Blackstrap Lake is a man-made lake in central Saskatchewan, Canada, south of Saskatoon in the rural municipality of Dundurn No. 314. The lake was created as a reservoir in 1967 as part of the Saskatoon South East Water Supply System. Blackstrap Lake has an area of 1,200 hectares (3,000 acres) (14.4 km x 0.8-1.2 km at a depth of 5.14 m) and is used to support irrigation, industrial and municipal water supply.