Les Trois Lacs
Arthabaska, QuébecView mapDirections
This is MELCCFP's own trophic classification for 2024, not a LakeQuality grade. See every year
- 28 ft max depth
Les Trois Lacs in Arthabaska, Québec is classified classe eutrophe by Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (Québec) for 2024. Water clarity: 1.4 m visibility. Phosphorus: 30.2 µg/L. Chlorophyll-a (algae): 8 µg/L.
Les Trois Lacs is a lake in Arthabaska County, Québec with an estimated average depth of about 28 feet.
Source: Québec RSVL (MELCCFP) — not the EPA Water Quality Portal, last sampled 2024-08-01. Methodology: how these readings are compared.
Swimming conditions
No readingNot rated
Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
Whether Les Trois Lacs is safe to swim in today is a call for le Ministère de l'Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs and the county health department, who post current advisories. LakeQuality does not issue swimming clearances.
Water quality measurements for Les Trois Lacs
These are the measurements MELCCFP publishes for Les Trois Lacs, shown as reported. The condition class beside each reading is the EPA National Lakes Assessment class for this lake’s ecoregion.
Murky, only visible to about 4.6 ft. Phosphorus 30.2 µg/L. Chlorophyll-a 8 µg/L.
| Measure | Reading | Where it sits |
|---|---|---|
| Water clarity (Secchi depth) | 1.4m | Measured, not scored How deep a black-and-white disk stays visible from the surface. Higher is clearer. |
| Total phosphorus | 30.2µg/L | Measured, not scored The nutrient that most limits algae growth in freshwater. More phosphorus, more algae potential. |
| Chlorophyll-a (algae) | 8µg/L | Measured, not scored The green pigment in algae — a direct measure of how much algae is in the water. |
Ask about Les Trois Lacs
Answers come straight from the public measurements and survey records on this page.
Lake Details
Max depth
~8.5 m est.
Depth marked “est.” is a modeled maximum from GLOBathy (Khazaei et al. 2022, CC0), not a measured survey. Québec has not published bathymetry for Les Trois Lacs.
Lake Size & Watershed
Watershed (drainage) area
197 sq mi
HydroLAKES / HydroSHEDS
Surface area
598 acres
HydroLAKES / HydroSHEDS
Shoreline
10 mi
HydroLAKES / HydroSHEDS
Elevation
525 ft
Size, shoreline, and watershed area from HydroLAKES (HydroSHEDS). Mean depth here is modelled, not surveyed — HydroLAKES v1.0 estimates lake depth from surrounding terrain rather than from soundings. Treat it as an approximation, and prefer a state bathymetric survey where one exists.
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Frequently asked questions about Les Trois Lacs
Where is Les Trois Lacs?
- Les Trois Lacs is a lake in Arthabaska, Québec. MELCCFP classifies it classe eutrophe for 2024. This is MELCCFP's own trophic classification for 2024, not a LakeQuality grade.
What is the water quality of Les Trois Lacs?
- Les Trois Lacs in Arthabaska, Québec is classified classe eutrophe by Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (Québec) for 2024. Water clarity: 1.4 m visibility. Phosphorus: 30.2 µg/L. Chlorophyll-a (algae): 8 µg/L.
Is Les Trois Lacs safe to swim in?
- Nutrient and algae readings are not a swimming clearance. Check local advisories before you swim.
How deep is Les Trois Lacs?
- No published bathymetric survey covers Les Trois Lacs, so its depth has not been measured. The HydroLAKES global model estimates an average depth of about 28 feet, but that is a modelled estimate derived from surrounding terrain rather than a measurement on the water, so treat it as approximate.
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The authority’s own classification
Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (Québec) publishes its own classification for Les Trois Lacs. It is shown here as theirs, in their words, and is not folded into the LakeQuality letter.
This is MELCCFP's own trophic classification for 2024, not a LakeQuality grade.
A trophic class ranks how nutrient-rich a lake is, from oligotrophic at the low end to eutrophic at the high end. It describes nutrients and plant growth, not bacteria, and it is not a swimming clearance.
Earlier years (10 classified 2011–2024)
| Year | Published class |
|---|---|
| 2023 | zone de transition méso-eutrophe |
| 2022 | zone de transition méso-eutrophe |
| 2021 | classe eutrophe |
| 2019 | classe eutrophe |
| 2018 | classe eutrophe |
| 2014 | classe eutrophe |
| 2013 | classe eutrophe |
| 2012 | zone de transition méso-eutrophe |
| 2011 | zone de transition méso-eutrophe |
Published by Ministère de l’Environnement, de la Lutte contre les changements climatiques, de la Faune et des Parcs (Québec). A classification is not a same-day swimming clearance. See data sources.
Where this data comes from
Measurements for Les Trois Lacs come from the Réseau de surveillance volontaire des lacs (RSVL), not the EPA Water Quality Portal. Per-sample source details are not recorded for this lake. MELCCFP RSVL (CC BY 4.0). See data sources.
Other records on this page
Lake size & watershed from HydroLAKES (HydroSHEDS)