Johnston 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 Johnston County, Oklahoma.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Kiti-Rock outcrop complex, 1 to 25 percent slopes | 46K | Well drained | D | Very limited | Very limited |
| Claremore-Rock outcrop complex, 1 to 5 percent slopes | 34K | Well drained | D | Very limited | Very limited |
| Chigley-Rock outcrop complex, 1 to 8 percent slopes | 29K | Moderately well drained | C | Somewhat limited | Very limited |
| Chigley gravelly sandy loam, 1 to 3 percent slopes | 24K | Moderately well drained | C | Somewhat limited | Very limited |
| Gasil fine sandy loam, cool, 1 to 5 percent slopes, eroded | 23K | Well drained | B | Not limited | Somewhat limited |
| Agan silt loam, 0 to 2 percent slopes | 21K | Moderately well drained | D | Very limited | Very limited |
| Verdigris silty clay loam, 0 to 1 percent slopes, occasionally flooded | 17K | Well drained | B | Very limited | Very limited |
| Lula loam, 1 to 3 percent slopes | 17K | Well drained | B | Somewhat limited | Somewhat limited |
| Gasil fine sandy loam, 3 to 5 percent slopes, severely eroded | 14K | Well drained | B | Not limited | Somewhat limited |
| Gasil fine sandy loam, cool, 3 to 5 percent slopes | 13K | Well drained | B | Not limited | Somewhat limited |
| Gasil fine sandy loam, cool, 1 to 3 percent slopes | 12K | Well drained | B | Not limited | Somewhat limited |
| Burleson clay, 1 to 3 percent slopes | 12K | Moderately well drained | D | Very limited | Very limited |
| Gasil fine sandy loam, 8 to 12 percent slopes | 12K | Well drained | B | Somewhat limited | Somewhat limited |
| Durant loam, 1 to 3 percent slopes | 12K | Moderately well drained | D | Very limited | Very limited |
| Scullin-Kiti complex, 2 to 6 percent slopes | 11K | Well drained | C | Very limited | Very limited |
| Water | 9K | D | Not rated | Not rated | |
| Tribbey fine sandy loam, 0 to 2 percent slopes, frequently flooded | 9K | Somewhat poorly drained | B | Very limited | Very limited |
| Stephenville fine sandy loam, 3 to 5 percent slopes | 9K | Well drained | C | Somewhat limited | Very limited |
| Claremore-Lula complex, 3 to 5 percent slopes | 7K | Well drained | D | Very limited | Very limited |
| Wilson silt loam, 0 to 1 percent slopes | 7K | Moderately well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 52% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 70% 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.