Manicouagan County Lake Quality
Québec, 17 lakes, average grade B (Good)
There are 17 graded lakes in Manicouagan County. The mix is varied enough that the county-level average tells you the broad strokes, not the choose-this-cabin specifics. With an average grade of B, Manicouagan 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 Blanc (A) is the cleanest in the county.
Quick Answers for Manicouagan County
Planning a trip? Check special fishing regulations for Lac Blanc — or check the official Québec fishing regulations.
All Lakes in Manicouagan County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Lac Blanc | A | 18.4 ft | 1.9 µg/L |
| 2 | Lac Migneault | A | 10.5 ft | 4.9 µg/L |
| 3 | Lac Rond | A | 13.8 ft | 2.8 µg/L |
| 4 | Lac Frigon | A | 10.5 ft | 3.5 µg/L |
| 5 | Lac à la Loutre | A | 10.2 ft | 7.5 µg/L |
| 6 | Lac Donlon | B | 6.9 ft | 6.2 µg/L |
| 7 | Lac ThéRèSe | B | 8.2 ft | 5.1 µg/L |
| 8 | Lac Saint-Joseph | B | 9.5 ft | 7.5 µg/L |
| 9 | Lac Taillardat | B | 9.2 ft | 7.1 µg/L |
| 10 | Lac Couillard | B | 6.7 ft | 7.1 µg/L |
| 11 | Lac Petit Bras | B | 7.2 ft | 9 µg/L |
| 12 | Lac la Chesnaye | B | 7.1 ft | 7.4 µg/L |
| 13 | Lac Pascal | B | 9 ft | 5 µg/L |
| 14 | Lac Denise | B | 6.6 ft | 6.9 µg/L |
| 15 | Lac Fer à Cheval | B | 6.6 ft | 9.1 µg/L |
| 16 | Lac Potvin | B | 4.1 ft | 5.4 µg/L |
| 17 | Lac Cinq Cents | B | 4.4 ft | 18.8 µg/L |
Other Counties in Québec
See how Manicouagan County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 38 states.
Where to stay near Manicouagan County
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Source: EPA National Aquatic Resource Surveys, 2026.