Lakes With Algae Problems in Minnesota
35 lakes in Minnesota report elevated algae levels (chlorophyll-a above 20 µg/L). These lakes are most likely to develop blue-green algae blooms during warm, calm summer weather. Avoid swimming during visible blooms and rinse pets after contact.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Augusta Lake | Dakota | F | - | 178 µg/L | 160 µg/L |
| 2 | Hanska Lake | Brown | F | 1 ft | 219 µg/L | 99.6 µg/L |
| 3 | Allie Lake | Renville | F | 2 ft | 232 µg/L | 98.3 µg/L |
| 4 | George Lake | Martin | F | 1.6 ft | 160 µg/L | 93.5 µg/L |
| 5 | Typo Lake | Anoka | F | 1 ft | 198 µg/L | 88.1 µg/L |
| 6 | Hall Lake | Martin | F | 2.6 ft | 96 µg/L | 80.1 µg/L |
| 7 | Budd Lake | Martin | F | 2.6 ft | 86 µg/L | 75.8 µg/L |
| 8 | Clear Lake 1 | Goodhue | F | 0.5 ft | 174 µg/L | 63.8 µg/L |
| 9 | Goose Lake | Goodhue | F | 0.4 ft | 176 µg/L | 60.6 µg/L |
| 10 | Clear Lake | Brown | F | 0.8 ft | 196 µg/L | 55.6 µg/L |
| 11 | Amber Lake | Martin | F | 2 ft | 181 µg/L | 53.4 µg/L |
| 12 | Center Lakedeep | Cook | D | 1.4 ft | 53 µg/L | 52.7 µg/L |
| 13 | North Stanchfield Lake | Isanti | F | 2.8 ft | 171 µg/L | 50.7 µg/L |
| 14 | Sisseton Lake | Martin | F | 2.5 ft | 99 µg/L | 49.1 µg/L |
| 15 | Washington Lake | Le Sueur | F | 4.5 ft | 121 µg/L | 48.1 µg/L |
| 16 | East Arctic Lake | Scott | F | - | 94.5 µg/L | 44.7 µg/L |
| 17 | Preston Lake | Renville | F | 5 ft | 222 µg/L | 44.1 µg/L |
| 18 | Pioneer Lake | Chisago | F | 2 ft | 110 µg/L | 43 µg/L |
| 19 | Sleepy Eye Lake | Brown | D | 3.3 ft | 39.5 µg/L | 41.7 µg/L |
| 20 | Emily Lake | Le Sueur | F | 2 ft | 63 µg/L | 40.1 µg/L |
| 21 | Wellner-Hageman Reservoir | Brown | D | 3.7 ft | 45 µg/L | 38.5 µg/L |
| 22 | Gerhardt Lake | Dakota | D | 2.5 ft | 43 µg/L | 38 µg/L |
| 23 | South Stanchfield Lake | Isanti | F | 2.5 ft | 119 µg/L | 33.4 µg/L |
| 24 | Rush Lake | Chisago | D | 3 ft | 61 µg/L | 29.5 µg/L |
| 25 | Martin Lake | Anoka | D | 2.5 ft | 53.5 µg/L | 28.9 µg/L |
| 26 | Lower Pigeon Lake | Itasca | D | 4.2 ft | 46 µg/L | 27.6 µg/L |
| 27 | Little Stanchfield Lake | Isanti | D | 3.5 ft | 132 µg/L | 26.7 µg/L |
| 28 | Wallmark Lake | Chisago | F | 1.6 ft | 115 µg/L | 26.5 µg/L |
| 29 | North Lake 2 | Goodhue | D | 1.2 ft | 87 µg/L | 26 µg/L |
| 30 | Mitchell Lake | Hennepin | D | 3 ft | 37 µg/L | 23.8 µg/L |
| 31 | Emily Lake | Chisago | F | 1.6 ft | 155 µg/L | 22.5 µg/L |
| 32 | Big Pine Lake | Pine | C | 4.3 ft | 21 µg/L | 21 µg/L |
| 33 | Rabour Lake | Chisago | D | 3 ft | 54 µg/L | 21 µg/L |
| 34 | Linn Lake | Chisago | D | 1.6 ft | 78.5 µg/L | 20.5 µg/L |
| 35 | Little Lake | Chisago | D | 3 ft | 68 µg/L | 20 µg/L |