Garvin County, Oklahoma

Survey Area OK049• Oklahoma

The dominant drainage class is Well drained and the dominant hydrologic group is C (slow infiltration, moderate 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 Garvin 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
Renfrow silt loam, 3 to 5 percent slopes, eroded	30K	Well drained	D	Somewhat limited	Very limited
Stephenville-Darnell complex, 5 to 20 percent slopes	21K	Well drained	C	Very limited	Very limited
Clarita clay, 5 to 12 percent slopes, moderately eroded	20K	Moderately well drained	C	Very limited	Very limited
Stephenville fine sandy loam, 3 to 5 percent slopes	19K	Well drained	C	Somewhat limited	Very limited
Zaneis loam, 3 to 5 percent slopes, moderately eroded	19K	Well drained	B	Somewhat limited	Somewhat limited
Clarita clay, 3 to 5 percent slopes, moderately eroded	16K	Moderately well drained	C	Very limited	Very limited
Grainola clay loam, 5 to 20 percent slopes	16K	Well drained	D	Very limited	Very limited
Stephenville and Newalla soils, 3 to 8 percent slopes, gullied	16K	Well drained	C	Somewhat limited	Very limited
Teller fine sandy loam, 3 to 5 percent slopes, eroded	16K	Well drained	B	Not limited	Very limited
Garvin silty clay loam, 0 to 1 percent slopes, occasionally flooded	14K	Moderately well drained	C	Very limited	Very limited
Stephenville fine sandy loam, 3 to 5 percent slopes, moderately eroded	14K	Well drained	C	Somewhat limited	Very limited
Port silt loam, 0 to 1 percent slopes, occasionally flooded	13K	Well drained	B	Very limited	Very limited
Keokuk silt loam, 0 to 1 percent slopes, rarely flooded	13K	Well drained	B	Very limited	Somewhat limited
Renfrow silt loam, 3 to 5 percent slopes, gullied	12K	Well drained	D	Very limited	Very limited
Chigley gravelly sandy loam, 1 to 5 percent slopes	12K	Moderately well drained	C	Somewhat limited	Very limited
Port and Pulaski soils, 0 to 1 percent slopes, frequently flooded	11K	Well drained	B	Very limited	Very limited
Yahola fine sandy loam, 0 to 1 percent slopes, occasionally flooded	11K	Well drained	A	Very limited	Very limited
Dale silt loam, 0 to 1 percent slopes, rarely flooded	10K	Well drained	B	Very limited	Somewhat limited
Newalla fine sandy loam, 1 to 5 percent slopes	9K	Moderately well drained	D	Very limited	Very limited
Chigley gravelly sandy loam, 5 to 12 percent slopes	8K	Moderately well drained	C	Somewhat 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.

Vertisols

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

What This Means

Building & Foundations

About 55% of soils are rated "very limited" for dwellings with basements. Specific challenges include shallow bedrock, steep slopes, flood-prone areas. A geotechnical assessment is recommended before building.

Septic Systems

About 85% 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.