| Percent Samples with Turbidity more than 25 NTU | |||||||
| Watershed | Mar-Apr | May-Jun | Jul-Aug | Sep-Oct | Winter | All Seasons | |
| Bois De Sioux | 32 | 33 | 68 | 37 | 4 | 34 | |
| Mustinka | 0 | 0 | 0 | 0 | 7 | 5 | |
| Otter Tail | 11 | 32 | 42 | 6 | 0 | 17 | |
| Upper Red | 32 | 50 | 60 | 27 | 4 | 35 | |
| Western Wild Rice | na | na | na | na | na | na | |
| Buffalo | 18 | 24 | 53 | 8 | 0 | 20 | |
| Elm-Marsh | 65 | 94 | 95 | 49 | 3 | 54 | |
| Eastern Wild Rice | 55 | 52 | 33 | 15 | 0 | 31 | |
| Goose | 7 | 13 | 0 | 0 | 0 | 5 | |
| Devils Lake | 0 | 22 | 46 | 0 | 36 | ||
| Upper Sheyenne | na | na | na | na | na | na | |
| Middle Sheyenne | 8 | 0 | 0 | 0 | 0 | 3 | |
| Lower Sheyenne | 31 | 42 | 29 | 17 | 0 | 22 | |
| Maple | na | na | na | na | na | na | |
| Sandhill-Wilson | 67 | 68 | 38 | 50 | 6 | 41 | |
| Red Lakes | 0 | 7 | 0 | 0 | 4 | ||
| Red Lake | 32 | 28 | 44 | 14 | 2 | 21 | |
| Thief | na | na | na | na | na | na | |
| Clearwater | 0 | na | 0 | 0 | 0 | 0 | |
| Grand Marais - Red | 56 | 90 | 100 | 67 | 6 | 55 | |
| Turtle | 0 | 0 | 25 | 0 | 0 | 4 | |
| Forest | na | na | na | na | na | na | |
| Snake | 27 | 50 | 42 | 27 | 15 | 32 | |
| Park | 43 | 67 | 75 | 25 | 50 | ||
| Lower Red | 52 | 91 | 94 | 70 | 3 | 54 | |
| Two Rivers | 27 | 8 | 8 | 10 | 0 | 10 | |
| Pembina | 87 | 45 | 23 | 15 | 24 | 45 | |
| Reseau | 0 | 0 | 5 | 0 | 0 | 1 | |