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Our lakes


The Charlebois and Des Sommets lakes are located in the town of Ste-Marguerite-du-lac-Masson, in the Laurentians.

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Our lakes watershed

The Ministry of Sustainable Development, Environment and Parks divides the lakes, rivers and streams by watershed. These watersheds are grouped by hydrographic regions. Each of the hydrographic regions have accredited organizations that are subsidized by the government of Quebec. Their primary mandate is to develop a water master plan, with a clear picture and diagnosis of watershed issues, policies and objectives and a plan of action to be realized by signing of watershed contracts .

Lakes Des Sommets and Charlebois are part of the watershed of the Assumption river.

CARA is: Corporation d’amenagement de la Riviere l’Assomption is the official representative of the watershed with the ministry. The water system is as follows: Des Sommets lake empties into Charlebois lake, which flows into lac des Iles, which empties into the river Jean-Venne, which empties into the river Ouareau, which empties into the Assomption river. The Assomption river finally empties into the St-Lawrence river.


Bathymetric maps

Noticing that there was not much information describing the morphometry of these lakes, the Regional Council for the Environment partnered up with Richard Carignan (Biology Station of the Laurentians – University of Montreal), in order to create the bathymetric(*) maps for the Laurentians’ Lakes, for the summer of 2010.

Around the same time, a project called Bleu Laurentides was in progress, and one of the aspects of this initiative was a complementary follow-up on the water quality of the lakes of the region. This, combined with the “Bathymetric Project”, resulted in the bathymetric analysis of over 45 lakes in the summer of 2010. Based on the data collected, bathymetric maps were created and are available to you on this web site. These maps are a great tool when it comes to determining the precise area, volume, the mean and maximal depth of the lakes. They also provide valuable knowledge on the area of the watershed of the lake, an essential piece of information to understand the current state of our lakes. .

*A bathymetric chart is the submerged equivalent of an above-water topographic map. Bathymetric charts are designed to present accurate, measurable description and visual presentation of the submerged terrain

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Selection criteria

During the summer of 2010, the lakes were carefully selected according to the following criteria: Be located in the territory of one of the five partner RCMs of the Bleu Laurentides project: Antoine-Labelle, Laurentides, Pays-d’en-Haut, Argenteuil, and Rivière-du-Nord;); Be part of the Reseau de surveillance volontaire des lacs (RSVL) of the MDDEP; Possess no bathymetric map; Possess a poor quality bathymetric map; Be a lake for which the acquisition of new hydrological information was judged necessary by the project leaders;

Prioritization criteria

Furthermore, the lakes were prioritized depending on the following items: Their location on the territory of a municipality that takes part, or has taken part, in the Technical Support Program of the lakes of Bleu Laurentides. The availability of the members of the association, the accessibility to a water embarkation or an easy access to the lake.

The charts