La Haute-Yamaska County Lake Quality
Québec, 4 lakes, average grade C (Fair)
La Haute-Yamaska County has 4 graded lakes — a thin enough sample that one or two stressed lakes can move the county average noticeably. Use the per-lake pages below for what actually matters. La Haute-Yamaska County averages to a C. The distribution behind that average matters more than the letter: a few stressed lakes versus many decent ones can produce the same average as the inverse.
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 RéServoir ChoinièRe (C); the most-stressed is Lac Roxton (D).
Quick Answers for La Haute-Yamaska County
Planning a trip? Check special fishing regulations for RéServoir ChoinièRe — or check the official Québec fishing regulations.
All Lakes in La Haute-Yamaska County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | RéServoir ChoinièRe | C | 5.6 ft | 19.3 µg/L |
| 2 | Lac Boivin | C | 7.5 ft | 48.4 µg/L |
| 3 | Lac Waterloo | D | 4.3 ft | 33 µg/L |
| 4 | Lac Roxton | D | 3.8 ft | 56.7 µg/L |
Other Counties in Québec
See how La Haute-Yamaska 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.