Cleanest Lakes in Isanti County, Minnesota
Lower Birch Lake in Isanti County leads the rankings with a water quality grade of A and 10.8 ft of clarity. Below are the top 17 cleanest monitored lakes in Isanti County, Minnesota, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Lower Birch Lake | Isanti | A | 10.8 ft | 15 µg/L | 2.1 µg/L |
| 2 | Spectacle Lake | Isanti | A | 13.8 ft | 11 µg/L | - |
| 3 | Upper Birch Lake | Isanti | A | 10.8 ft | 9.5 µg/L | - |
| 4 | Horseshoe Lake | Isanti | B | 3.6 ft | 12 µg/L | 2.7 µg/L |
| 5 | Hoffman Lake | Isanti | B | 4.1 ft | 15 µg/L | 2.7 µg/L |
| 6 | Horseleg Lake | Isanti | B | 3.7 ft | 17 µg/L | 4 µg/L |
| 7 | Fannie Lake | Isanti | C | 7 ft | 37 µg/L | 8.7 µg/L |
| 8 | Elms Lake | Isanti | C | 6.9 ft | 53 µg/L | 10.7 µg/L |
| 9 | Blue Lake | Isanti | C | 8.9 ft | 47 µg/L | 16 µg/L |
| 10 | Green Lake | Isanti | C | 5.1 ft | 44 µg/L | 11.7 µg/L |
| 11 | Skogman Lake | Isanti | C | 5.4 ft | 31 µg/L | 12.5 µg/L |
| 12 | Lory Lake | Isanti | C | 6 ft | 41 µg/L | 10.7 µg/L |
| 13 | Francis Lake | Isanti | D | 2 ft | 62 µg/L | 17.8 µg/L |
| 14 | Twin Lake | Isanti | D | 2.6 ft | 110 µg/L | 11.7 µg/L |
| 15 | Little Stanchfield Lake | Isanti | D | 3.5 ft | 132 µg/L | 26.7 µg/L |
| 16 | North Stanchfield Lake | Isanti | F | 2.8 ft | 171 µg/L | 50.7 µg/L |
| 17 | South Stanchfield Lake | Isanti | F | 2.5 ft | 119 µg/L | 33.4 µg/L |