Barrage à l'Oignon is a Hydraulic construction located in Franquelin; Manicouagan, Quebec.

• Latitude: 49° 23' 55'' North   (decimal: 49.3986574)
• Longitude: 67° 52' 18'' West   (decimal: -67.8716801)
• Topography Feature Category: Hydraulic construction
• Geographical Feature: Barrage
• Canadian Province/Territory: Quebec
• Location: Franquelin; Manicouagan
• Atlas of Canada Locator Map: Barrage à l'Oignon
• GPS Coordinate Locator Map: Barrage à l'Oignon Lat/Long