Lac Notre-Dame and Usher Lake Association

Water

Tips to keep our water clean

It’s not a garden – don’t dump ashes, fertilizer, or anything at all into the lake. Do cut then remove the invasive Eurasian milfoil. Avoid pulling up weeds or doing anything to stir up the bottom. There are shallow areas choked with milfoil - stay clear of them. Lake Association volunteers place buoys out each sprint to mark areas with heavy milfoil. Your boat motor chops up milfoil into tiny pieces.

Eurasian Milfoil

Originating in Europe, Eurasian watermilfoil is an invasive aquatic plant that usually grows at depths of 1 to 4 metres and can form a dense carpet on the lake’s surface. According to Environment Canada, “this plant not only pushes out indigenous plant species, but may also be harmful to fish populations by crowding out their spawning grounds.” Take steps to reduce weed levels Each broken-off bit of weed can turn into a new plant.

Map of Lacs Notre Dame et Usher

Association water testing locations The red-numbered locations in the lakes on the map show where water is collected for testing. Most locations match where water is either entering or exiting the lakes.

Water testing results

Carol Doré has been volunteering as the Association water tester for years. Thank her when you see her! She collects and tests the water on a regular basis for phosphorus, nitrogen and also for e-coli bacterial contamination. 2017 water testing results summary Phosphate run-off from fertilizers, detergents and waste can act as a fertilizer for plants and algae in the lake, and can reduce the oxygen content. Target levels for Phosphorus in an uncontaminated lake are below .