Washita County, Oklahoma

Survey Area OK149• Oklahoma

The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate 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 Washita 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
St. Paul silt loam, 1 to 3 percent slopes	86K	Well drained	C	Somewhat limited	Very limited
Cordell-Rock outcrop complex, 1 to 20 percent slopes	38K	Somewhat excessively drained	D	Very limited	Very limited
Carey silt loam, 3 to 5 percent slopes	37K	Well drained	B	Somewhat limited	Somewhat limited
Carey silt loam, 1 to 3 percent slopes	36K	Well drained	B	Not limited	Somewhat limited
Grandfield fine sandy loam, 1 to 3 percent slopes	34K	Well drained	B	Not limited	Very limited
Obaro silty clay loam, 3 to 5 percent slopes, eroded	28K	Well drained	C	Somewhat limited	Very limited
Clairemont silt loam, 0 to 1 percent slopes, occasionally flooded, cool	27K	Well drained	B	Very limited	Very limited
Woodward-Quinlan complex, 3 to 5 percent slopes	26K	Well drained	C	Somewhat limited	Very limited
Cordell silty clay loam, 1 to 5 percent slopes, eroded	22K	Somewhat excessively drained	D	Very limited	Very limited
Obaro silty clay loam, 3 to 5 percent slopes	17K	Well drained	C	Somewhat limited	Very limited
Quinlan-Woodward complex, 5 to 12 percent slopes	17K	Well drained	D	Very limited	Very limited
Dill-Pixlee complex, 1 to 3 percent slopes	15K	Well drained	B	Somewhat limited	Very limited
St. Paul silt loam, 0 to 1 percent slopes	14K	Well drained	C	Somewhat limited	Very limited
Dill-Pixlee complex, 3 to 5 percent slopes	14K	Well drained	B	Somewhat limited	Very limited
Quinlan-Obaro complex, 5 to 12 percent slopes	13K	Well drained	D	Very limited	Very limited
Grandfield fine sandy loam, 3 to 5 percent slopes	13K	Well drained	B	Not limited	Very limited
Port silt loam, 0 to 1 percent slopes, occasionally flooded	11K	Well drained	B	Very limited	Very limited
Quinlan-Woodward complex, 3 to 5 percent slopes, eroded	11K	Well drained	D	Very limited	Very limited
Obaro silty clay loam, 1 to 3 percent slopes	10K	Well drained	C	Somewhat limited	Very limited
Woodward-Clairemont complex, 0 to 12 percent slopes	10K	Well drained	C	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.

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.

Entisols

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

What This Means

Building & Foundations

About 28% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.

Septic Systems

About 84% 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

Drainage is generally favorable for gardening. Adding compost and mulch will improve fertility and water retention. Test your soil's pH before planting — most vegetables prefer 6.0-7.0.