La Rivière-du-Nord County Lake Quality
Québec, 17 lakes, average grade B (Good)
La Rivière-du-Nord County's 17 graded lakes fall in the moderate-density bracket for Québec. The county-level average smooths over real differences — a single agricultural watershed near the southwest corner can pull the average down even if the rest of the county runs clean. With an average grade of B, La Rivière-du-Nord County sits comfortably above the Québec median.
Most of the county's monitored lakes are shallow — under 50 feet — which means wind keeps the water column mixed all summer and sediment-bound phosphorus releases back into the surface layer whenever the bottom is disturbed. Lac de L'Achigan (A) is the cleanest in the county.
Quick Answers for La Rivière-du-Nord County
Planning a trip? Check special fishing regulations for Lac de L'Achigan — or check the official Québec fishing regulations.
All Lakes in La Rivière-du-Nord County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac de L'Achigan | A | 16.4 ft | 3.9 µg/L |
| 2 | Lac Morency | A | 18 ft | 4.8 µg/L |
| 3 | Lac Cornu | A | 19.4 ft | 4.8 µg/L |
| 4 | Lac Tracy | A | 23 ft | 3.9 µg/L |
| 5 | Lac Montaubois | A | 24 ft | 3.9 µg/L |
| 6 | Lac En Coeur | A | 12.8 ft | 6.8 µg/L |
| 7 | Lac Bleu | A | 13.1 ft | 6.3 µg/L |
| 8 | Lac René | A | 11.8 ft | 7.1 µg/L |
| 9 | Lac Connelly | A | 12.5 ft | 5 µg/L |
| 10 | Lac Maillé | B | 9.5 ft | 10.1 µg/L |
| 11 | Lac des Sources | B | 7.9 ft | 9.7 µg/L |
| 12 | Lac Renaud | B | 8.4 ft | 10.5 µg/L |
| 13 | Lac ÉCho | B | 9.8 ft | 11.9 µg/L |
| 14 | Lac L'Heureux | B | 5.9 ft | 15.5 µg/L |
| 15 | Lac du Pin Rouge | B | 6.6 ft | 9.9 µg/L |
| 16 | Lac Saint-FrançOis | B | 5.2 ft | 19 µg/L |
| 17 | Lac Beaver | C | 3.6 ft | 21.3 µg/L |
Other Counties in Québec
See how La Rivière-du-Nord 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.