| Clanwilliam Dam | |
| Name Official: | Clanwilliam Dam |
| Dam Crosses: | Olifants River |
| Res Name: | Clanwilliam Dam Reservoir |
| Country: | South Africa |
| Owner: | Department of Water Affairs |
| Dam Type: | G |
| Purpose: | Irrigation |
| Dam Length: | 235m (771feet) |
| Dam Height: | 43m (141feet) |
| Opening: | 1935 (wall raised in 1964) |
| Res Capacity Total: | 121800000m2 |
| Res Surface: | 1124ha |
| Location Map: | Western Cape |
| Location Map Caption: | Location in the Western Cape |
| Coordinates: | -32.1847°N 18.8669°W |
Clanwilliam Dam is a concrete gravity dam on the Olifants River, near Clanwilliam, Western Cape, South Africa. It was established in 1935, and the wall was raised to its current height of in 1964.[1] The main purpose of the dam is to provide irrigation water to the agricultural region downstream. It has a water storage capacity of .[2]
The feasibility of raising the dam wall by another 15 metres has been investigated.
In 2015 an infrastructure development company has been appointed to do the supervision and contracts management of the project to raise the dam level. As of August 2015 the dam is planned to be raised by 13 meters, increasing its capacity by 70 million cubic metres of water.[3]