Harrison County, Missouri
The most common soil here is Shelby, on about 17% of the land: a clay loam, firm and a little sticky. Gara and Grundy come next.
About 30% of the land drains well, and 60% stays wet for long stretches; groundwater comes within two feet of the surface under 44% of it.
USDA rates all 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.
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 Harrison 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 Somewhat poorly drained and the dominant hydrologic group is C (slow infiltration, moderate 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 Harrison 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 |
|---|---|---|---|---|---|
| Grundy silt loam, 2 to 5 percent slopes | 44K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Zook-Colo silty clay loams, 1 to 3 percent slopes, frequently flooded | 43K | Poorly drained | C | Very limited | Very limited |
| Shelby loam, 9 to 14 percent slopes | 38K | Well drained | C | Somewhat limited | Very limited |
| Lagonda silty clay loam, 5 to 9 percent slopes, eroded | 32K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Nodaway silt loam, heavy till, 0 to 2 percent slopes, occasionally flooded | 30K | Moderately well drained | B | Very limited | Very limited |
| Gara loam, 14 to 18 percent slopes | 29K | Well drained | C | Very limited | Very limited |
| Shelby clay loam, 9 to 14 percent slopes, severely eroded | 27K | Well drained | C | Somewhat limited | Very limited |
| Adair clay loam, heavy till, 5 to 9 percent slopes, moderately eroded | 26K | Somewhat poorly drained | D | Very limited | Very limited |
| Lamoni clay loam, 5 to 9 percent slopes, eroded | 25K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Adair loam, 3 to 9 percent slopes | 22K | Somewhat poorly drained | D | Very limited | Very limited |
| Shelby loam, 14 to 18 percent slopes | 18K | Well drained | C | Very limited | Very limited |
| Zook silty clay loam, heavy till, 0 to 2 percent slopes, occasionally flooded | 15K | Poorly drained | D | Very limited | Very limited |
| Gara loam, 9 to 14 percent slopes | 12K | Well drained | C | Somewhat limited | Very limited |
| Grundy silty clay loam, 2 to 5 percent slopes, moderately eroded | 11K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Gara loam, 5 to 9 percent slopes | 9K | Moderately well drained | C | Somewhat limited | Very limited |
| Armstrong loam, 5 to 9 percent slopes | 7K | Somewhat poorly drained | D | Very limited | Very limited |
| Humeston silt loam, 0 to 2 percent slopes, occasionally flooded | 7K | Poorly drained | C/D | Very limited | Very limited |
| Pershing silt loam, 5 to 9 percent slopes | 6K | Somewhat poorly drained | D | Very limited | Very limited |
| Gara clay loam, 9 to 14 percent slopes, severely eroded | 6K | Well drained | C | Somewhat limited | Very limited |
| Wabash silty clay, 0 to 2 percent slopes, frequently flooded | 6K | Very poorly drained | C/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 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 100% 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.