Platte County, Missouri
The most common soil here is Knox, on about 22% of the land: a silt loam, smooth, like flour. Higginsville and Sharpsburg come next.
About 31% of the land drains well, and 23% stays wet for long stretches; groundwater comes within two feet of the surface under 22% of it.
USDA rates 86% of the land very limited for a standard septic drain field, and 79% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 23% of the land floods occasionally or more, and bedrock lies within 40 inches under 9% 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 Platte 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 Mollisols — grassland soils with a thick, dark, fertile topsoil rich in organic matter. 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 Platte 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 |
|---|---|---|---|---|---|
| Higginsville silt loam, 5 to 9 percent slopes, eroded | 34K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Knox silty clay loam, 14 to 20 percent slopes, severely eroded | 23K | Well drained | B | Very limited | Very limited |
| Knox silty clay loam, 9 to 14 percent slopes, severely eroded | 16K | Well drained | B | Somewhat limited | Somewhat limited |
| Snead-Rock outcrop complex, 14 to 30 percent slopes | 15K | Moderately well drained | D | Very limited | Very limited |
| Haynie silt loam, clayey substratum, 0 to 2 percent slopes, occasionally flooded | 12K | Moderately well drained | B | Very limited | Very limited |
| Nodaway silt loam, 0 to 2 percent slopes, frequently flooded | 11K | Moderately well drained | B | Very limited | Very limited |
| Armster loam, 9 to 14 percent slopes, eroded | 11K | Moderately well drained | C | Very limited | Very limited |
| Sharpsburg silt loam, 5 to 9 percent slopes, eroded | 10K | Moderately well drained | C | Very limited | Very limited |
| Knox silt loam, 5 to 9 percent slopes, eroded | 10K | Well drained | B | Somewhat limited | Somewhat limited |
| Sibley silt loam, 2 to 5 percent slopes | 9K | Well drained | C | Somewhat limited | Very limited |
| Sharpsburg silt loam, 2 to 5 percent slopes | 9K | Moderately well drained | C | Very limited | Very limited |
| Sibley silt loam, 5 to 9 percent slopes | 9K | Well drained | C | Somewhat limited | Very limited |
| Parkville silty clay loam, 0 to 2 percent slopes, occasionally flooded | 9K | Somewhat poorly drained | D | Very limited | Very limited |
| Snead-Rock outcrop complex, 5 to 14 percent slopes | 9K | Moderately well drained | D | Very limited | Very limited |
| Sharpsburg silt loam, 9 to 14 percent slopes, eroded | 7K | Moderately well drained | D | Very limited | Very limited |
| Knox silt loam, 20 to 35 percent slopes, eroded | 7K | Well drained | C | Very limited | Very limited |
| Ladoga silt loam, 9 to 14 percent slopes, eroded | 6K | Moderately well drained | D | Very limited | Very limited |
| Haynie silt loam, 0 to 2 percent slopes, rarely flooded | 6K | Moderately well drained | B | Very limited | Somewhat limited |
| Kennebec silt loam, 1 to 4 percent slopes, frequently flooded | 6K | Moderately well drained | B | Very limited | Very limited |
| Water | 5K | Subaqueous | Not rated | Not rated |
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 79% 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 86% 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.