Seven Devils Area, Idaho
The most common soil here is Dystric Cryochrepts, on about 19% of the land. Ultic Argixerolls and Cryepts come next.
About 87% of the land drains well.
USDA rates 87% of the land very limited for a standard septic drain field, and 86% very limited for homes with basements. That means extra cost or special design, not that it can't be done.
Worth knowing: bedrock lies within 40 inches under 27% 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 Seven Devils 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 B (moderate infiltration). 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 Seven Devils 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 |
|---|---|---|---|---|---|
| Dystric Cryochrepts, glacial trough bottoms | 13K | Well drained | B | Very limited | Very limited |
| Ultic Argixerolls, dissected stream breaklands, moist | 11K | Well drained | C | Very limited | Very limited |
| Ultic Argixerolls, dissected mountain slopes, moist | 9K | Well drained | C | Very limited | Very limited |
| Rock outcrop-Cryepts-Rubble land complex, 40 to 70 percent slopes, glacial cirques | 9K | D | Not rated | Not rated | |
| Dystric Cryochrepts, steep glacial trough walls | 8K | Well drained | B | Very limited | Very limited |
| Dystric Cryochrepts-Rock outcrop complex, very steep glacial trough walls, andesite substratum | 7K | Well drained | B | Very limited | Very limited |
| Lithic Ultic Argixerolls-Rock outcrop complex, dissected stream breaklands | 7K | Well drained | D | Very limited | Very limited |
| Ultic Argixerolls-Rock outcrop complex, dissected stream breaklands, dry | 6K | Well drained | C | Very limited | Very limited |
| Ultic Argixerolls, steep dissected mountain slopes | 6K | Well drained | C | Very limited | Very limited |
| Dystric Cryochrepts-Typic Cryandepts complex, steep moraines | 5K | Well drained | B | Very limited | Very limited |
| Dystric Cryochrepts, glacial trough walls | 5K | Well drained | B | Very limited | Very limited |
| Inceptisols, Mollisols and Alfisols, moderately steep landslide deposits | 5K | Well drained | B | Very limited | Very limited |
| Dystric Cryochrepts, dissected mountain slopes, basalt and andesite substrata | 5K | Well drained | B | Very limited | Very limited |
| Cryepts-Rock outcrop complex, 5 to 55 percent slopes, glacial trough bottoms | 4K | Well drained | B | Very limited | Very limited |
| Brody-Wapshilla association | 4K | Well drained | B | Very limited | Very limited |
| Ultic Argixerolls-Rock outcrop complex, dissected stream breaklands | 4K | Well drained | C | Very limited | Very limited |
| Klickson-Bluesprin association | 4K | Well drained | B | Very limited | Very limited |
| Dystric Cryochrepts, dissected stream breaklands, andesite substratum | 4K | Well drained | B | Very limited | Very limited |
| Rock outcrop | 3K | D | Not rated | Not rated | |
| Ultic Argixerolls, undissected stream breaklands, dry | 3K | 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 86% 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 87% 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.