| County : Martin | |||
| County Characteristics | Area (ac)* | Percentage | |
| Major Watersheds | Blue Earth River | 304,022 | 85.7 |
| Watonwan River | 50,774 | 14.3 | |
| Agroecoregions | Wetter Blue Earth Till | 303,160 | 85.5 |
| Wetter Clays and Silts | 39,776 | 11.2 | |
| Steep Stream Banks | 11,861 | 3.3 | |
| Slope Steepness | 0-2 Percent | 131,163 | 37.0 |
| 2-6 Percent | 222,368 | 62.7 | |
| 2-12 Percent | 455 | 0.1 | |
| Water | 810 | 0.2 | |
| Internal Drainage | Poorly drained | 122,487 | 34.5 |
| Poor/Improved by tiling | 11,058 | 3.1 | |
| Well drained | 220,440 | 62.1 | |
| Water | 810 | 0.2 | |
| Proximity to Water | Landlocked | 267,777 | 75.5 |
| Drainage Ditches | 22,842 | 6.4 | |
| Permanent River | 22,575 | 6.4 | |
| Lake Shoreline | 20,821 | 5.9 | |
| Intermittent River | 19,971 | 5.6 | |
| Water | 810 | 0.2 | |
| Geomorphology | Blue Earth Till Plain (066) | 346,377 | 97.6 |
| Wells-Rush River Ground Moraine (042) | 8,419 | 2.4 | |
| Water Erosion | Moderate | 19,743 | 5.6 |
| High | 61,222 | 17.3 | |
| Severe | 173,731 | 49.0 | |
| Extreme | 100,100 | 28.2 | |
| Wind Erosion Group | Severe | 93,340 | 26.3 |
| Moderate | 261,457 | 73.7 | |
| Crop Productivity | Low productivity | 932 | 0.3 |
| Medium productivity | 12,587 | 3.6 | |
| High productivity | 341,277 | 96.2 | |
| Precipitation | Between 28-30 inches | 148,492 | 41.9 |
| Between 30-32 inches | 206,304 | 58.2 | |
| Growing Degree Days | 2250-2500 Degree Days | 72,786 | 20.5 |
| 2500-2750 Degree Days | 282,010 | 79.5 | |
| * Expressed as acres or percent for County area in the Minnesota River Basin | |||