La Grande Écluse is a Hydraulic construction located in Cap-Saint-Ignace; Montmagny, Quebec and has an elevation of 353 meters.

• Latitude: 46° 56' 38'' North   (decimal: 46.9439111)
• Longitude: 70° 17' 5'' West   (decimal: -70.2847922)
• Topography Feature Category: Hydraulic construction
• Geographical Feature: Barrage
• Canadian Province/Territory: Quebec
• Elevation: 353 meters
• Location: Cap-Saint-Ignace; Montmagny
• Atlas of Canada Locator Map: La Grande Écluse
• GPS Coordinate Locator Map: La Grande Écluse Lat/Long