Johnson County, Wyoming, Southern Part
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 Johnson County, Wyoming, Southern Part.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Samday-Shingle-Badland complex, 10 to 45 percent slopes | 78K | Well drained | D | Very limited | Very limited |
| Shingle-Tassel complex, 2 to 30 percent slopes | 73K | Well drained | D | Very limited | Very limited |
| Shingle-Kishona-Samsil, dry complex, 3 to 30 percent slopes | 54K | Well drained | D | Very limited | Very limited |
| Renohill-Razor-Samsil, dry complex, 6 to 20 percent slopes | 46K | Well drained | D | Very limited | Very limited |
| Razor-Gaynor, dry-Samsil, dry complex, 6 to 30 percent slopes | 41K | Well drained | D | Very limited | Very limited |
| Cambria-Cushman complex, 6 to 20 percent slopes | 31K | Well drained | B | Somewhat limited | Somewhat limited |
| Parmleed-Renohill complex, 6 to 20 percent slopes | 31K | Well drained | D | Very limited | Very limited |
| Parmleed-Lohsman-Cadoma complex, 6 to 10 percent slopes | 28K | Well drained | D | Very limited | Very limited |
| Starley-Rock outcrop complex, steep | 27K | Well drained | D | Very limited | Very limited |
| Spearfish-Shale outcrop complex, steep | 25K | Well drained | D | Very limited | Very limited |
| Sunup-Carnero association | 25K | Well drained | D | Very limited | Very limited |
| Badland | 23K | D | Very limited | Very limited | |
| Rock outcrop | 23K | D | Not rated | Not rated | |
| Sunup, cool moist-Rock outcrop complex, 20 to 40 percent slopes | 22K | Well drained | D | Very limited | Very limited |
| Terro-Tassel-Shingle complex, 6 to 40 percent slopes | 20K | Well drained | D | Very limited | Very limited |
| Shingle-Cushman complex, 10 to 30 percent slopes | 17K | Well drained | D | Very limited | Very limited |
| Decross-Woosley association | 16K | Well drained | C | Very limited | Very limited |
| Cloud Peak-Dell association | 16K | Well drained | C | Very limited | Very limited |
| Shingle-Kishona-Zigweid loams, 6 to 30 percent slopes | 15K | Well drained | B | Somewhat limited | Somewhat limited |
| Cushman-Parmleed-Renohill complex, 6 to 20 percent slopes | 14K | Well drained | D | Very limited | Very limited |
What This Means
Building & Foundations
About 88% 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 88% 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.