McCurtain County, Oklahoma

Survey Area OK089• Oklahoma

The dominant drainage class is Well drained and the dominant hydrologic group is B (moderate infiltration). The most common soil order is Ultisols — strongly weathered soils with clay-enriched subsoils, common in warm humid climates. 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 McCurtain 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
Clebit-Carnasaw-Stapp association, 12 to 20 percent slopes	240K	Well drained	B	Very limited	Very limited
Clebit-Carnasaw-Stapp association, 20 to 40 percent slopes	159K	Well drained	C	Very limited	Very limited
Carnasaw-Clebit association, 12 to 20 percent slopes	83K	Well drained	C	Very limited	Very limited
Felker loam, 0 to 2 percent slopes	51K	Somewhat poorly drained	C	Very limited	Very limited
Ruston fine sandy loam, 3 to 8 percent slopes	47K	Well drained	B	Not limited	Somewhat limited
Sherwood-Zafra complex, 5 to 12 percent slopes	38K	Well drained	B	Somewhat limited	Somewhat limited
Water	34K		D	Not rated	Not rated
Guyton silt loam, 0 to 1 percent slopes, frequently flooded	30K	Poorly drained	C/D	Very limited	Very limited
Pickens gravelly silt loam, 5 to 15 percent slopes	27K	Somewhat excessively drained	D	Very limited	Very limited
Swink-Hollywood complex, 5 to 20 percent slopes	26K	Well drained	D	Very limited	Very limited
Carnasaw-Zafra complex, 1 to 8 percent slopes	21K	Well drained	C	Very limited	Very limited
Saffell gravelly fine sandy loam, 5 to 12 percent slopes	21K	Well drained	B	Somewhat limited	Very limited
Blevins fine sandy loam, 1 to 3 percent slopes	21K	Well drained	B	Not limited	Somewhat limited
Clebit-Rock outcrop complex, 35 to 60 percent slopes	19K	Well drained	D	Very limited	Very limited
Guyton-Elysian complex, 0 to 3 percent slopes	19K	Poorly drained	C	Very limited	Very limited
Kullit fine sandy loam, 1 to 3 percent slopes	19K	Moderately well drained	C	Very limited	Very limited
Boggy-Pushmataha complex, 0 to 1 percent slopes, frequently flooded	19K	Somewhat poorly drained	B/D	Very limited	Very limited
Tinn-Roebuck complex, 0 to 1 percent slopes, occasionally flooded	18K	Moderately well drained	D	Very limited	Very limited
Ceda gravelly fine sandy loam, 0 to 2 percent slopes, frequently flooded	18K	Well drained	A	Very limited	Very limited
Tiak-Ruston complex, 5 to 15 percent slopes	15K	Moderately 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.

Ultisols

Strongly weathered clay soils of the Southeast. Acidic and naturally low in nutrients. Clay subsoil can slow drainage.

Vertisols

High-clay soils that shrink and swell dramatically. Fertile but challenging for foundations and septic systems.

Alfisols

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

Inceptisols

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

Entisols

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

What This Means

Building & Foundations

About 82% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, poor drainage in some areas, flood-prone areas. A geotechnical assessment is recommended before building.

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

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.