Benton County, Missouri
The most common soil here is Bardley, on about 20% of the land: a gravelly silt loam, smooth, like flour. Goss and Poynor come next.
About 67% of the land drains well, and 13% stays wet for long stretches; groundwater comes within two feet of the surface under 13% of it.
USDA rates 81% of the land very limited for a standard septic drain field, and 77% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 6% of the land floods occasionally or more, and bedrock lies within 40 inches under 30% 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 Benton 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 Well drained and the dominant hydrologic group is D (very slow infiltration, high runoff). 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 Benton 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 |
|---|---|---|---|---|---|
| Bardley very gravelly silt loam, 8 to 35 percent slopes, stony | 71K | Well drained | D | Very limited | Very limited |
| Goss very gravelly silt loam, 15 to 35 percent slopes, very stony | 63K | Well drained | C | Very limited | Very limited |
| Water | 32K | Subaqueous | Not rated | Not rated | |
| Poynor very gravelly silt loam, 1 to 8 percent slopes | 30K | Well drained | B | Not limited | Somewhat limited |
| Bardley gravelly silt loam, 3 to 8 percent slopes | 29K | Well drained | D | Very limited | Very limited |
| Gasconade-Rock outcrop complex, 8 to 50 percent slopes | 24K | Somewhat excessively drained | D | Very limited | Very limited |
| Eldon gravelly silt loam, 3 to 8 percent slopes | 19K | Well drained | C | Very limited | Very limited |
| Barden silt loam, 1 to 5 percent slopes | 17K | Moderately well drained | D | Very limited | Very limited |
| Hartwell silt loam, 0 to 1 percent slopes | 16K | Somewhat poorly drained | C/D | Very limited | Very limited |
| McGirk silt loam, 1 to 3 percent slopes | 16K | Poorly drained | C/D | Very limited | Very limited |
| Pomme silt loam, 3 to 8 percent slopes | 15K | Well drained | B | Not limited | Somewhat limited |
| Poynor extremely gravelly silt loam, 8 to 15 percent slopes | 15K | Well drained | B | Somewhat limited | Somewhat limited |
| Union silt loam, 1 to 3 percent slopes | 14K | Moderately well drained | D | Very limited | Very limited |
| Barden silt loam, 1 to 5 percent slopes, eroded | 12K | Moderately well drained | D | Very limited | Very limited |
| Sacville silty clay loam, 1 to 3 percent slopes | 9K | Poorly drained | C/D | Very limited | Very limited |
| Eldon gravelly silt loam, 8 to 15 percent slopes | 9K | Well drained | C | Somewhat limited | Very limited |
| Hartwell silt loam, 1 to 3 percent slopes, eroded | 9K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Racket silt loam, 1 to 3 percent slopes, occasionally flooded | 8K | Well drained | B | Very limited | Very limited |
| Racket silt loam, 0 to 2 percent slopes, occasionally flooded | 8K | Well drained | B | Very limited | Very limited |
| Gasconade-Rock outcrop complex, 3 to 8 percent slopes | 6K | Somewhat excessively drained | D | Very limited | Very 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 77% of soils are rated "very limited" for dwellings with basements. Specific challenges include steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 81% 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.