Mauricie County, Québec · Water Quality Report Card
Lac Alphonse
Lac Alphonse in Mauricie, Québec received a water quality grade of A (Excellent). Water clarity: 5.3 m visibility. Phosphorus: 3.5 µg/L. Chlorophyll-a (algae): 1.4 µg/L.
- Clarity
- 5.3 m
- Type
- Oligotrophic
Lac Alphonse is a cold, clear oligotrophic lake in Mauricie County, Québec. Water quality is graded A based on 3 sampling years through 2024. Compared to the 7 other monitored lakes in Mauricie County, Lac Alphonse ranks #2 for water quality.
Source: EPA Water Quality Portal sampling records, MELCCFP, last sampled 2024-08-01. Grade methodology: LakeGrade methodology.
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Swimming Safety
Excellent for swimming, crystal clear water with minimal algae
Water Quality Grade: A, Excellent
Crystal clear, you can see 17.4 ft down. Phosphorus level: 3.5 µg/L. Chlorophyll-a: 1.4 µg/L. Trophic State Index: 31.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 5.3 m | A |
| Phosphorus | 3.5 µg/L | A |
| Chlorophyll-a (Algae) | 1.4 µg/L | A |
| Trophic State Index (TSI) | 31 | Oligotrophic |
Low nutrients, clear water, excellent for swimming
Where to stay near Lac Alphonse
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Fishing Lac Alphonse
Location
County Ranking
Ranked #2 of 8 lakes in Mauricie
Nearby Lakes in Mauricie
Explore Lac Alphonse across LakeGrade
More Québec Lake Rankings
Other Grade A Lakes in Québec
Oligotrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac Alphonse 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: 2024-08-01
Monitoring stations: