Delaware County, Oklahoma

Survey Area OK041• Oklahoma

The dominant drainage class is Somewhat excessively drained and the dominant hydrologic group is B (moderate infiltration). The most common soil order is Mollisols — grassland soils with a thick, dark, fertile topsoil rich in organic matter. 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 Delaware 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	115K	Somewhat excessively drained	B	Very limited	Very limited
Clarksville very gravelly silt loam, 1 to 8 percent slopes	63K	Somewhat excessively drained	B	Not limited	Very limited
Clarksville very gravelly silt loam, 5 to 20 percent slopes, stony	54K	Somewhat excessively drained	B	Somewhat limited	Somewhat limited
Razort gravelly loam, 0 to 3 percent slopes, occasionally flooded	39K	Well drained	B	Very limited	Very limited
Water	36K	Subaqueous		Not rated	Not rated
Doniphan gravelly silt loam, 1 to 3 percent slopes	26K	Well drained	B	Not limited	Somewhat limited
Britwater gravelly silt loam, 3 to 8 percent slopes	17K	Well drained	B	Not limited	Somewhat limited
Doniphan-Tonti complex, 3 to 5 percent slopes	17K	Well drained	B	Not limited	Somewhat limited
Macedonia silt loam, 1 to 3 percent slopes	15K	Well drained	B	Not limited	Somewhat limited
Captina silt loam, 1 to 3 percent slopes	15K	Moderately well drained	C/D	Very limited	Very limited
Eldorado silt loam, 1 to 3 percent slopes	13K	Well drained	B	Not limited	Somewhat limited
Eldorado stony silt loam, 3 to 12 percent slopes	9K	Well drained	C	Not limited	Very limited
Tonti gravelly silt loam, 1 to 3 percent slopes	9K	Moderately well drained	D	Very limited	Very limited
Dennis silt loam, 1 to 3 percent slopes	9K	Somewhat poorly drained	C/D	Very limited	Very limited
Britwater silt loam, 1 to 3 percent slopes	7K	Well drained	B	Not limited	Somewhat limited
Eldorado silt loam, 3 to 5 percent slopes	7K	Well drained	C	Somewhat limited	Very limited
Taloka silt loam, 0 to 1 percent slopes	6K	Somewhat poorly drained	D	Very limited	Very limited
Stigler silt loam, 0 to 1 percent slopes	6K	Somewhat poorly drained	D	Very limited	Very limited
Jay silt loam, 1 to 3 percent slopes	5K	Moderately well drained	C	Very limited	Very limited
Mayes silt loam, 0 to 1 percent slopes	5K	Poorly 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.

Mollisols

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

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.

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 44% of soils have significant building limitations, while the rest are generally suitable. Check specific sites carefully — conditions vary across the area.

Septic Systems

About 60% 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.