Tillman County, Oklahoma
The dominant drainage class is Well drained and the dominant hydrologic group is D (very slow infiltration, high runoff). 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 Tillman County, Oklahoma.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Tillman and Foard soils, 1 to 3 percent slopes | 45K | Well drained | C | Very limited | Very limited |
| Vernon-Knoco complex, 3 to 12 percent slopes | 35K | Well drained | D | Very limited | Very limited |
| Tipton loam, 0 to 1 percent slopes | 34K | Well drained | B | Somewhat limited | Somewhat limited |
| Tillman-Hinkle complex, 1 to 3 percent slopes | 30K | Well drained | C | Very limited | Very limited |
| Lincoln and Gracemore soils, 0 to 1 percent slopes, frequently flooded | 28K | Somewhat excessively drained | A | Very limited | Very limited |
| Tipton fine sandy loam, 0 to 1 percent slopes | 28K | Well drained | B | Somewhat limited | Very limited |
| Foard-Hinkle complex, 0 to 1 percent slopes | 28K | Well drained | D | Very limited | Not limited |
| Hollister silt loam, 0 to 1 percent slopes | 24K | Well drained | C | Very limited | Very limited |
| Foard silt loam, 0 to 1 percent slopes | 23K | Well drained | D | Very limited | Not limited |
| Clairemont silty clay loam, 0 to 1 percent slopes, channeled, frequently flooded | 20K | Well drained | B | Very limited | Very limited |
| Indiahoma silty clay loam, 1 to 3 percent slopes | 18K | Well drained | D | Very limited | Very limited |
| Devol fine sandy loam, 0 to 1 percent slopes | 15K | Well drained | A | Not limited | Very limited |
| Abilene loam, 0 to 1 percent slopes | 14K | Well drained | C | Somewhat limited | Very limited |
| Grandfield-Grandmore complex, 0 to 3 percent slopes | 14K | Well drained | B | Not limited | Very limited |
| Water | 13K | D | Not rated | Not rated | |
| Jester loamy fine sand, 3 to 8 percent slopes | 12K | Excessively drained | A | Not limited | Very limited |
| Grandfield and Farry soils, 1 to 3 percent slopes | 12K | Well drained | B | Not limited | Very limited |
| Devol loamy sand, 0 to 3 percent slopes | 12K | Well drained | A | Not limited | Very limited |
| Vernon clay, 3 to 5 percent slopes, eroded | 11K | Well drained | D | Very limited | Very limited |
| Wheatwood silt loam, 0 to 1 percent slopes, occasionally flooded | 11K | Well drained | B | Very limited | Very limited |
What This Means
Building & Foundations
About 63% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 77% 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
Drainage is generally favorable for gardening. Adding compost and mulch will improve fertility and water retention. Test your soil's pH before planting — most vegetables prefer 6.0-7.0.