Adair County, Oklahoma

Survey Area OK001• Oklahoma

The dominant drainage class is Somewhat excessively 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 Adair 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
Clarksville very gravelly silt loam, 20 to 50 percent slopes, stony	90K	Somewhat excessively drained	B	Very limited	Very limited
Enders-Linker-Hector association, 5 to 30 percent slopes	81K	Well drained	D	Very limited	Very limited
Clarksville very gravelly silt loam, 1 to 8 percent slopes	56K	Somewhat excessively drained	B	Not limited	Very limited
Tonti gravelly silt loam, 0 to 3 percent slopes	22K	Moderately well drained	C/D	Very limited	Very limited
Waben gravelly silt loam, 3 to 8 percent slopes	19K	Well drained	C	Not limited	Very limited
Clarksville stony silt loam, 5 to 15 percent slopes	16K	Somewhat excessively drained	B	Somewhat limited	Somewhat limited
Captina silt loam, 1 to 3 percent slopes	13K	Moderately well drained	C/D	Very limited	Very limited
Hector-Linker complex, 1 to 5 percent slopes	13K	Well drained	D	Very limited	Very limited
Elsah gravelly silt loam, 0 to 1 percent slopes, frequently flooded	12K	Well drained	B	Very limited	Very limited
Waben gravelly silt loam, 1 to 3 percent slopes	11K	Well drained	A	Not limited	Very limited
Britwater silt loam, 1 to 3 percent slopes	7K	Well drained	B	Not limited	Somewhat limited
Jay silt loam, 0 to 2 percent slopes	4K	Moderately well drained	C/D	Very limited	Very limited
Elsah gravelly loam, 0 to 1 percent slopes, occasionally flooded	3K	Well drained	B	Very limited	Very limited
Linker fine sandy loam, 3 to 5 percent slopes	3K	Well drained	C	Very limited	Very limited
Razort silt loam, 0 to 1 percent slopes, occasionally flooded	2K	Well drained	C	Very limited	Very limited
Stigler silt loam, 0 to 1 percent slopes	2K	Somewhat poorly drained	D	Very limited	Very limited
Sogn silty clay loam, 1 to 12 percent slopes	2K	Somewhat excessively drained	D	Very limited	Very limited
Britwater silt loam, 0 to 1 percent slopes	2K	Well drained	B	Not limited	Somewhat limited
Apperson silty clay loam, 1 to 3 percent slopes	2K	Somewhat poorly drained	D	Very limited	Very limited
Linker loam, 3 to 5 percent slopes	2K	Well drained	C	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.

Alfisols

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

Vertisols

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

Entisols

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

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.

What This Means

Building & Foundations

About 69% 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, sandy or gravelly soils with low bearing capacity. A geotechnical assessment is recommended before building.

Septic Systems

About 93% of soils are rated "very limited" for septic absorption fields. The well-drained soils may actually drain too fast for standard leach fields, allowing effluent to reach groundwater. Engineered or alternative systems are frequently required. Always get a professional perc test before purchasing land that needs septic.

Gardening & Agriculture

Soils tend to drain very quickly, meaning nutrients and water don't stick around long. Raised beds with amended soil, drip irrigation, and heavy mulching will give the best results. Compost is your best friend here — it improves water retention dramatically.