List of initiatives related to the health of the lake


Since its beginning, the Association du Lac Mercier has always been focused on the protection of the environment, and numerous initiatives were undertaken to protect the quality and the health of the lake.

  • Cooperation with organizations devoted to the protection of the environment, especially that of lakes, of which:

-Programme des Lacs (1989-1992) sponsored by the Ministry of the Environment of Quebec (ceased activities in 1992)

-Member of the FAPEL (1989-2002) (the organization has ceased activities recently)

-Conseil Régional en Environnent des Laurentides (CRELA) since 1995

  • Request to the municipality for a limnology study (2000)
  • Surveillance of “milfoil” growth (since 2003)
  • Request for city interventions to limit the spread of milfoil (washing of boats, identification of growth clusters, etc) since 2003
  • Commissioning of three studies of the littoral zone, measuring the quality of the lake water, by Louise St-Cyr, biologist (2003, 2007 and 2008)
  • Identification of measures to contain and limit the deposition of phosphorus in the lake, following the appearance of blue algae growth  (cyanobacteria) in 2007
  • Collaboration with the Department of the Environment of the city, in their program of evaluating the quality of Lac Mercier (2004)
  • Participation in the Volunteer Lake-Monitoring Program  (VLMP)
  • An environmental analysis of the tributary streams flowing into lac Mercier, scheduled for 2011, has been postponed.
  • In August 2008, the association sponsored an “Evaluation of the littoral zone of lac Mercier”. The study biologist, Louise St-Cyr, identified several dense mats of invasive plants (Eurasian water milfoil, Broad-leaved Pondweed, Elodea). Two large dense mats, composed mostly of Eurasian water milfoil, were identified:

– One dense cluster located near the rock island in front of the public beach

– One dense cluster in the north-west portion of the lake

– Several smaller growths were also found mostly in the southern part of the lake

The study concluded that there were invasive plants in 6 of the 9 sectors that were sampled.

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