Seven Devils Area, Idaho

Survey Area ID600• Idaho

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	14K	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	8K	Well drained	B	Very limited	Very limited
Lithic Ultic Argixerolls-Rock outcrop complex, dissected stream breaklands	7K	Well drained	D	Very limited	Very limited
Dystric Cryochrepts-Typic Cryandepts complex, steep moraines	6K	Well drained	B	Very limited	Very limited
Ultic Argixerolls-Rock outcrop complex, dissected stream breaklands, dry	6K	Well drained	C	Very limited	Very limited
Dystric Cryochrepts, glacial trough walls	6K	Well drained	B	Very limited	Very limited
Ultic Argixerolls, steep dissected mountain slopes	6K	Well drained	C	Very limited	Very limited
Dystric Cryochrepts, dissected mountain slopes, basalt and andesite substrata	5K	Well drained	B	Very limited	Very limited
Inceptisols, Mollisols and Alfisols, moderately steep landslide deposits	5K	Well drained	B	Very limited	Very limited
Ultic Argixerolls-Rock outcrop complex, dissected stream breaklands	4K	Well drained	C	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
Klickson-Bluesprin association	4K	Well drained	B	Very limited	Very limited
Rock outcrop	4K		D	Not rated	Not rated
Dystric Cryochrepts, dissected stream breaklands, andesite substratum	4K	Well drained	B	Very limited	Very limited
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.

Mollisols

Fertile grassland soils with thick, dark topsoil. Among the best for agriculture, building, and gardening.

Inceptisols

Young but developing soils found in mountains and river terraces. Variable properties — check drainage and bedrock depth.

Andisols

Volcanic ash soils — light, porous, and fertile. Excellent drainage, but low density can complicate foundations.

What This Means

Building & Foundations

About 89% 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 89% 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.