- Mactaquac Dam
The Mactaquac Dam is a hydroelectric
dambuilt on the Saint John Riverin the Canadian province of New Brunswickand operated by NB Powercorporation. Its power house has a capacity of 672 megawatts with its 6 turbines. The 6 turbines generate 20 percent of New Brunswick's power.
The dam and power house are located approximately 15 km upstream from the provincial capital Fredericton. The dam itself is a rock-fill structure sealed by clay and combined with a concrete spill-way, forming an arch across a narrow section of the river between Kingsclear on the west bank, and Keswick Ridge on the east bank.
Rising 40 metres in height above the river level, the reservoir (referred to locally as the "head pond") covers 87 square kilometres and extends 96 kilometres upstream, near Woodstock. The dam and powerhouse are a "run of the river" design, meaning that the reservoir has no additional holding capacity in the event of unusually high water flows, such as during the spring
The concrete portions of the dam (namely the spill-way) are currently experiencing a problem of expanding
concrete. When built, locally quarried greywackewas used as the aggregate and is believed to be responsible for the alkali aggregate reactionexpansion. The dam is being monitored and extra maintenance work is being performed, although the spill-way is expected to have a reduced life expectancy. The earliest projections put the dam's end-of-life at 2013, instead of the original 100-year lifespan of 2068. [ [http://www.cbc.ca/news/story/2000/12/11/nb_tsdam001211.html CBC - Report says Mactaquac Power Station in trouble] ]
Kingsclear, NB is also the site of an
Atlantic Salmon fish hatchery, located immediately downstream from the dam. The Mactaquac Dam also has a fish ladderto enable migratory fish to move past the obstruction the dam poses.
The dam also serves as a locally important public road bridge across the St. John River, linking provincial highways 102 and 105 on the south and north sides of the river.
Flooding of the head pond
Electrical generation began in
1968after the reservoir had completely filled. The flooding of the valley resulted in the displacement of several thousand residents and land owners, as well as the abandonment of a Canadian National Railwayline and numerous local roads and several communities. An historic waterfall was also submerged as the reservoir filled.
The planned town of
Nackawic, New Brunswickand the nearby Ste-Anne-de-Nackawic pulp and papermill were built to accommodate the new reservoir and power opportunities.
Following the success of preserving historic buildings at
Upper Canada Villagewhen the upper St. Lawrence Rivervalley was flooded by the Long Sault Dam, the government of New Brunswick created the King's Landing Historical Settlementto save several buildings which would otherwise have been flooded by the Mactaquac headpond. Mactaquac Provincial Parkwas also created as a result of the dam. The recreational facilities and economic development spawned by the dam are said to be inspired by the Tennessee Valley Authority, which undertook several similar projects in the southern United States.
* [http://www.nbpower.com NB Power Corporation]
* [http://www.mactaquaccountry.com/mactaquacdam.html Mactaquac Country Chamber of Commerce]
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