| Grahamstown Dam | |
|---|---|
 | |
  Location of the Grahamstown Dam in New South Wales | |
| Country | Australia |
| Location | Ferodale, New South Wales |
| Coordinates | 32°44′S 151°49′E / 32.733°S 151.817°E |
| Purpose | Water supply |
| Status | Operational |
| Construction began | 1955 |
| Opening date | 1969 |
| Owner(s) | Hunter Water |
| Dam and spillways | |
| Type of dam | Embankment dam |
| Impounds | Off-stream |
| Height | 12 metres (39 ft) |
| Length | 4.8 km (3 mi) |
| Dam volume | 2,124 m3 (75,008 cu ft) |
| Spillways | 1 |
| Spillway type | Controlled labyrinth spillway and baffle chute |
| Spillway capacity | 800 cubic metres per second (28,000 cu ft/s) |
| Reservoir | |
| Creates | Grahamstown Lake |
| Total capacity | 190,000 megalitres (6,700×106 cu ft) |
| Catchment area | 97 km2 (37 sq mi) |
| Surface area | 2,460 ha (6,079 acres) |
| Website Hunter Water | |
Grahamstown Dam is a major off-stream earthfill Embankment dam with a controlled labyrinth spillway and baffle chute that stores water from the Williams River. The dam is located north of Newcastle, New South Wales, Australia. The dam's main purpose is water supply; it provides about 40 per cent of the potable water for the Hunter Region; and is its largest drinking water supply dam.
The impounded reservoir is called Grahamstown Lake or the Grahamstown Storage Reservoir.