Harper 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 Harper County, Oklahoma.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Quinlan-Rock outcrop-Yomont complex, 0 to 45 percent slopes | 53K | Well drained | D | Very limited | Very limited |
| Selman silt loam, 1 to 3 percent slopes | 49K | Well drained | B | Not limited | Somewhat limited |
| Quinlan-Woodward-Deepwood complex, 5 to 12 percent slopes | 48K | Well drained | D | Very limited | Very limited |
| Westola-Quinlan-Hardeman complex, 0 to 12 percent slopes | 42K | Well drained | B | Very limited | Very limited |
| Woodward-Quinlan complex, 3 to 5 percent slopes | 35K | Well drained | C | Somewhat limited | Very limited |
| Tivoli fine sand, 5 to 12 percent slopes | 21K | Excessively drained | A | Somewhat limited | Very limited |
| Eda sand, 1 to 12 percent slopes | 21K | Somewhat excessively drained | A | Not limited | Very limited |
| St. Paul silt loam, 1 to 3 percent slopes | 19K | Well drained | C | Somewhat limited | Very limited |
| Selman silt loam, 3 to 5 percent slopes | 18K | Well drained | B | Not limited | Somewhat limited |
| Woodward-Quinlan complex, 1 to 3 percent slopes | 17K | Well drained | C | Somewhat limited | Very limited |
| Cottonwood-Rock outcrop-Vinson complex, 3 to 12 percent slopes | 14K | Well drained | D | Very limited | Very limited |
| Rock outcrop-Cottonwood complex, 12 to 80 percent slopes | 13K | D | Very limited | Very limited | |
| St. Paul silt loam, 0 to 1 percent slopes | 13K | Well drained | C | Somewhat limited | Very limited |
| Hardeman fine sandy loam, 1 to 3 percent slopes, cool | 12K | Well drained | A | Not limited | Very limited |
| Lincoln sand, 0 to 1 percent slopes, occasionally flooded | 12K | Somewhat excessively drained | A | Very limited | Very limited |
| Jester loamy fine sand, 1 to 5 percent slopes | 12K | Excessively drained | A | Not limited | Very limited |
| Tivoli fine sand, 12 to 45 percent slopes | 10K | Excessively drained | A | Very limited | Very limited |
| Alopark-Mocane complex, 1 to 3 percent slopes | 9K | Well drained | A | Not limited | Not limited |
| Grandfield fine sandy loam, 1 to 3 percent slopes | 9K | Well drained | B | Not limited | Very limited |
| Quinlan-Woodward complex, 5 to 8 percent slopes | 9K | Well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 46% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.
Septic Systems
About 82% 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.