Barrage Custeau is a Hydraulic construction located in Lac-Achouakan; Lac-Saint-Jean-Est, Quebec.

• Latitude: 48° 3' 59'' North   (decimal: 48.0664317)
• Longitude: 71° 31' 23'' West   (decimal: -71.5231577)
• Topography Feature Category: Hydraulic construction
• Geographical Feature: Barrage
• Canadian Province/Territory: Quebec
• Location: Lac-Achouakan; Lac-Saint-Jean-Est
• Atlas of Canada Locator Map: Barrage Custeau
• GPS Coordinate Locator Map: Barrage Custeau Lat/Long