Cleanest Lakes in Lake County, Montana
Nla Lake in Lake County leads the rankings with a water quality grade of A and 32.3 ft of clarity. Below are the top 14 cleanest monitored lakes in Lake County, Montana, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Nla Lake | Lake | A | 32.3 ft | 7.8 µg/L | 0.9 µg/L |
| 2 | Lake Mary Ronan East Location | Lake | A | 15.1 ft | 9 µg/L | 4.3 µg/L |
| 3 | Swan Lake South End | Lake | A | - | 3.7 µg/L | 1.3 µg/L |
| 4 | Loon Lake | Lake | A | - | 6.7 µg/L | 2.2 µg/L |
| 5 | Swan Lake North End | Lake | A | - | 3.6 µg/L | 1.2 µg/L |
| 6 | Jette Lake | Lake | A | - | 16.6 µg/L | 4.7 µg/L |
| 7 | Mary Ronan Lake East | Lake | A | - | 15.8 µg/L | 4.1 µg/L |
| 8 | Flathead Lake | Lake | A | - | 3.6 µg/L | 0.8 µg/L |
| 9 | Flathead Lake | Lake | A | - | 2.6 µg/L | 0.6 µg/L |
| 10 | Flathead Lake | Lake | A | - | 3 µg/L | 1 µg/L |
| 11 | Flathead Lake | Lake | A | - | 2.4 µg/L | 0.9 µg/L |
| 12 | Flathead Lake | Lake | A | - | 2.4 µg/L | 0.9 µg/L |
| 13 | Lake Mary Ronan West Location | Lake | A | 14.7 ft | 13.5 µg/L | 2.4 µg/L |
| 14 | Mary Ronan Lake West | Lake | B | - | 33.6 µg/L | 7.1 µg/L |