Barrage du Petit-Lac-William is a Hydraulic construction located in Mandeville; D'Autray, Quebec.

• Latitude: 46° 30' 11'' North   (decimal: 46.5030901)
• Longitude: 73° 26' 40'' West   (decimal: -73.4445772)
• Topography Feature Category: Hydraulic construction
• Geographical Feature: Barrage
• Canadian Province/Territory: Quebec
• Location: Mandeville; D'Autray
• Atlas of Canada Locator Map: Barrage du Petit-Lac-William
• GPS Coordinate Locator Map: Barrage du Petit-Lac-William Lat/Long