D'Autray County, Québec · Water Quality Report Card
Lac Lewis
Lac Lewis in D'Autray, Québec received a water quality grade of B (Good). Water clarity: 2.1 m visibility. Phosphorus: 18 µg/L. Chlorophyll-a (algae): 14.3 µg/L.
- Clarity
- 2.1 m
- Type
- Eutrophic
Lac Lewis is a productive, nutrient-rich eutrophic lake in D'Autray County, Québec. Water quality is graded B based on 3 sampling years through 2025. Compared to the 13 other monitored lakes in D'Autray County, Lac Lewis ranks #12 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
Moderate clarity, visible to about 6.7 ft. Phosphorus level: 18 µg/L. Chlorophyll-a: 14.3 µg/L. Trophic State Index: 51.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 2.05 m | C |
| Phosphorus | 18 µg/L | A |
| Chlorophyll-a (Algae) | 14.3 µg/L | C |
| Trophic State Index (TSI) | 51 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Lac Lewis
Location
County Ranking
Ranked #12 of 14 lakes in D'Autray
Cleaner Lakes Within 30 Miles
Lac Lewis holds Grade B. 5 nearby lakes hold higher grades.
- ALac ThomasD'Autray · 1.6 mi · Higher grade (B → A)
- ALac DelignyD'Autray · 1.9 mi · Higher grade (B → A)
- ALac CrocheD'Autray · 2.4 mi · Higher grade (B → A)
- ALac RougeD'Autray · 3.2 mi · Higher grade (B → A)
- ALac LongD'Autray · 3.3 mi · Higher grade (B → A)
Nearby Lakes in D'Autray
Explore Lac Lewis across LakeGrade
More Québec Lake Rankings
Other Grade B Lakes in Québec
Eutrophic Lakes in Québec
More records, surveys & data sources
Where this data comes from
Measurements for Lac Lewis 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: