Cassia County, Idaho, Eastern Part
The dominant drainage class is Well 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 Cassia County, Idaho, Eastern Part.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Ireland-Hymas association, 35 to 55 percent slopes | 26K | Well drained | C | Very limited | Very limited |
| Bahem silt loam, 1 to 3 percent slopes | 24K | Well drained | B | Not limited | Somewhat limited |
| Darkbull loam, 0 to 1 percent slopes | 23K | Well drained | B | Not limited | Very limited |
| Darkbull loam, 1 to 4 percent slopes | 20K | Well drained | B | Not limited | Very limited |
| Bahem-Portneuf complex, 0 to 1 percent slopes | 19K | Well drained | B | Not limited | Somewhat limited |
| Declo silt loam, 1 to 3 percent slopes | 17K | Well drained | B | Not limited | Somewhat limited |
| Bancroft silt loam, 3 to 12 percent slopes | 17K | Well drained | B | Not limited | Very limited |
| Genola silt loam, 0 to 1 percent slopes | 17K | Well drained | B | Not limited | Very limited |
| Declo silt loam, saline, 1 to 3 percent slopes | 17K | Well drained | B | Not limited | Somewhat limited |
| Trevino-Rock outcrop complex, 2 to 12 percent slopes | 17K | Well drained | D | Very limited | Very limited |
| Idahome silt loam, 1 to 3 percent slopes | 15K | Well drained | B | Not limited | Somewhat limited |
| Ririe-Heglar association, 5 to 30 percent slopes | 15K | Well drained | B | Very limited | Very limited |
| Trevino-Paulville complex, 0 to 8 percent slopes | 15K | Well drained | D | Very limited | Very limited |
| Jimsage-Vitale association, 30 to 65 percent slopes | 15K | Well drained | B | Very limited | Very limited |
| Scoon very fine sandy loam, 1 to 4 percent slopes | 15K | Well drained | D | Very limited | Very limited |
| Strevell silt loam, 1 to 3 percent slopes | 14K | Well drained | B | Not limited | Somewhat limited |
| Thornock cobbly fine sandy loam, 2 to 8 percent slopes | 14K | Well drained | D | Very limited | Very limited |
| Heglar silt loam, 1 to 3 percent slopes | 14K | Well drained | B | Not limited | Somewhat limited |
| Heglar silt loam, 3 to 8 percent slopes | 13K | Well drained | B | Not limited | Somewhat limited |
| Acord stony loam, 4 to 12 percent slopes | 12K | Well drained | C | Somewhat limited | Very limited |
What This Means
Building & Foundations
About 34% 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. 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.