Ziebach County, South Dakota
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 Ziebach County, South Dakota.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Samsil clay, 15 to 45 percent slopes | 97K | Well drained | D | Very limited | Very limited |
| Pierre-Samsil clays, 9 to 30 percent slopes | 82K | Well drained | D | Very limited | Very limited |
| Sansarc-Opal clays, 9 to 25 percent slopes | 75K | Well drained | D | Very limited | Very limited |
| Lantry-Cabba complex, 9 to 30 percent slopes | 74K | Well drained | C | Very limited | Very limited |
| Reeder-Lantry complex, 2 to 9 percent slopes | 71K | Well drained | C | Somewhat limited | Very limited |
| Vebar-Daglum complex, 3 to 9 percent slopes | 59K | Well drained | B | Somewhat limited | Very limited |
| Rhoades-Daglum complex, 0 to 6 percent slopes | 54K | Moderately well drained | D | Very limited | Somewhat limited |
| Regent-Rhoades complex, 2 to 9 percent slopes | 53K | Well drained | D | Very limited | Very limited |
| Pierre clay, 2 to 6 percent slopes | 51K | Well drained | D | Very limited | Very limited |
| Regent silty clay loam, 3 to 6 percent slopes | 46K | Well drained | D | Very limited | Very limited |
| Bullock-Parchin fine sandy loams, 0 to 9 percent slopes | 39K | Well drained | D | Somewhat limited | Very limited |
| Reeder-Rhoades-Lantry complex, 2 to 9 percent slopes | 31K | Well drained | C | Somewhat limited | Very limited |
| Vebar-Cohagen fine sandy loam, 6 to 15 percent slopes | 30K | Well drained | B | Somewhat limited | Very limited |
| Pierre clay, 6 to 9 percent slopes | 28K | Well drained | D | Very limited | Very limited |
| Daglum-Rhoades loams, 2 to 6 percent slopes | 27K | Well drained | C | Very limited | Very limited |
| Kyle clay, 2 to 6 percent slopes | 25K | Well drained | D | Very limited | Very limited |
| Cohagen-Vebar-Bullock fine sandy loams, 6 to 25 percent slopes | 23K | Well drained | D | Very limited | Very limited |
| Rhoades-Daglum complex, 6 to 9 percent slopes | 21K | Well drained | D | Very limited | Somewhat limited |
| Cabba-Lantry complex, 25 to 40 percent slopes | 21K | Well drained | D | Very limited | Very limited |
| Cohagen-Vebar fine sandy loams, 15 to 40 percent slopes | 19K | Well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 75% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes. A geotechnical assessment is recommended before building.
Septic Systems
About 91% 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.