Lake Onslow
| Lake Onslow | |
|---|---|
Lake Onslow In May 2014 | |
| Location | Otago, South Island |
| Coordinates | 45°33′S 169°37′E / 45.550°S 169.617°E |
| Type | reservoir |
| Primary inflows | Teviot River |
| Primary outflows | Teviot River |
| Basin countries | New Zealand |
| Surface elevation | 700 m (2,300 ft) |
Lake Onslow is a man-made lake east of Roxburgh and south of Alexandra in the Otago region of New Zealand. It lies 700 m (2,300 ft) above sea level. It was formed in 1890 by the damming of the Teviot River and Dismal Swamp, with a new dam built in 1982 that raised the lake level by 5 m (16 ft). It has been considered as the site for a pumped-storage hydroelectricity project.