The Lac Carson dam in Grenville-sur-la-Rouge is about to become a lot shorter.

The dam is approximately 20 feet high and will be reduced to an approximate height of six feet, according to Grenville-sur-la-Rouge Mayor Tom Arnold.

Lac Carson was expropriated by the village of Grenville in the 1970’s for use as a water reservoir and a higher dam was constructed to increase the water capacity in the lake. However, the village now uses wells and not the lake as its source of water and the dam needs repairs.

In February 2021, the village and municipality of Grenville-sur-la-Rouge began studies to determine the best option for repairing the dam and preserving the lake.

“It will not be demolished,” said Grenville village Mayor Pierre Thauvette.

The height of the dam will be lowered, but it will preserve Lac Carson.

Lac Carson existed before the dam was built, but its use as a reservoir has eliminated its ability to hold water if there is no dam in place, which is why Grenville-sur-la-Rouge wants to lower the height of the dam to keep the water behind it.

“If we don’t do it, then the lake will disappear,” said Grenville-sur-la-Rouge Mayor Tom Arnold.

According to Arnold, the entire dam project will cost approximately $25,000 and 66 per cent of the cost will be paid for by the Québec government.  Grenville-sur-la-Rouge and the village of Grenville will each cover 50 per cent of the remaining cost.  Grenville-sur-la-Rouge is also assuming ownership of the dam and lake which is surrounded by private property and is only accessible by a private road from chemin Scotch, north of Autoroute 50.