Iron County, Missouri
The most common soil here is Clarksville, on about 13% of the land: a gravelly silt loam, smooth, like flour. Wilderness and Goss come next.
About 62% of the land drains well; groundwater comes within two feet of the surface under 21% of it.
USDA rates 97% of the land very limited for a standard septic drain field, and 94% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 9% of the land floods occasionally or more, and bedrock lies within 40 inches under 16% of it.
Soils change over short distances, so look up an address below for the soil at that exact spot and the reasons behind each rating.
The soils you're most likely standing on
The biggest named soils in Iron County, Missouri, each drawn five feet deep from its official USDA description, in its recorded colors.
Dots mark gravel; white flecks mark lime. Shares are by acres across the survey area, and each mapped patch usually mixes several of these soils.
The biggest mapped areas
The dominant drainage class is Moderately well drained and the dominant hydrologic group is B (moderate infiltration). The most common soil order is Alfisols — moderately leached forest soils with a clay-enriched subsoil. 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 Iron County, Missouri. Search your address to find the exact soil composition, drainage, and series details at your specific location.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Clarksville-Scholten complex, 15 to 45 percent slopes, very stony | 86K | Somewhat excessively drained | B | Very limited | Very limited |
| Goss very cobbly silt loam, 15 to 50 percent slopes, extremely stony | 38K | Well drained | D | Very limited | Very limited |
| Wilderness gravelly silt loam, 8 to 15 percent slopes | 30K | Moderately well drained | C/D | Very limited | Very limited |
| Irondale gravelly silt loam, 15 to 35 percent slopes, rocky, extremely bouldery | 29K | Well drained | C | Very limited | Very limited |
| Killarney-Frenchmill complex, 15 to 45 percent slopes, rubbly | 26K | Moderately well drained | C | Very limited | Very limited |
| Viburnum silt loam, 3 to 8 percent slopes | 15K | Moderately well drained | C/D | Very limited | Very limited |
| Midco gravelly loam, 1 to 3 percent slopes, frequently flooded | 12K | Somewhat excessively drained | A | Very limited | Very limited |
| Wilderness very gravelly silt loam, 15 to 35 percent slopes | 12K | Moderately well drained | C/D | Very limited | Very limited |
| Captina silt loam, 3 to 8 percent slopes | 8K | Moderately well drained | C/D | Very limited | Very limited |
| Courtois silt loam, 3 to 8 percent slopes | 7K | Well drained | C | Somewhat limited | Very limited |
| Midco gravelly loam, 0 to 3 percent slopes, frequently flooded | 7K | Somewhat excessively drained | A | Very limited | Very limited |
| Knobtop silt loam, 3 to 15 percent slopes, very stony | 6K | Moderately well drained | C | Very limited | Very limited |
| Delassus silt loam, 3 to 8 percent slopes | 5K | Moderately well drained | C | Very limited | Very limited |
| Courtois silt loam, 8 to 15 percent slopes | 5K | Well drained | C | Somewhat limited | Very limited |
| Fourche silt loam, 3 to 8 percent slopes | 5K | Moderately well drained | C | Very limited | Very limited |
| Taumsauk-Irondale-Rock outcrop complex, 15 to 45 percent slopes, extremely stony | 4K | Somewhat excessively drained | D | Very limited | Very limited |
| Gatewood silt loam, 3 to 8 percent slopes | 4K | Moderately well drained | D | Very limited | Very limited |
| Fourche silt loam, 1 to 3 percent slopes | 4K | Moderately well drained | C | Very limited | Very limited |
| Viraton silt loam, 3 to 8 percent slopes | 4K | Moderately well drained | D | Very limited | Very limited |
| Secesh silt loam, 0 to 2 percent slopes, rarely flooded | 3K | Well drained | B | Very limited | Somewhat limited |
Soil Orders in This Area
The USDA classifies every soil into one of 12 soil orders. Here are the dominant orders found in this survey area.
What This Means
Building & Foundations
About 94% of soils are rated "very limited" for dwellings with basements. Specific challenges include steep slopes, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 97% 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.