D'Autray County, Québec · Water Quality Report Card
Lac Mandeville
Lac Mandeville in D'Autray, Québec received a water quality grade of D (Poor). Water clarity: 1.2 m visibility. Phosphorus: 28.7 µg/L. Chlorophyll-a (algae): 34 µg/L.
- Clarity
- 1.2 m
- Type
- Eutrophic
Lac Mandeville is a productive, nutrient-rich eutrophic lake in D'Autray County, Québec. Water quality is graded D based on 3 sampling years through 2025. Compared to the 13 other monitored lakes in D'Autray County, Lac Mandeville ranks #14 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: 28.7 µg/L. Chlorophyll-a: 34 µg/L. Trophic State Index: 58.
| Metric | Value | Grade |
|---|---|---|
| Water Clarity (Secchi Depth) | 1.2 m | D |
| Phosphorus | 28.7 µg/L | B |
| Chlorophyll-a (Algae) | 34 µg/L | F |
| Trophic State Index (TSI) | 58 | Eutrophic |
High nutrients, frequent algae, reduced clarity
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Fishing Lac Mandeville
Location
County Ranking
Ranked #14 of 14 lakes in D'Autray
Cleaner Lakes Within 30 Miles
Lac Mandeville holds Grade D. 5 nearby lakes hold higher grades.
- ALac CreuxD'Autray · 2.4 mi · Two grade letters higher (D → A)
- ALac ThomasD'Autray · 4 mi · Two grade letters higher (D → A)
- ALac DelignyD'Autray · 1.7 mi · Two grade letters higher (D → A)
- ALac à L'ÎleD'Autray · 2.2 mi · Two grade letters higher (D → A)
- ALac LongD'Autray · 3.9 mi · Two grade letters higher (D → A)
Nearby Lakes in D'Autray
Explore Lac Mandeville 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 Mandeville 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: