Delaware County, Oklahoma
The dominant drainage class is Somewhat excessively 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 Delaware County, Oklahoma.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Clarksville very gravelly silt loam, 20 to 50 percent slopes, stony | 115K | Somewhat excessively drained | B | Very limited | Very limited |
| Clarksville very gravelly silt loam, 1 to 8 percent slopes | 63K | Somewhat excessively drained | B | Not limited | Very limited |
| Clarksville very gravelly silt loam, 5 to 20 percent slopes, stony | 54K | Somewhat excessively drained | B | Somewhat limited | Somewhat limited |
| Razort gravelly loam, 0 to 3 percent slopes, occasionally flooded | 39K | Well drained | B | Very limited | Very limited |
| Water | 36K | Subaqueous | Not rated | Not rated | |
| Doniphan gravelly silt loam, 1 to 3 percent slopes | 26K | Well drained | B | Not limited | Somewhat limited |
| Britwater gravelly silt loam, 3 to 8 percent slopes | 17K | Well drained | B | Not limited | Somewhat limited |
| Doniphan-Tonti complex, 3 to 5 percent slopes | 17K | Well drained | B | Not limited | Somewhat limited |
| Macedonia silt loam, 1 to 3 percent slopes | 15K | Well drained | B | Not limited | Somewhat limited |
| Captina silt loam, 1 to 3 percent slopes | 15K | Moderately well drained | C/D | Very limited | Very limited |
| Eldorado silt loam, 1 to 3 percent slopes | 13K | Well drained | B | Not limited | Somewhat limited |
| Eldorado stony silt loam, 3 to 12 percent slopes | 9K | Well drained | C | Not limited | Very limited |
| Tonti gravelly silt loam, 1 to 3 percent slopes | 9K | Moderately well drained | D | Very limited | Very limited |
| Dennis silt loam, 1 to 3 percent slopes | 9K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Britwater silt loam, 1 to 3 percent slopes | 7K | Well drained | B | Not limited | Somewhat limited |
| Eldorado silt loam, 3 to 5 percent slopes | 7K | Well drained | C | Somewhat limited | Very limited |
| Taloka silt loam, 0 to 1 percent slopes | 6K | Somewhat poorly drained | D | Very limited | Very limited |
| Stigler silt loam, 0 to 1 percent slopes | 6K | Somewhat poorly drained | D | Very limited | Very limited |
| Jay silt loam, 1 to 3 percent slopes | 5K | Moderately well drained | C | Very limited | Very limited |
| Mayes silt loam, 0 to 1 percent slopes | 5K | Poorly drained | D | 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 60% of soils are rated "very limited" for septic absorption fields. The well-drained soils may actually drain too fast for standard leach fields, allowing effluent to reach groundwater. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Soils tend to drain very quickly, meaning nutrients and water don't stick around long. Raised beds with amended soil, drip irrigation, and heavy mulching will give the best results. Compost is your best friend here — it improves water retention dramatically.