Franklin County Area, Idaho
The most common soil here is Manila, on about 6% of the land: a silt loam, smooth, like flour. Yeates Hollow and Oxford come next.
About 77% of the land drains well, and 7% stays wet for long stretches; groundwater comes within two feet of the surface under 4% of it.
USDA rates 92% of the land very limited for a standard septic drain field, and 72% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: 1% of the land floods occasionally or more, and bedrock lies within 40 inches under 22% of it.
Soils change over short distances, so look up an address below for the soil at that exact spot and the reasons behind each rating.
The soils you're most likely standing on
The biggest named soils in Franklin County Area, Idaho, each drawn five feet deep from its official USDA description, in its recorded colors.
Dots mark gravel; white flecks mark lime. Shares are by acres across the survey area, and each mapped patch usually mixes several of these soils.
The biggest mapped areas
The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). The most common soil order is Mollisols — grassland soils with a thick, dark, fertile topsoil rich in organic matter. 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. Search your address to find the exact soil composition, drainage, and series details at your specific location.
| 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 |
Soil Orders in This Area
The USDA classifies every soil into one of 12 soil orders. Here are the dominant orders found in this survey area.
What This Means
Building & Foundations
About 72% 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 92% 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.