Harmon County, Oklahoma

Survey Area OK057• Oklahoma

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 Inceptisols — young soils with minimal horizon development but more than Entisols. 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 Harmon County, Oklahoma. 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
Tilvern clay loam, 1 to 3 percent slopes	22K	Well drained	D	Very limited	Very limited
Westill clay loam, 1 to 3 percent slopes	22K	Well drained	D	Very limited	Very limited
Woodward-Quinlan complex, 5 to 12 percent slopes	19K	Well drained	C	Somewhat limited	Very limited
Vernon-Knoco complex, cool, 1 to 12 percent slopes	18K	Well drained	D	Somewhat limited	Very limited
Grandfield loamy sand, 0 to 3 percent slopes	15K	Well drained	B	Not limited	Very limited
Aspermont silt loam, 1 to 3 percent slopes	14K	Well drained	B	Not limited	Somewhat limited
Knoco, Rock outcrop, and Cottonwood soils, 2 to 20 percent slopes	14K	Well drained	D	Very limited	Very limited
Knoco-Badland complex, dry, 1 to 12 percent slopes	11K	Well drained	D	Very limited	Very limited
Madge loam, 1 to 3 percent slopes	11K	Well drained	B	Not limited	Very limited
Springer and Devol loamy sands, 0 to 3 percent slopes	9K	Well drained	A	Not limited	Very limited
Tipton loam, 0 to 1 percent slopes	9K	Well drained	B	Somewhat limited	Somewhat limited
Woodward-Quinlan complex, 3 to 5 percent slopes	8K	Well drained	C	Somewhat limited	Very limited
Talpa-Aspermont-Rock outcrop complex, 1 to 8 percent slopes	8K	Well drained	D	Very limited	Very limited
Westill clay loam, 0 to 1 percent slopes	7K	Well drained	D	Very limited	Very limited
Devol and Springer loamy sands, 3 to 8 percent slopes	6K	Well drained	A	Not limited	Very limited
Quinlan-Rock outcrop complex, 12 to 45 percent slopes	6K	Well drained	D	Very limited	Very limited
Vernon clay loam, 3 to 5 percent slopes, eroded	6K	Well drained	D	Very limited	Very limited
Water	6K		D	Not rated	Not rated
La Casa silty clay loam, 1 to 3 percent slopes	5K	Well drained	C	Somewhat limited	Very limited
Hardeman-Southside-Arnett complex, 3 to 20 percent slopes	5K	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.

Inceptisols

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

Mollisols

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

Alfisols

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

Entisols

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

What This Means

Building & Foundations

About 43% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.

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.