Okmulgee County, Oklahoma

Survey Area OK111• 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 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 Okmulgee 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
Hector-Endsaw complex, 5 to 30 percent slopes, stony	73K	Well drained	D	Very limited	Very limited
Collinsville-Talihina complex, 10 to 30 percent slopes	50K	Somewhat excessively drained	D	Very limited	Very limited
Dennis silt loam, 1 to 3 percent slopes	46K	Somewhat poorly drained	C/D	Very limited	Very limited
Taloka silt loam, 1 to 3 percent slopes	33K	Somewhat poorly drained	D	Very limited	Very limited
Bates-Collinsville complex, 1 to 5 percent slopes	30K	Well drained	C	Somewhat limited	Very limited
Eram-Verdigris complex, 0 to 20 percent slopes	27K	Moderately well drained	D	Very limited	Very limited
Verdigris-Madill complex, 0 to 1 percent slopes, frequently flooded	19K	Well drained	B	Very limited	Very limited
Verdigris silt loam, 0 to 1 percent slopes, occasionally flooded	17K	Well drained	B	Very limited	Very limited
Hector-Clearview complex, 1 to 5 percent slopes	17K	Well drained	D	Very limited	Very limited
Verdigris silt loam, 0 to 1 percent slopes, frequently flooded	13K	Well drained	B	Very limited	Very limited
Okemah silt loam, 1 to 3 percent slopes	11K	Somewhat poorly drained	C/D	Very limited	Very limited
Dennis silt loam, 3 to 5 percent slopes	11K	Somewhat poorly drained	C/D	Very limited	Very limited
Okemah silt loam, 0 to 1 percent slopes	10K	Somewhat poorly drained	C/D	Very limited	Very limited
Dennis silt loam, 3 to 5 percent slopes, eroded	9K	Somewhat poorly drained	C/D	Very limited	Very limited
Parsons silt loam, 0 to 1 percent slopes	9K	Somewhat poorly drained	D	Very limited	Very limited
Lightning silt loam, 0 to 1 percent slopes, occasionally flooded	7K	Poorly drained	D	Very limited	Very limited
Okemah-Eram complex, 1 to 3 percent slopes	6K	Somewhat poorly drained	C/D	Very limited	Very limited
Karma loamy fine sand, 3 to 8 percent slopes	6K	Well drained	B	Not limited	Very limited
Bates loam, 1 to 3 percent slopes	5K	Well drained	C	Somewhat limited	Very limited
Parsons silt loam, 1 to 3 percent slopes	5K	Somewhat 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.

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.

Inceptisols

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

What This Means

Building & Foundations

About 89% 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 100% 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.