Le Haut-Saint-François County, Québec · Water Quality Report Card
Lac Louise
Lac Louise in Le Haut-Saint-François, Québec received a water quality grade of B (Good). Water clarity: 1.4 m visibility. Phosphorus: 13.1 µg/L. Chlorophyll-a (algae): 2.6 µg/L.
- Clarity
- 1.4 m
- Type
- Mesotrophic
Lac Louise is a mesotrophic lake in Le Haut-Saint-François County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 2 other monitored lakes in Le Haut-Saint-François County, Lac Louise ranks #3 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
Good for swimming, clear water with low algae levels
Water Quality Grade: B, Good
Murky, only visible to about 4.6 ft. Phosphorus level: 13.1 µg/L. Chlorophyll-a: 2.6 µg/L. Trophic State Index: 45.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.4 m | D |
| Phosphorus | 13.1 µg/L | A |
| Chlorophyll-a (Algae) | 2.6 µg/L | A |
| Trophic State Index (TSI) | 45 | Mesotrophic |
Moderate nutrients, good water quality
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Fishing Lac Louise
Location
County Ranking
Ranked #3 of 3 lakes in Le Haut-Saint-François
Cleaner Lakes Within 30 Miles
Lac Louise holds Grade B. 5 nearby lakes hold higher grades.
- ALac NicoletArthabaska · 10.7 mi · Higher grade (B → A)
- ALac ElginLe Granit · 5 mi · Higher grade (B → A)
- ALac D'ArgentLe Haut-Saint-François · 9.6 mi · Higher grade (B → A)
- ALac ÉQuerreLe Granit · 11 mi · Higher grade (B → A)
- BLac AylmerLes Appalaches · 7.4 mi · Higher overall water quality score
Nearby Lakes in Le Haut-Saint-François
Explore Lac Louise across LakeGrade
More Québec Lake Rankings
Other Grade B Lakes in Québec
Mesotrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac Louise 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: