Barrage Gagnon is a Hydraulic construction located in Lac-Pythonga; La Vallée-de-la-Gatineau, Quebec.

• Latitude: 46° 47' 9'' North   (decimal: 46.7858947)
• Longitude: 76° 31' 19'' West   (decimal: -76.5219063)
• Topography Feature Category: Hydraulic construction
• Geographical Feature: Barrage
• Canadian Province/Territory: Quebec
• Location: Lac-Pythonga; La Vallée-de-la-Gatineau
• Atlas of Canada Locator Map: Barrage Gagnon
• GPS Coordinate Locator Map: Barrage Gagnon Lat/Long