Sequoyah County, Oklahoma

Survey Area OK135• 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 Alfisols — moderately leached forest soils with a clay-enriched subsoil. 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 Sequoyah 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-Linker-Enders complex, 5 to 40 percent slopes, extremely stony	212K	Well drained	D	Very limited	Very limited
Linker-Hector complex, 3 to 5 percent slopes	36K	Well drained	D	Very limited	Very limited
Stigler silt loam, 1 to 3 percent slopes	31K	Moderately well drained	D	Very limited	Very limited
Water	26K		D	Not rated	Not rated
Guyton and Rexor soils, 0 to 1 percent slopes, frequently flooded	14K	Poorly drained	C/D	Very limited	Very limited
Linker and Stigler soils, 3 to 8 percent slopes, severely eroded	13K	Somewhat poorly drained	C	Very limited	Very limited
Stigler-Wrightsville silt loams complex, 0 to 1 percent slopes	11K	Moderately well drained	D	Very limited	Very limited
Shermore loam, 3 to 5 percent slopes, moderately eroded	9K	Somewhat poorly drained	D	Very limited	Very limited
Linker-Hector complex, 5 to 8 percent slopes	8K	Well drained	C	Very limited	Very limited
Shermore loam, 3 to 5 percent slopes	7K	Somewhat poorly drained	D	Very limited	Very limited
Guyton silt loam, 0 to 1 percent slopes, frequently flooded	6K	Poorly drained	C/D	Very limited	Very limited
Coushatta silt loam, 0 to 1 percent slopes, rarely flooded	6K	Well drained	B	Very limited	Somewhat limited
Mason silt loam, 0 to 1 percent slopes, rarely flooded	6K	Moderately well drained	C	Very limited	Very limited
Cupco silt loam, 0 to 1 percent slopes, occasionally flooded	6K	Very poorly drained	C/D	Very limited	Very limited
Oklared fine sandy loam, 0 to 3 percent slopes, occasionally flooded	5K	Well drained	A	Very limited	Very limited
Kiomatia loamy fine sand, 0 to 3 percent slopes, occasionally flooded	5K	Well drained	B	Very limited	Very limited
Shermore loam, 1 to 3 percent slopes	5K	Somewhat poorly drained	D	Very limited	Very limited
Spiro silt loam, 3 to 5 percent slopes	5K	Well drained	C	Very limited	Very limited
Vian silt loam, 1 to 3 percent slopes	4K	Somewhat poorly drained	C	Very limited	Very limited
Stigler silt loam, 0 to 1 percent slopes	3K	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.

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.

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.

Vertisols

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

What This Means

Building & Foundations

About 93% 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 92% 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.