Ottawa County, Oklahoma
The dominant drainage class is Somewhat poorly 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 Ottawa County, Oklahoma.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Taloka silt loam, 0 to 1 percent slopes | 42K | Somewhat poorly drained | D | Very limited | Very limited |
| Dennis silt loam, 1 to 3 percent slopes | 40K | Somewhat poorly drained | C/D | Very limited | Very limited |
| Clarksville stony silt loam, 12 to 50 percent slopes | 39K | Somewhat excessively drained | A | Very limited | Very limited |
| Clarksville very gravelly silt loam, 1 to 8 percent slopes | 34K | Somewhat excessively drained | B | Not limited | Very limited |
| Parsons silt loam, 0 to 1 percent slopes | 20K | Somewhat poorly drained | D | Very limited | Very limited |
| Osage silty clay, 0 to 1 percent slopes, occasionally flooded | 12K | Poorly drained | D | Very limited | Very limited |
| Parsons silt loam, 1 to 3 percent slopes | 10K | Somewhat poorly drained | D | Very limited | Very limited |
| Water | 10K | Not rated | Not rated | ||
| Verdigris silt loam, 0 to 1 percent slopes, occasionally flooded | 8K | Well drained | B | Very limited | Very limited |
| Healing silt loam, 0 to 1 percent slopes, occasionally flooded | 7K | Well drained | B | Very limited | Very limited |
| Eram-Verdigris complex, 0 to 20 percent slopes | 6K | Moderately well drained | D | Very limited | Very limited |
| Craig silt loam, 1 to 3 percent slopes | 6K | Well drained | C | Not limited | Very limited |
| Mayes silty clay loam, 0 to 1 percent slopes | 6K | Poorly drained | D | Very limited | Very limited |
| Britwater silt loam, 0 to 3 percent slopes | 6K | Well drained | B | Not limited | Somewhat limited |
| Clarksville gravelly silt loam, 0 to 3 percent slopes | 5K | Somewhat excessively drained | A | Not limited | Somewhat limited |
| Eldorado gravelly silt loam, 1 to 8 percent slopes | 5K | Well drained | B | Not limited | Somewhat limited |
| Dumps, mine | 5K | Not rated | Not rated | ||
| Choteau silt loam, 1 to 3 percent slopes | 4K | Somewhat poorly drained | C | Somewhat limited | Very limited |
| Newtonia silt loam, 1 to 3 percent slopes | 4K | Well drained | B | Somewhat limited | Somewhat limited |
| Bates loam, 3 to 5 percent slopes | 4K | Well drained | C | Somewhat limited | Very limited |
What This Means
Building & Foundations
About 69% of soils are rated "very limited" for dwellings with basements. Specific challenges include steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.
Septic Systems
About 87% of soils are rated "very limited" for septic absorption fields. Poorly drained soils can't absorb septic effluent effectively. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.
Gardening & Agriculture
Many soils hold water for extended periods. Raised beds are highly recommended to improve drainage for vegetables. Well-adapted native plants and water-loving species will do best in natural conditions.