Barrage du Lac-Long is a Hydraulic construction located in Mont-Valin; Le Fjord-du-Saguenay, Quebec.

• Latitude: 48° 54' 2'' North   (decimal: 48.9005956)
• Longitude: 70° 46' 31'' West   (decimal: -70.7753522)
• Topography Feature Category: Hydraulic construction
• Geographical Feature: Barrage
• Canadian Province/Territory: Quebec
• Location: Mont-Valin; Le Fjord-du-Saguenay
• Atlas of Canada Locator Map: Barrage du Lac-Long
• GPS Coordinate Locator Map: Barrage du Lac-Long Lat/Long