Madison County, Missouri
The dominant drainage class is Well drained and the dominant hydrologic group is B (moderate infiltration). 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 Madison County, Missouri.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Clarksville-Scholten complex, 15 to 45 percent slopes, very stony | 76K | Somewhat excessively drained | B | Very limited | Very limited |
| Poynor-Clarksville-Scholten complex, 8 to 15 percent slopes, stony | 29K | Well drained | B | Somewhat limited | Somewhat limited |
| Irondale gravelly silt loam, 15 to 35 percent slopes, rocky, extremely bouldery | 21K | Well drained | C | Very limited | Very limited |
| Killarney-Frenchmill complex, 15 to 45 percent slopes, rubbly | 17K | Moderately well drained | C | Very limited | Very limited |
| Tilk very gravelly coarse sandy loam, 1 to 3 percent slopes, rarely flooded | 12K | Well drained | B | Very limited | Very limited |
| Delassus silt loam, 3 to 8 percent slopes | 12K | Moderately well drained | C | Very limited | Very limited |
| Marquand silt loam, 3 to 8 percent slopes | 9K | Moderately well drained | C | Very limited | Very limited |
| Trackler-Irondale complex, 8 to 15 percent slopes | 9K | Moderately well drained | C | Very limited | Very limited |
| Tilk very gravelly coarse sandy loam, 0 to 3 percent slopes, rarely flooded | 8K | Well drained | B | Very limited | Very limited |
| Firebaugh silt, 3 to 8 percent slopes | 8K | Moderately well drained | D | Very limited | Very limited |
| Aslinger-Waben complex, 3 to 15 percent slopes | 7K | Moderately well drained | C/D | Very limited | Very limited |
| Crider silt loam, 3 to 8 percent slopes, moderately eroded | 7K | Well drained | B | Somewhat limited | Somewhat limited |
| Trackler silt loam, 3 to 8 percent slopes | 7K | Moderately well drained | C/D | Very limited | Very limited |
| Relfe sandy loam, 0 to 3 percent slopes, occasionally flooded | 5K | Excessively drained | A | Very limited | Very limited |
| Cornwall silt loam, 3 to 8 percent slopes | 5K | Moderately well drained | C | Very limited | Very limited |
| Lily-Ramsey complex, 3 to 8 percent slopes | 4K | Well drained | C | Very limited | Very limited |
| Captina silt loam, 3 to 8 percent slopes | 4K | Moderately well drained | C/D | Very limited | Very limited |
| Roselle silt loam, 3 to 8 percent slopes | 4K | Moderately well drained | C | Very limited | Very limited |
| Alred-Rueter complex, 15 to 35 percent slopes, very stony | 4K | Well drained | C | Very limited | Very limited |
| Secesh silt loam, 0 to 2 percent slopes, rarely flooded | 4K | Well drained | B | Very limited | Somewhat limited |
What This Means
Building & Foundations
About 85% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 83% of soils are rated "very limited" for septic absorption fields. Despite good drainage overall, limitations may stem from shallow bedrock, steep slopes, or seasonal conditions. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Well-drained soils on sloped terrain — good for most plants but watch for erosion. Terracing, contour planting, and mulching help retain moisture and topsoil. Drip irrigation is more effective than sprinklers on slopes.