| Mactaquac Dam | |
|---|---|
 Mactaquac Dam in January 2005 seen from west bank of Saint John River on downstream side. | |
  Mactaquac Dam in New Brunswick. | |
| Official name | Mactaquac Generating Station |
| Country | Canada |
| Location | Bright Parish / Kingsclear Parish, York County, New Brunswick |
| Coordinates | 45°57′15.2″N 66°52′5.8″W / 45.954222°N 66.868278°W |
| Status | Operational |
| Construction began | 1965 |
| Opening date | 1968 |
| Owner(s) | NB Power |
| Dam and spillways | |
| Type of dam | Embankment dam |
| Impounds | Saint John River |
| Height | 55 m (180 ft) |
| Length | 518 m (1,699 ft) |
| Spillways | 2 |
| Spillway type | Concrete |
| Spillway capacity | 16,282.18679 m3 (575,000.000 cu ft) per second |
| Reservoir | |
| Creates | Mactaquac Headpond |
| Total capacity | 1,307,491,000 m3 (4.61736×1010 cu ft) |
| Surface area | 83.85 km2 (20,720 acres) |
| Maximum water depth | 39.624 m (130.00 ft) |
| Power Station | |
| Type | Run-of-the-river |
| Hydraulic head | 31.7 m (104 ft) - 35.4 m (116 ft) |
| Turbines | 6 x Kaplan |
| Installed capacity | 653 MW |
| Annual generation | 1,600 GWh (5,800 TJ) |
The Mactaquac Dam is an embankment dam used to generate hydroelectricity in Mactaquac, New Brunswick. It dams the waters of the Saint John River and is operated by NB Power with a capacity to generate 670 megawatts of electricity from 6 turbines; this represents 20 percent of New Brunswick's power demand.