Cleanest Lakes in Cook County, Minnesota
Round Lake in Cook County leads the rankings with a water quality grade of A and 16.5 ft of clarity. Below are the top 50 cleanest monitored lakes in Cook County, Minnesota, ranked by EPA water quality score.
Ranked List
| # | Lake | County | Grade | Clarity | Phosphorus | Algae |
|---|---|---|---|---|---|---|
| 1 | Round Lake | Cook | A | 16.5 ft | 8.5 µg/L | - |
| 2 | Birch Lake | Cook | A | 18 ft | 8 µg/L | - |
| 3 | Gull Lake | Cook | A | 15.5 ft | 8.5 µg/L | - |
| 4 | Clearwater Lake | Cook | A | 29 ft | 4 µg/L | - |
| 5 | Pike Lake | Cook | A | 17.4 ft | 7 µg/L | - |
| 6 | Trout Lake | Cook | A | 18.4 ft | 9 µg/L | - |
| 7 | Hungry Jack Lake | Cook | A | 18 ft | 7 µg/L | - |
| 8 | Mayhew Lake | Cook | A | 20.6 ft | 5 µg/L | - |
| 9 | Loon Lake | Cook | A | 17.4 ft | 5 µg/L | - |
| 10 | Gunflint Lake | Cook | A | 16.5 ft | 5.5 µg/L | - |
| 11 | Flour Lake | Cook | A | 18.2 ft | 7 µg/L | - |
| 12 | Bearskin Lake | Cook | A | 21 ft | 6 µg/L | - |
| 13 | Mcfarland Lake | Cook | A | 17 ft | 8 µg/L | - |
| 14 | Greenwood Lake | Cook | A | 15.1 ft | 9 µg/L | - |
| 15 | Little Gunflint Lake | Cook | A | 16.2 ft | 7 µg/L | - |
| 16 | Superior Lake | Cook | A | 15.1 ft | 4 µg/L | - |
| 17 | Taylor Lake Deep | Cook | A | 10.6 ft | 13 µg/L | 3.5 µg/L |
| 18 | Trout Lake Deep | Cook | A | 10.7 ft | 9.7 µg/L | 4.4 µg/L |
| 19 | Poplar Lake | Cook | A | 10.2 ft | 9 µg/L | - |
| 20 | Sea Gull Lake | Cook | A | 14.3 ft | 7 µg/L | - |
| 21 | Saganaga Lake | Cook | A | 13 ft | 7 µg/L | - |
| 22 | Alder Lake | Cook | A | 13.8 ft | 8 µg/L | - |
| 23 | Gogebic Lake | Cook | A | 13.8 ft | 5 µg/L | - |
| 24 | West Twin Lake | Cook | B | 9.8 ft | 9 µg/L | - |
| 25 | Portage Lake | Cook | B | 8.5 ft | 9.5 µg/L | - |
| 26 | Caribou Lake | Cook | B | 6.9 ft | 15 µg/L | - |
| 27 | Deer Yard Lake | Cook | B | 7.2 ft | 15 µg/L | - |
| 28 | Devil Track Lake | Cook | B | 7 ft | 12 µg/L | - |
| 29 | Tom Lake | Cook | B | 9 ft | 8 µg/L | - |
| 30 | Tait Lake | Cook | B | 7 ft | 13 µg/L | - |
| 31 | Two Island Lake | Cook | B | 9 ft | 12 µg/L | - |
| 32 | Ball Club Lake | Cook | B | 9.1 ft | 16.5 µg/L | - |
| 33 | Clara Lake | Cook | B | 7.6 ft | 15 µg/L | - |
| 34 | Dick Lake | Cook | B | 7.7 ft | 10 µg/L | - |
| 35 | Chevans Lake Deep | Cook | B | 1.9 ft | 17.5 µg/L | 4.6 µg/L |
| 36 | Little Lake Deep | Cook | B | -324.8 ft | 14 µg/L | 3.9 µg/L |
| 37 | North Lake Deep | Cook | B | -324.8 ft | 7.7 µg/L | 2.9 µg/L |
| 38 | Rice Lake | Cook | B | 5.7 ft | 17 µg/L | - |
| 39 | East Twin Lake | Cook | B | 6.2 ft | 17 µg/L | - |
| 40 | Elbow Lake | Cook | B | 3.7 ft | 19 µg/L | - |
| 41 | Ward Lake | Cook | B | 5.6 ft | 16.5 µg/L | - |
| 42 | Missouri Lake | Cook | B | 4.1 ft | 11 µg/L | - |
| 43 | Ella Lake | Cook | B | 6 ft | 4 µg/L | - |
| 44 | Iron Lake | Cook | B | 4.9 ft | 18 µg/L | - |
| 45 | Little Iron Lake | Cook | B | 4.2 ft | 17.5 µg/L | - |
| 46 | Turtle Lake Deep | Cook | C | -324.8 ft | 22 µg/L | 2 µg/L |
| 47 | Teal Lake Deep | Cook | C | 3.3 ft | 15.5 µg/L | 5.7 µg/L |
| 48 | Loon Lake Deep | Cook | C | -324.8 ft | 23 µg/L | 7.6 µg/L |
| 49 | Dyers Lake | Cook | C | 6.3 ft | 21.5 µg/L | - |
| 50 | Swamp Lake Deep | Cook | C | 1.7 ft | 27 µg/L | 9.2 µg/L |