Pawnee 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 Pawnee County, Oklahoma.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Niotaze-Bigheart-Rock outcrop complex, 3 to 15 percent slopes, extremely stony | 31K | Somewhat poorly drained | D | Very limited | Very limited |
| Foraker-Shidler-Lucien complex, 3 to 12 percent slopes, very rocky | 27K | Moderately well drained | D | Very limited | Very limited |
| Water | 20K | D | Not rated | Not rated | |
| Ashport, Port and Pulaski soils, 0 to 1 percent slopes, frequently flooded | 18K | Well drained | B | Very limited | Very limited |
| Coyle-Lucien complex, 1 to 5 percent slopes | 13K | Well drained | C | Somewhat limited | Very limited |
| Grainola-Shidler-Lucien complex, 1 to 20 percent slopes, very rocky | 13K | Well drained | D | Very limited | Very limited |
| Niotaze-Bigheart-Rock outcrop complex, 15 to 25 percent slopes, extremely stony | 13K | Somewhat poorly drained | D | Very limited | Very limited |
| Grainola-Lucien complex, 1 to 5 percent slopes | 13K | Well drained | D | Very limited | Very limited |
| Grainola-Lucien complex, 5 to 12 percent slopes | 12K | Well drained | D | Somewhat limited | Very limited |
| Bartlesville-Bigheart complex, 1 to 5 percent slopes, very rocky | 11K | Moderately well drained | C | Very limited | Very limited |
| Grainola-Ashport frequently flooded-Mulhall complex, 0 to 8 percent slopes | 11K | Well drained | B | Not rated | Very limited |
| Steedman-Lucien complex, 5 to 12 percent slopes, very rocky | 11K | Moderately well drained | D | Very limited | Very limited |
| Renfrow silt loam, 3 to 5 percent slopes, eroded | 10K | Well drained | D | Somewhat limited | Very limited |
| Renfrow silt loam, 1 to 3 percent slopes | 9K | Well drained | D | Very limited | Very limited |
| Renfrow silt loam, 3 to 5 percent slopes | 9K | Well drained | D | Very limited | Very limited |
| Agra silt loam, 3 to 5 percent slopes, eroded | 8K | Moderately well drained | D | Very limited | Very limited |
| Norge silt loam, 1 to 3 percent slopes | 7K | Well drained | B | Somewhat limited | Somewhat limited |
| Norge silt loam, 3 to 5 percent slopes, eroded | 7K | Well drained | C | Somewhat limited | Very limited |
| Grainola-Rock outcrop-Lucien complex, 5 to 20 percent slopes | 6K | Well drained | D | Very limited | Very limited |
| Stephenville-Darnell complex, 3 to 8 percent slopes, rocky | 6K | Well drained | C | Somewhat limited | Very limited |
What This Means
Building & Foundations
About 66% 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. A geotechnical assessment is recommended before building.
Septic Systems
About 89% 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
Well-drained soils on sloped terrain — good for most plants but watch for erosion. Terracing, contour planting, and mulching help retain moisture and topsoil. Drip irrigation is more effective than sprinklers on slopes.