| Watershed : Thief River | |||
| Watershed Characteristics | Area (ac)* | Percentage | |
| Agroecoregions | Very Poorly Drained Lake Sediments | 376,904 | 56.1 |
| Peatlands | 144,531 | 21.5 | |
| Red Lakes Loams | 130,842 | 19.5 | |
| Inter-Beach Sand Bars | 19,696 | 2.9 | |
| Somewhat Poorly Drained Lake Sediments | 158 | 0.0 | |
| Counties | Marshall | 381,710 | 56.8 |
| Beltrami | 237,495 | 35.3 | |
| Pennigton | 52,452 | 7.8 | |
| Lake of the Woods | 341 | 0.1 | |
| Roseau | 133 | 0.0 | |
| Slope Steepness | 0-2 % | 648,437 | 96.5 |
| 2-6 % | 9,990 | 1.5 | |
| Water | 13,704 | 2.0 | |
| Drainage | Poor Improved by Tiling | 395,585 | 58.9 |
| Poorly Drained | 252,796 | 37.6 | |
| Well Drained | 9,081 | 1.4 | |
| Water | 13,704 | 2.0 | |
| No Rating | 966 | 0.1 | |
| Proximity | Land Locked | 434,627 | 64.7 |
| Drainage Ditches | 179,298 | 26.7 | |
| Lake Shoreline | 21,466 | 3.2 | |
| Permanent River | 14,142 | 2.1 | |
| Intermittent River | 7,225 | 1.1 | |
| Island Shoreline | 1,670 | 0.2 | |
| Water | 13,704 | 2.0 | |
| Geomorphology | Agassiz Lacustrine Plain, Red River Valley | 376,904 | 56.1 |
| Agassiz Peatlands | 144,531 | 21.5 | |
| Agassiz Lacustrine Plain, Red Lake Area | 130,842 | 19.5 | |
| Agassiz Lacustrine Plain, Inter-Beach Area | 19,696 | 2.9 | |
| Agassiz Lacustrine Plain, Beltrami Island Area | 158 | 0.0 | |
| Water Erosion | Slight | 235,321 | 35.0 |
| Moderate | 428,511 | 63.8 | |
| High | 8,300 | 1.2 | |
| Wind Erosion Group | Very Severe | 260,666 | 38.8 |
| Severe | 208,409 | 31.0 | |
| High | 188,093 | 28.0 | |
| No Data | 14,964 | 2.2 | |
| Precipitation | Between 20-22 inches | 524,942 | 78.1 |
| Between 22-24 inches | 147,190 | 21.9 | |
| Growing Degree Days | 1500-1750 Degree Days | 451,852 | 67.2 |
| 1750-2000 Degree Days | 220,280 | 32.8 | |
| * Expressed as acres or percent for major watershed area in the Red River of the North basin | |||