Saint-Louis |
| • right | (from the mouth) Vinet stream, Jos.-Montpelier stream, Saint-Édouard stream, Georges-Vinet stream, Himbault stream, E.-Caron stream, Lafontaine stream, Legault-Daigneault descent, Longtin stream, Brisson stream, Bell stream, Saint outlet -Louis, Donohoe Creek. |
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The Saint-Louis river is a tributary of the south shore of the Saint Lawrence River. This river flows through the municipalities of Sainte-Barbe, Saint-Stanislas-de-Kostka, Saint-Louis-de-Gonzague, Saint-Étienne-de-Beauharnois and Beauharnois, in the Beauharnois-Salaberry Regional County Municipality, in the administrative region of Montérégie, in the Southwest of province of Quebec, in Canada.