Grootdraai Dam is a combined gravity and earth-fill type dam located on the Vaal River, near Standerton, Mpumalanga, South Africa. It was established in 1981. Grootdraai Dam is a composite structure comprising a central concrete gravity section 360 m long and two earthfill flanks giving a total crest length of 2180 m and a maximum wall height of 42 m above lowest foundation level. The dam was completed in 1982 and was built primarily to support the water needs of the SASOL I, II and III coal to petrol plants at Secunda, ESKOM's Tutuka Power Station as well as the Matla Power Station, Duvha Power Station, Kendal Power Station and Kriel Power Station located on the coal fields in the adjacent Olifants River basin.