Barrage Sac-à-Commis is a Hydraulic construction located in Lac-Legendre; Matawinie, Quebec.

• Latitude: 46° 35' 29'' North   (decimal: 46.5914301)
• Longitude: 74° 13' 36'' West   (decimal: -74.2265487)
• Topography Feature Category: Hydraulic construction
• Geographical Feature: Barrage
• Canadian Province/Territory: Quebec
• Location: Lac-Legendre; Matawinie
• Atlas of Canada Locator Map: Barrage Sac-à-Commis
• GPS Coordinate Locator Map: Barrage Sac-à-Commis Lat/Long