| County : Mahnomen | |||
| County Characteristics | Area (ac)* | Percentage | |
| Major Watersheds | Wild Rice River | 339,683 | 91.0 |
| Sandhill River | 21,812 | 5.8 | |
| Clearwater River | 11,710 | 3.1 | |
| Otter Tail River | 87 | 0.0 | |
| Agroecoregions | Steep Dryer Moraine | 171,809 | 46.0 |
| Steeper Till | 29,299 | 7.9 | |
| Dryer Till | 63,527 | 17.0 | |
| Mahnomen Lake Sediments | 108,657 | 29.1 | |
| Slope Steepness | 0-2 % | 19,602 | 5.3 |
| 2-6 % | 181,542 | 48.6 | |
| 2-12 % | 1,371 | 0.4 | |
| 6-12 % | 643 | 0.2 | |
| 6-45 % | 141,018 | 37.8 | |
| 12-45 % | 26,712 | 7.2 | |
| Water | 2,404 | 0.6 | |
| Drainage | Well Drained | 258,919 | 69.4 |
| Poor improved by tiling | 76,749 | 20.6 | |
| Poorly Drained | 26,467 | 7.1 | |
| No rating | 8,752 | 2.3 | |
| Water | 2,404 | 0.6 | |
| Proximity | Island Shoreline | 195 | 0.1 |
| Lake Shoreline | 50,379 | 13.5 | |
| Permanent River | 23,534 | 6.3 | |
| Intermittent River | 60,984 | 16.3 | |
| Drainage Ditches | 16,160 | 4.3 | |
| Water | 2,404 | 0.6 | |
| Land Locked | 219,635 | 58.8 | |
| Geomorphology | Alexandria Moraine Complex | 147,146 | 39.4 |
| Mahnomen Lacustrine Plain | 108,657 | 29.1 | |
| Fosston Till Plain, Loamy | 40,991 | 11.0 | |
| Itasca Moraine Complex, Rolling | 28,520 | 7.6 | |
| Bagley Outwash Plain, Sandy to Gravelly | 24,663 | 6.6 | |
| Fergus Falls (Young Gray Drift) Till Plain | 22,536 | 6.0 | |
| Falk Till Plain, Loamy | 778 | 0.2 | |
| Water Erosion | Slight | 2,100 | 0.6 |
| Moderate | 115,453 | 30.9 | |
| High | 31,965 | 8.6 | |
| Severe | 223,114 | 59.8 | |
| Extreme | 660 | 0.2 | |
| Wind Erosion Group | Very Severe | 24,606 | 6.6 |
| Severe | 194,119 | 52.0 | |
| High | 28,382 | 7.6 | |
| Moderate | 121,044 | 32.4 | |
| Slight | 3,081 | 0.8 | |
| No Data | 2,058 | 0.6 | |
| Precipitation | Between 22-24 inches | 308,692 | 82.7 |
| Between 24-26 inches | 64,599 | 17.3 | |
| Growing Degree Days | 2000-2250 Degree Days | 69 | 0.0 |
| 2250-2500 Degree Days | 132,787 | 35.6 | |
| 2500-2750 Degree Days | 240,436 | 64.4 | |
| * Expressed as acres or percent for the County area | |||