Matawinie County, Québec · Water Quality Report Card
Lac de la Belle Montagne
Lac de la Belle Montagne in Matawinie, Québec received a water quality grade of D (Poor). Water clarity: 1.2 m visibility. Phosphorus: 31.1 µg/L. Chlorophyll-a (algae): 27.5 µg/L.
- Clarity
- 1.2 m
- Type
- Eutrophic
Lac de la Belle Montagne is a productive, nutrient-rich eutrophic lake in Matawinie County, Québec. Water quality is graded D based on 3 sampling years through 2025. Compared to the 111 other monitored lakes in Matawinie County, Lac de la Belle Montagne ranks #112 for water quality.
Source: EPA Water Quality Portal sampling records, MELCCFP, last sampled 2025-08-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Swimming not recommended, poor water quality with high algae risk
Water Quality Grade: D, Poor
Murky, only visible to about 3.9 ft. Phosphorus level: 31.1 µg/L. Chlorophyll-a: 27.5 µg/L. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.2 m | D |
| Phosphorus | 31.1 µg/L | C |
| Chlorophyll-a (Algae) | 27.5 µg/L | D |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Lac de la Belle Montagne
Location
County Ranking
Ranked #112 of 112 lakes in Matawinie
Cleaner Lakes Within 30 Miles
Lac de la Belle Montagne holds Grade D. 5 nearby lakes hold higher grades.
- ALac MironMatawinie · 1.5 mi · Two grade letters higher (D → A)
- ALac VertMatawinie · 3.3 mi · Two grade letters higher (D → A)
- ALac ClairMatawinie · 0.8 mi · Two grade letters higher (D → A)
- BLac DanielMatawinie · 3.3 mi · Two grade letters higher (D → B)
- BLac NoirMatawinie · 3.6 mi · Two grade letters higher (D → B)
Nearby Lakes in Matawinie
Explore Lac de la Belle Montagne across LakeGrade
More Québec Lake Rankings
Other Grade D Lakes in Québec
Eutrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac de la Belle Montagne come from the EPA Water Quality Portal. Per-sample source details are not recorded for this lake.
Data Sources
Water quality data from the EPA Water Quality Portal
Grade thresholds from the EPA National Lakes Assessment (EPA 841-R-24-006, Table 6-3), applied by ecoregion
Most recent sample: 2025-08-01
Monitoring stations: