Barrage du Trente-et-Un-Milles is a Hydraulic construction located in Sainte-Thérèse-de-la-Gatineau; La Vallée-de-la-Gatineau, Quebec.

• Latitude: 46° 16' 34'' North   (decimal: 46.2761655)
• Longitude: 75° 48' 12'' West   (decimal: -75.8032773)
• Topography Feature Category: Hydraulic construction
• Geographical Feature: Barrage
• Canadian Province/Territory: Quebec
• Location: Sainte-Thérèse-de-la-Gatineau; La Vallée-de-la-Gatineau
• Atlas of Canada Locator Map: Barrage du Trente-et-Un-Milles
• GPS Coordinate Locator Map: Barrage du Trente-et-Un-Milles Lat/Long