D'Autray County Lake Quality
Québec, 14 lakes, average grade B (Good)
Only 14 lakes in D'Autray County carry an active grade. The county-level summary is therefore representative of those specific lakes, not necessarily of every water body in the county. With an average grade of B, D'Autray County sits comfortably above the Québec median.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Lac Thomas (A); the most-stressed is Lac Mandeville (D).
Quick Answers for D'Autray County
Planning a trip? Check special fishing regulations for Lac Thomas — or check the official Québec fishing regulations.
All Lakes in D'Autray County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Thomas | A | 16.7 ft | 3.8 µg/L |
| 2 | Lac Creux | A | 30.8 ft | 3.3 µg/L |
| 3 | Lac Deligny | A | 12.8 ft | 7.3 µg/L |
| 4 | Lac Long | A | 11.6 ft | 5 µg/L |
| 5 | Lac Rouge | A | 14.1 ft | 4.6 µg/L |
| 6 | Lac à L'Île | A | 14.4 ft | 6.7 µg/L |
| 7 | Lac Croche | A | 10.2 ft | 8.1 µg/L |
| 8 | Lac HéNault | B | 7.1 ft | 7.5 µg/L |
| 9 | Lac Mcgrey | B | 9.8 ft | 6.5 µg/L |
| 10 | Lac Maskinongé | B | 8.9 ft | 9.5 µg/L |
| 11 | Lac Sainte-Rose | B | 5.7 ft | 14.2 µg/L |
| 12 | Lac Lewis | B | 6.7 ft | 18 µg/L |
| 13 | Lac Hamelin | C | 3 ft | 21.3 µg/L |
| 14 | Lac Mandeville | D | 3.9 ft | 28.7 µg/L |
Other Counties in Québec
See how D'Autray County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 38 states.
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Source: EPA National Aquatic Resource Surveys, 2026.