Mactaquac Dam

Mactaquac Dam
Mactaquac Dam in January 2005 seen from west bank of Saint John River on downstream side.
Mactaquac Dam is located in New Brunswick
Mactaquac Dam
Mactaquac Dam in New Brunswick.
Official nameMactaquac Generating Station
CountryCanada
LocationBright Parish / Kingsclear Parish, York County, New Brunswick
Coordinates45°57′15.2″N 66°52′5.8″W / 45.954222°N 66.868278°W / 45.954222; -66.868278
StatusOperational
Construction began1965; 59 years ago (1965)
Opening date1968; 56 years ago (1968)
Owner(s)NB Power
Dam and spillways
Type of damEmbankment dam
ImpoundsSaint John River
Height55 m (180 ft)
Length518 m (1,699 ft)
Spillways2
Spillway typeConcrete
Spillway capacity16,282.18679 m3 (575,000.000 cu ft) per second
Reservoir
CreatesMactaquac Headpond
Total capacity1,307,491,000 m3 (4.61736×1010 cu ft)
Surface area83.85 km2 (20,720 acres)
Maximum water depth39.624 m (130.00 ft)
Power Station
TypeRun-of-the-river
Hydraulic head31.7 m (104 ft) - 35.4 m (116 ft)
Turbines6 x Kaplan
Installed capacity653 MW
Annual generation1,600 GWh (5,800 TJ)
Mactaquac Dam with the spillways open, April 2017.

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.