McClain County, Oklahoma
The dominant drainage class is Well 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 McClain County, Oklahoma.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Nash-Lucien complex, 5 to 12 percent slopes | 63K | Well drained | D | Very limited | Very limited |
| Grant silt loam, 3 to 5 percent slopes, eroded | 37K | Well drained | B | Somewhat limited | Somewhat limited |
| Stephenville fine sandy loam, 3 to 5 percent slopes, moderately eroded | 25K | Well drained | C | Somewhat limited | Very limited |
| Nash-Lucien complex, 3 to 5 percent slopes | 13K | Well drained | C | Somewhat limited | Very limited |
| Port silt loam, 0 to 1 percent slopes, occasionally flooded | 13K | Well drained | B | Very limited | Very limited |
| Grant silt loam, 5 to 8 percent slopes, eroded | 13K | Well drained | B | Not limited | Somewhat limited |
| Tamford-Grainola complex, 5 to 12 percent slopes | 13K | Well drained | D | Very limited | Very limited |
| Grant-Port, frequently flooded, complex, 0 to 12 percent slopes | 13K | Well drained | B | Somewhat limited | Somewhat limited |
| Stephenville-Gullied land complex, 1 to 8 percent slopes | 12K | Well drained | C | Somewhat limited | Very limited |
| Gracemore loam, 0 to 1 percent slopes, frequently flooded | 12K | Somewhat poorly drained | A | Very limited | Very limited |
| Renfrow silt loam, 3 to 5 percent slopes, eroded | 12K | Well drained | D | Somewhat limited | Very limited |
| Stephenville fine sandy loam, 3 to 5 percent slopes | 11K | Well drained | C | Somewhat limited | Very limited |
| Keokuk silt loam, 0 to 1 percent slopes, occasionally flooded | 10K | Well drained | B | Very limited | Very limited |
| Water | 8K | D | Not rated | Not rated | |
| Kirkland silt loam, 1 to 3 percent slopes | 7K | Well drained | D | Very limited | Very limited |
| Pulaski fine sandy loam, 0 to 1 percent slopes, occasionally flooded | 7K | Well drained | A | Very limited | Very limited |
| Grant silt loam, 3 to 5 percent slopes | 7K | Well drained | B | Somewhat limited | Somewhat limited |
| Pond Creek silt loam, 1 to 3 percent slopes | 7K | Well drained | B | Somewhat limited | Somewhat limited |
| Gullied land-Grant complex, 3 to 8 percent slopes | 7K | Well drained | C | Not limited | Very limited |
| Ashport, Port and Pulaski soils, 0 to 1 percent slopes, frequently flooded | 7K | Well drained | B | Very limited | Very limited |
What This Means
Building & Foundations
About 44% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 71% 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.