La Mitis County, Québec · Water Quality Report Card
Lac du Gros Ruisseau
Lac du Gros Ruisseau in La Mitis, Québec received a water quality grade of B (Good). Water clarity: 3.4 m visibility. Phosphorus: 18.6 µg/L. Chlorophyll-a (algae): 5.4 µg/L.
- Clarity
- 3.4 m
- Type
- Mesotrophic
Lac du Gros Ruisseau is a mesotrophic lake in La Mitis County, Québec. Water quality is graded B based on 3 sampling years through 2025.
Source: EPA Water Quality Portal sampling records, MELCCFP, last sampled 2025-08-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Good clarity, visible to about 11 ft. Phosphorus level: 18.6 µg/L. Chlorophyll-a: 5.4 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 3.35 m | B |
| Phosphorus | 18.6 µg/L | A |
| Chlorophyll-a (Algae) | 5.4 µg/L | B |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Lac du Gros Ruisseau
Location
County Ranking
Ranked #1 of 1 lakes in La Mitis
Cleaner Lakes Within 30 Miles
Lac du Gros Ruisseau holds Grade B. 3 nearby lakes hold higher grades.
- ALac à GasseRimouski-Neigette · 12.7 mi · Higher grade (B → A)
- ALac NoirRimouski-Neigette · 13.1 mi · Higher grade (B → A)
- ALac du QuinzièMe MilleLa Matapédia · 14.6 mi · Higher grade (B → A)
Nearby Lakes in La Mitis
Explore Lac du Gros Ruisseau across LakeGrade
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Other Grade B Lakes in Québec
Mesotrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac du Gros Ruisseau 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: