Wibaux County, Montana
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 Wibaux County, Montana.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Bainville-Chama silt loams, 15 to 30 percent slopes | 48K | Well drained | D | Very limited | Very limited |
| Rockland-Bainville complex, 15 to 50 percent slopes | 48K | Not rated | Not rated | ||
| Chama silt loam, 4 to 7 percent slopes | 40K | Well drained | C | Somewhat limited | Very limited |
| Golva silt loam, 2 to 6 percent slopes | 37K | Well drained | B | Not limited | Somewhat limited |
| Badland | 24K | Not rated | Not rated | ||
| Chama-Bainville silt loams, 10 to 14 percent slopes | 22K | Well drained | C | Somewhat limited | Very limited |
| Regent-Wyola silty clay loams, 3 to 6 percent slopes | 20K | Well drained | C | Very limited | Very limited |
| Lonna-Cabbart silt loams, 6 to 35 percent slopes | 18K | Well drained | B | Very limited | Somewhat limited |
| Golva silt loam, 0 to 2 percent slopes | 16K | Well drained | B | Not limited | Somewhat limited |
| Bainville-Flasher complex, 15 to 40 percent slopes | 16K | Well drained | D | Very limited | Very limited |
| Bainville-Wibaux complex, 15 to 40 percent slopes | 16K | Well drained | D | Very limited | Very limited |
| Pierre-Lismas clays, 15 to 40 percent slopes | 15K | Well drained | D | Very limited | Very limited |
| Alluvial land | 14K | Well drained | B | Very limited | Very limited |
| Midway-Moreau complex, 12 to 30 percent slopes | 14K | Well drained | D | Very limited | Very limited |
| Badland, 9 to 150 percent slopes | 11K | Very limited | Very limited | ||
| Midway-Regent silty clay loams, 3 to 7 percent slopes | 10K | Well drained | D | Very limited | Very limited |
| Lismas clay-Shale outcrop, 20 to 60 percent slopes | 10K | Well drained | D | Very limited | Very limited |
| Korell loam, 0 to 2 percent slopes, rarely flooded | 8K | Well drained | C | Very limited | Very limited |
| Chama-Cabba-Sen silt loams, 6 to 9 percent slopes | 8K | Well drained | C | Somewhat limited | Very limited |
| Korchea-Fluvaquents complex, channeled, 0 to 2 percent slopes, frequently flooded | 8K | Somewhat poorly drained | C | Very limited | Very limited |
What This Means
Building & Foundations
About 51% 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 64% 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.