Franklin County Area, Idaho
The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate 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 Franklin County Area, Idaho.
| Soil Map Unit | Acres | Drainage | Hydro Group | Dwellings | Septic |
|---|---|---|---|---|---|
| Yeates Hollow, extremely stony surface-Manila-Softback complex, 12 to 40 percent slopes | 22K | Well drained | C | Very limited | Very limited |
| Oxford-Banida complex, 12 to 30 percent slopes | 11K | Moderately well drained | D | Very limited | Very limited |
| Manila-Broadhead complex, 12 to 30 percent slopes | 9K | Well drained | C | Very limited | Very limited |
| Parleys silt loam, 0 to 4 percent slopes | 9K | Well drained | C | Somewhat limited | Very limited |
| Wheelon-Collinston complex, 4 to 12 percent slopes | 7K | Well drained | C | Somewhat limited | Very limited |
| Manila-Broadhead complex, 4 to 12 percent slopes | 6K | Well drained | C | Somewhat limited | Very limited |
| Oxford-Banida complex, 4 to 12 percent slopes | 6K | Moderately well drained | D | Very limited | Very limited |
| Ant Flat silty clay loam, 0 to 2 percent slopes | 6K | Well drained | C | Very limited | Very limited |
| Bergquist-Softback complex, 25 to 65 percent slopes | 5K | Well drained | A | Very limited | Very limited |
| Kidman fine sandy loam, 0 to 2 percent slopes | 5K | Well drained | B | Not limited | Somewhat limited |
| Hondoho, stony surface-Sprollow-Hades complex, 12 to 50 percent slopes | 5K | Well drained | C | Very limited | Very limited |
| Windernot-Lewnot-Stinkcreek complex, 0 to 2 percent slopes | 5K | Moderately well drained | A | Somewhat limited | Very limited |
| Battle Creek silty clay loam, 0 to 2 percent slopes | 5K | Moderately well drained | D | Very limited | Very limited |
| Vitale, extremely stony surface-Yeates Hollow, extremely stony surface-Northwater complex, 12 to 40 percent slopes | 5K | Well drained | C | Very limited | Very limited |
| Lanoak-Broadhead complex, 12 to 30 percent slopes | 4K | Well drained | B | Very limited | Very limited |
| Ireland-Polumar complex, 25 to 55 percent slopes | 4K | Well drained | C | Very limited | Very limited |
| Foxol, very stony surface-Vitale, extremely stony surface complex, 20 to 55 percent slopes | 4K | Well drained | D | Very limited | Very limited |
| Wheelon-Collinston complex, 12 to 20 percent slopes | 4K | Well drained | C | Very limited | Very limited |
| Vitale, extremely stony surface-Bergquist-Rock outcrop complex, 30 to 60 percent slopes | 4K | Well drained | C | Very limited | Very limited |
| Yeates Hollow-Vitale complex, 25 to 50 percent slopes | 4K | Well drained | C | 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 95% 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.