Cassia County, Idaho, West Part

Survey Area ID707• Idaho

The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate runoff). The most common soil order is Aridisols — dry-climate soils with limited organic matter and often calcium carbonate accumulation. 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, West Part. 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
Buko-Paniogue complex	31K	Well drained	C	Not limited	Somewhat limited
Mackey-Rock outcrop complex	21K	Well drained	C	Very limited	Very limited
Aysees gravelly loam, 1 to 12 percent slopes	17K	Somewhat excessively drained	B	Not limited	Very limited
Drax silt loam	17K	Moderately well drained	C	Very limited	Very limited
Portneuf silt loam, 1 to 3 percent slopes	17K	Well drained	C	Not limited	Very limited
Weeks loam, 1 to 3 percent slopes	14K	Well drained	C	Somewhat limited	Very limited
Portneuf silt loam, 0 to 1 percent slopes	13K	Well drained	C	Not limited	Very limited
Bedke silt loam, 3 to 12 percent slopes	12K	Well drained	C	Not limited	Somewhat limited
Declo loam, 0 to 1 percent slopes	11K	Well drained	B	Not limited	Somewhat limited
Itca-Kanlee complex	10K	Well drained	D	Very limited	Very limited
Alpowa gravelly loam, 20 to 60 percent slopes	10K	Well drained	A	Very limited	Very limited
Wodskow sandy loam, drained	9K	Well drained	A	Very limited	Somewhat limited
Reywat gravelly loam, 0 to 30 percent slopes	8K	Well drained	D	Very limited	Very limited
Portneuf silt loam, 3 to 7 percent slopes	7K	Well drained	C	Not limited	Very limited
Paniogue-Buko complex	7K	Well drained	B	Not limited	Very limited
Beetville loam	7K	Moderately well drained	B	Somewhat limited	Very limited
Trevino-Rock outcrop complex	7K	Well drained	D	Very limited	Very limited
Mulett very cobbly loam, 4 to 20 percent slopes	7K	Well drained	D	Very limited	Very limited
Wodskow sandy loam	6K	Somewhat poorly drained	B	Very limited	Very limited
Alpowa loam, 3 to 12 percent slopes	6K	Well drained	A	Somewhat 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.

Aridisols

Dry-climate soils with low organic matter. Often have caliche layers that make excavation difficult. Low shrink-swell is good for foundations.

Mollisols

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

Entisols

Young soils with little development — found on floodplains, dunes, and steep slopes. Properties vary widely by setting.

What This Means

Building & Foundations

About 39% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.

Septic Systems

About 73% 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.