Adair County, Oklahoma
The dominant drainage class is Somewhat excessively 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 Adair County, Oklahoma.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Clarksville very gravelly silt loam, 20 to 50 percent slopes, stony | 90K | Somewhat excessively drained | B | Very limited | Very limited |
| Enders-Linker-Hector association, 5 to 30 percent slopes | 81K | Well drained | D | Very limited | Very limited |
| Clarksville very gravelly silt loam, 1 to 8 percent slopes | 56K | Somewhat excessively drained | B | Not limited | Very limited |
| Tonti gravelly silt loam, 0 to 3 percent slopes | 22K | Moderately well drained | C/D | Very limited | Very limited |
| Waben gravelly silt loam, 3 to 8 percent slopes | 19K | Well drained | C | Not limited | Very limited |
| Clarksville stony silt loam, 5 to 15 percent slopes | 16K | Somewhat excessively drained | B | Somewhat limited | Somewhat limited |
| Captina silt loam, 1 to 3 percent slopes | 13K | Moderately well drained | C/D | Very limited | Very limited |
| Hector-Linker complex, 1 to 5 percent slopes | 13K | Well drained | D | Very limited | Very limited |
| Elsah gravelly silt loam, 0 to 1 percent slopes, frequently flooded | 12K | Well drained | B | Very limited | Very limited |
| Waben gravelly silt loam, 1 to 3 percent slopes | 11K | Well drained | A | Not limited | Very limited |
| Britwater silt loam, 1 to 3 percent slopes | 7K | Well drained | B | Not limited | Somewhat limited |
| Jay silt loam, 0 to 2 percent slopes | 4K | Moderately well drained | C/D | Very limited | Very limited |
| Elsah gravelly loam, 0 to 1 percent slopes, occasionally flooded | 3K | Well drained | B | Very limited | Very limited |
| Linker fine sandy loam, 3 to 5 percent slopes | 3K | Well drained | C | Very limited | Very limited |
| Razort silt loam, 0 to 1 percent slopes, occasionally flooded | 2K | Well drained | C | Very limited | Very limited |
| Stigler silt loam, 0 to 1 percent slopes | 2K | Somewhat poorly drained | D | Very limited | Very limited |
| Sogn silty clay loam, 1 to 12 percent slopes | 2K | Somewhat excessively drained | D | Very limited | Very limited |
| Britwater silt loam, 0 to 1 percent slopes | 2K | Well drained | B | Not limited | Somewhat limited |
| Apperson silty clay loam, 1 to 3 percent slopes | 2K | Somewhat poorly drained | D | Very limited | Very limited |
| Linker loam, 3 to 5 percent slopes | 2K | Well drained | C | Very limited | Very limited |
What This Means
Building & Foundations
About 69% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, poor drainage in some areas, flood-prone areas, sandy or gravelly soils with low bearing capacity. A geotechnical assessment is recommended before building.
Septic Systems
About 93% of soils are rated "very limited" for septic absorption fields. The well-drained soils may actually drain too fast for standard leach fields, allowing effluent to reach groundwater. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Soils tend to drain very quickly, meaning nutrients and water don't stick around long. Raised beds with amended soil, drip irrigation, and heavy mulching will give the best results. Compost is your best friend here — it improves water retention dramatically.