Cochrane District County Lake Quality
Ontario, 131 lakes, average grade B (Good)
Cochrane District County in Ontario carries 131 graded lakes — one of the lake-richer counties in our dataset. Coverage that dense usually reflects active lake-association sampling alongside state-agency monitoring. The county-wide average lands at B — solid water quality with most lakes carrying clear summer transparency and low-to-moderate phosphorus.
The county's lakes lean shallow, which makes the grades sensitive to wind, sediment-resuspension, and any nutrient inputs from the watershed. The cleanest lake on the books is Bobs Lake (A); the most-stressed is Ouellet Lake (F).
Quick Answers for Cochrane District County
Planning a trip? Check special fishing regulations for Bobs Lake — or check the official Ontario fishing regulations.
All Lakes in Cochrane District County
| Rank | Lake | Grade | Clarity | Phosphorus |
|---|---|---|---|---|
| 1 | Bobs Lake | A | - | 13.7 µg/L |
| 2 | Gibson Lake | A | 17.7 ft | 5.4 µg/L |
| 3 | Little Star Lake | A | - | 7.4 µg/L |
| 4 | Mcdonald Lake | A | 16.4 ft | 9.9 µg/L |
| 5 | Munro Lake | A | 17.9 ft | 6 µg/L |
| 6 | Porcupine Lake | A | - | 13.5 µg/L |
| 7 | Silver Queen Lake | A | 21 ft | 16.1 µg/L |
| 8 | St Therese Lake | A | - | 16.7 µg/L |
| 9 | Butler Lake | A | - | 6.5 µg/L |
| 10 | Cook'S Lake | A | - | 10.1 µg/L |
| 11 | Baker Lake | A | - | 4.4 µg/L |
| 12 | Bonner Lake | A | - | 11.2 µg/L |
| 13 | Carey Lake | A | - | 10.5 µg/L |
| 14 | Charland Lake | A | - | 16 µg/L |
| 15 | Clear Lake | A | - | 5.1 µg/L |
| 16 | Dora Lake | A | - | 18.4 µg/L |
| 17 | Doucette Lake | A | - | 11.8 µg/L |
| 18 | Dundonald Lake | A | - | 15.4 µg/L |
| 19 | East Dundonald Lake | A | - | 16.5 µg/L |
| 20 | Ecko Lake | A | - | 10.3 µg/L |
| 21 | Fushimi Lake | A | - | 18.4 µg/L |
| 22 | Hanlan Lake | A | - | 16.2 µg/L |
| 23 | Horseshoe Lake | A | - | 9.3 µg/L |
| 24 | Loon Lake | A | - | 7.8 µg/L |
| 25 | Mcinnis Lake | A | - | 10.5 µg/L |
| 26 | Meadow Lake | A | - | 8.9 µg/L |
| 27 | Noted Lake | A | - | 18.3 µg/L |
| 28 | Pearl Lake | A | - | 10 µg/L |
| 29 | Pearl Lake | A | - | 13.9 µg/L |
| 30 | Pivabiska Lake | A | - | 19.2 µg/L |
| 31 | Reid Lake | A | - | 7.7 µg/L |
| 32 | Shallow Lake | A | - | 9.7 µg/L |
| 33 | Shannon Lake | A | - | 9.3 µg/L |
| 34 | Star Lake | A | - | 9 µg/L |
| 35 | Three Nations Lake | A | - | 18.3 µg/L |
| 36 | Wade Lake | A | - | 13.2 µg/L |
| 37 | Wildgoose Lake | A | - | 7.1 µg/L |
| 38 | Withington Lake | A | - | 11.6 µg/L |
| 39 | Wolverine Lake | A | - | 15.3 µg/L |
| 40 | Coppell Lake | A | 10.5 ft | 8.3 µg/L |
| 41 | Halfmoon Lake | A | 12.1 ft | 10.3 µg/L |
| 42 | Johnson'S Lake | A | 12.6 ft | 8.1 µg/L |
| 43 | Nellie Lake | A | 12.1 ft | 8 µg/L |
| 44 | Perry Lake | A | 14.8 ft | 9.6 µg/L |
| 45 | Proulx Lake | A | 10.5 ft | 11.6 µg/L |
| 46 | Remi Lake | A | 10.8 ft | 12.5 µg/L |
| 47 | Twin Lake | A | 10.2 ft | 4.7 µg/L |
| 48 | Dana Lake | A | 10.7 ft | 15.7 µg/L |
| 49 | Fortune Lake | A | 13.9 ft | 4.7 µg/L |
| 50 | Barber'S Bay Lake | B | 9.8 ft | 13.4 µg/L |
| 51 | Boom Lake | B | 7.9 ft | 7.7 µg/L |
| 52 | Charette Lake | B | 7.5 ft | 10.3 µg/L |
| 53 | Commando Lake | B | 7.9 ft | 10.4 µg/L |
| 54 | Fredrick House Lake | B | 10 ft | - |
| 55 | Heart Lake | B | 7.9 ft | 7.9 µg/L |
| 56 | Mcintosh Lake | B | 6.9 ft | 14.7 µg/L |
| 57 | Moose Lake | B | - | 29.6 µg/L |
| 58 | Rawcourt Lake | B | 7.4 ft | 11.2 µg/L |
| 59 | Rice Lake | B | 8.9 ft | 13.2 µg/L |
| 60 | Tailleurs Lake | B | 8.5 ft | 12 µg/L |
| 61 | Watersnake Lake | B | 7.2 ft | 10.9 µg/L |
| 62 | Guilfoyle Lake | B | 9.5 ft | 13.8 µg/L |
| 63 | Big Pike Lake | B | 9.8 ft | 7.6 µg/L |
| 64 | Chipman Lake | B | 9.8 ft | 11.2 µg/L |
| 65 | Clarice Lake | B | 7.5 ft | 6.2 µg/L |
| 66 | Edgar Lake | B | 6.9 ft | 9.3 µg/L |
| 67 | Sweetwater Lake | B | 7.4 ft | 8.6 µg/L |
| 68 | Jowsey Lake | B | 6.9 ft | 8.6 µg/L |
| 69 | Little Kesagami Lake | B | 6.9 ft | 7.5 µg/L |
| 70 | Maloney Lake | B | - | 22.8 µg/L |
| 71 | Montreuil Lake | B | - | 26.2 µg/L |
| 72 | Natogami Lake | B | 6.9 ft | 10.2 µg/L |
| 73 | Object Id Lake | B | - | 22.6 µg/L |
| 74 | Pool Lake | B | 8.2 ft | 11.9 µg/L |
| 75 | Poulos Lake | B | 8.2 ft | 8.4 µg/L |
| 76 | Saganash Lake | B | 8.2 ft | 15.5 µg/L |
| 77 | South Bear Lake | B | 7.9 ft | 6.6 µg/L |
| 78 | Trollope Lake | B | 9.8 ft | 6.3 µg/L |
| 79 | Bigwater Lake | B | 6.2 ft | 15.1 µg/L |
| 80 | Carleton Lake | B | 5.9 ft | 12.5 µg/L |
| 81 | D'Amour Lake | B | 3.9 ft | 18.7 µg/L |
| 82 | Dora Lake | B | 3.9 ft | 19.3 µg/L |
| 83 | Guenette Lake | B | 5.9 ft | 14.4 µg/L |
| 84 | Heart Lake | B | 4.9 ft | 10.5 µg/L |
| 85 | Ice Chest Lake | B | 6.4 ft | 10.3 µg/L |
| 86 | Kamiskotia Lake | B | 4.3 ft | 18.9 µg/L |
| 87 | Lac des Isles Lake | B | 5.9 ft | 12.4 µg/L |
| 88 | Lower Deception Lake | B | 4.1 ft | 18.9 µg/L |
| 89 | Meilleurs Lake | B | 5.6 ft | 9.6 µg/L |
| 90 | Mine Lake | B | 5.9 ft | 16.8 µg/L |
| 91 | Opasatika Lake | B | 4.9 ft | 17.5 µg/L |
| 92 | Pike Lake | B | 4.6 ft | 16.7 µg/L |
| 93 | Shackleton Lake | B | 6.6 ft | 11.8 µg/L |
| 94 | Burntbush Lake | B | 4.9 ft | 8.4 µg/L |
| 95 | Chabbie Lake | B | 4.6 ft | 8.5 µg/L |
| 96 | Favell Lake | B | 3.9 ft | 19 µg/L |
| 97 | Harris Lake | B | 4.9 ft | 12.3 µg/L |
| 98 | Hillmer Lake | B | 4.9 ft | 12.1 µg/L |
| 99 | Kattawagami Lake | B | 4.8 ft | 9.6 µg/L |
| 100 | Legault'S Lake | B | 5.6 ft | 15.5 µg/L |
| 101 | Little Abitibi Lake | B | 4.1 ft | 11.5 µg/L |
| 102 | Obj. Id (Grassy Lake | B | 3.9 ft | 18.4 µg/L |
| 103 | Object Id Lake | B | 4.3 ft | 7.7 µg/L |
| 104 | Object Id Lake | B | 3.9 ft | 11.6 µg/L |
| 105 | Parson Lake | B | 4.3 ft | 7.9 µg/L |
| 106 | Patawagamau Lake | B | 5.2 ft | 11.6 µg/L |
| 107 | Pearce Lake | B | 4.9 ft | 11.6 µg/L |
| 108 | Pickerel Lake | B | 5.6 ft | 15.9 µg/L |
| 109 | Pierre Lake | B | 4.9 ft | 12 µg/L |
| 110 | Piyagoskogau Lake | B | 3.6 ft | 11.2 µg/L |
| 111 | Return Lake | B | 6.2 ft | 10.7 µg/L |
| 112 | Sand Lake | B | 5.6 ft | 10.6 µg/L |
| 113 | Snare Lake | B | 4.6 ft | 11.9 µg/L |
| 114 | Stringer Lake | B | 3.6 ft | 9.9 µg/L |
| 115 | Wasicho Lake | B | 6.2 ft | 7.9 µg/L |
| 116 | Departure Lake | C | 3 ft | 15.2 µg/L |
| 117 | Fletchers Lake | C | 3 ft | 18 µg/L |
| 118 | Lillabelle Lake | C | 4.9 ft | 24.8 µg/L |
| 119 | Nighthawk Lake | C | - | 57.8 µg/L |
| 120 | Humestone Lake | C | 3 ft | 19.6 µg/L |
| 121 | Kesagami Lake | C | 2.3 ft | 16.9 µg/L |
| 122 | Oke Lake | C | 3.3 ft | 15.9 µg/L |
| 123 | Allan Lake | C | 2.6 ft | 24.5 µg/L |
| 124 | Zadi Lake | C | 2.8 ft | 22.1 µg/L |
| 125 | Black River Lake | D | 1.6 ft | 38.3 µg/L |
| 126 | Foot Lake | D | 4.9 ft | - |
| 127 | Abitibi Lake | D | 1.3 ft | 43.2 µg/L |
| 128 | Frederick House Lake | D | 2 ft | 45.9 µg/L |
| 129 | Night Hawk Lake | D | 1 ft | 32.9 µg/L |
| 130 | Abitibi Lake | D | 1 ft | 61.8 µg/L |
| 131 | Ouellet Lake | F | 2.6 ft | - |
Other Counties in Ontario
See how Cochrane District County stacks up in the national county water-quality rankings, or browse the full directory of graded lakes across all 38 states.
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Source: EPA National Aquatic Resource Surveys, 2026.