Johnson County, Wyoming, Southern Part

Survey Area WY619• Wyoming

The dominant drainage class is Well drained and the dominant hydrologic group is D (very slow infiltration, high 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 Johnson County, Wyoming, Southern 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
Samday-Shingle-Badland complex, 10 to 45 percent slopes	78K	Well drained	D	Very limited	Very limited
Shingle-Tassel complex, 2 to 30 percent slopes	73K	Well drained	D	Very limited	Very limited
Shingle-Kishona-Samsil, dry complex, 3 to 30 percent slopes	54K	Well drained	D	Very limited	Very limited
Renohill-Razor-Samsil, dry complex, 6 to 20 percent slopes	46K	Well drained	D	Very limited	Very limited
Razor-Gaynor, dry-Samsil, dry complex, 6 to 30 percent slopes	41K	Well drained	D	Very limited	Very limited
Cambria-Cushman complex, 6 to 20 percent slopes	31K	Well drained	B	Somewhat limited	Somewhat limited
Parmleed-Renohill complex, 6 to 20 percent slopes	31K	Well drained	D	Very limited	Very limited
Parmleed-Lohsman-Cadoma complex, 6 to 10 percent slopes	28K	Well drained	D	Very limited	Very limited
Starley-Rock outcrop complex, steep	27K	Well drained	D	Very limited	Very limited
Spearfish-Shale outcrop complex, steep	25K	Well drained	D	Very limited	Very limited
Sunup-Carnero association	25K	Well drained	D	Very limited	Very limited
Badland	23K		D	Very limited	Very limited
Rock outcrop	23K		D	Not rated	Not rated
Sunup, cool moist-Rock outcrop complex, 20 to 40 percent slopes	22K	Well drained	D	Very limited	Very limited
Terro-Tassel-Shingle complex, 6 to 40 percent slopes	20K	Well drained	D	Very limited	Very limited
Shingle-Cushman complex, 10 to 30 percent slopes	17K	Well drained	D	Very limited	Very limited
Decross-Woosley association	16K	Well drained	C	Very limited	Very limited
Cloud Peak-Dell association	16K	Well drained	C	Very limited	Very limited
Shingle-Kishona-Zigweid loams, 6 to 30 percent slopes	15K	Well drained	B	Somewhat limited	Somewhat limited
Cushman-Parmleed-Renohill complex, 6 to 20 percent slopes	14K	Well drained	D	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.

Aridisols

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

Entisols

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

Alfisols

Moderately weathered forest soils with clay-enriched subsoil. Productive for agriculture, generally good for building and septic.

Mollisols

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

What This Means

Building & Foundations

About 88% 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 88% 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.