Logan County, Illinois
The dominant drainage class is Poorly drained and the dominant hydrologic group is B/D (varies with drainage). This report summarizes the major soil map units across the survey area to help you understand what to expect when buying, building, or gardening in Logan County, Illinois.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Sable silty clay loam, 0 to 2 percent slopes | 79K | Poorly drained | B/D | Very limited | Very limited |
| Ipava silt loam, 0 to 2 percent slopes | 78K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Osco silt loam, 2 to 5 percent slopes | 17K | Well drained | B | Somewhat limited | Somewhat limited |
| Sawmill silty clay loam, 0 to 2 percent slopes, frequently flooded | 15K | Poorly drained | B/D | Very limited | Very limited |
| Plano silt loam, 0 to 2 percent slopes | 10K | Well drained | B | Somewhat limited | Very limited |
| Tama silt loam, very deep to sand, 2 to 5 percent slopes | 9K | Well drained | B | Somewhat limited | Very limited |
| Hartsburg silty clay loam, 0 to 2 percent slopes | 9K | Poorly drained | B/D | Very limited | Very limited |
| Buckhart silt loam, 0 to 2 percent slopes | 9K | Moderately well drained | C | Somewhat limited | Very limited |
| Buckhart silt loam, 2 to 5 percent slopes | 8K | Moderately well drained | C | Somewhat limited | Very limited |
| Knight silt loam, 0 to 2 percent slopes | 6K | Poorly drained | C/D | Very limited | Very limited |
| Plano silt loam, sandy substratum, 2 to 5 percent slopes | 6K | Well drained | B | Somewhat limited | Very limited |
| Tama silt loam, 2 to 5 percent slopes | 6K | Well drained | B | Somewhat limited | Somewhat limited |
| Rozetta silt loam, 2 to 5 percent slopes | 6K | Well drained | B | Somewhat limited | Somewhat limited |
| Broadwell silt loam, 2 to 5 percent slopes | 6K | Well drained | B | Somewhat limited | Very limited |
| Tama silt loam, very deep to sand, 0 to 2 percent slopes | 5K | Well drained | B | Somewhat limited | Very limited |
| Elburn silt loam, 0 to 2 percent slopes | 5K | Somewhat poorly drained | B/D | Very limited | Very limited |
| Keomah silt loam, 0 to 2 percent slopes | 5K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Lawson silt loam, cool mesic, 0 to 2 percent slopes, frequently flooded | 5K | Somewhat poorly drained | B/D | Very limited | Very limited |
| Drummer silty clay loam, 0 to 2 percent slopes | 4K | Poorly drained | B/D | Very limited | Very limited |
| Tice silty clay loam, sandy substratum, 0 to 2 percent slopes, frequently flooded | 4K | Somewhat poorly drained | B/D | Very limited | Very limited |
What This Means
Building & Foundations
About 72% of soils are rated "very limited" for dwellings with basements. Specific challenges include poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 90% of soils are rated "very limited" for septic absorption fields. Poorly drained soils can't absorb septic effluent effectively. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Many soils hold water for extended periods. Raised beds are highly recommended to improve drainage for vegetables. Well-adapted native plants and water-loving species will do best in natural conditions.