McCurtain County Soil Data
McCurtain County, Oklahoma
Avg pH
5.5
Texture
Water
Drainage
N/A
Organic Matter
1.4%
Hydrologic Group
D
Data Story
About Soil in McCurtain County, Oklahoma
The Acidic Soils of the Southeast
McCurtain County's soil is notably acidic, with an average pH of 5.47, well below the state average of 6.06. This acidity is a hallmark of the southeastern Oklahoma landscape, where high rainfall leaches away alkaline minerals. It creates a specific niche that is perfect for timber and acid-loving flora.
A Gritty Clay Mix
The soil features 40.7% sand and 20.4% clay, balanced by 31.1% silt. This composition provides a firm structure that can hold nutrients well, though the acidity can sometimes limit their uptake. The sand content helps with initial water penetration, but the clay ensures it doesn't drain away too fast.
Average Water, Low Organic Matter
Organic matter levels sit at 1.39%, trailing the state average of 1.72%. However, the available water capacity of 0.144 in/in perfectly matches the Oklahoma state average. This means that despite lower organic levels, the soil remains a dependable source of moisture for forest and field.
Tight Soils and Runoff Concerns
Classified under Hydrologic Group D, the soil in McCurtain County is characterized by high runoff potential and slow internal drainage. In this high-rainfall region, this can lead to frequent saturated conditions in low-lying areas. Proper drainage planning is essential for any construction or intensive gardening project.
Timber and Berries in Zone 8a
The warm, humid climate of zone 8a combined with acidic soil makes McCurtain County the premier spot for Loblolly pines and blackberries. It is also an excellent environment for southern ornamentals like camellias. Plant an acid-loving garden today to embrace the unique character of the Oklahoma southeast.
Soil Composition
Soil pH
Soil Series
Detailed soil series data not yet available for this county.
Hydrologic Group
Group D — High Runoff
Clay soils with very slow infiltration rates. Highest runoff potential. These soils have a permanent high water table or are shallow over impervious material.
Drainage Class
Drainage class data not available.
Soil Profile
Dominant texture: Water
Typical soil profile. Actual depths vary by location.
USDA Soil Orders
Frequently Asked Questions
What type of soil does McCurtain County have?
McCurtain County's soil is classified as Water. This indicates the relative proportions of sand, silt, and clay — 41% sand, 31% silt, and 20% clay. Sandy soils drain quickly but may need more frequent irrigation and fertilization.
Is McCurtain County's soil acidic or alkaline?
McCurtain County's soil has a low pH of 5.5, which is strongly acidic. Acidic soils benefit from lime applications to raise pH and improve nutrient availability.
What is the drainage class for McCurtain County?
Drainage class data is not currently available for McCurtain County.
What crops or plants grow well in McCurtain County's soil?
Based on McCurtain County's Water texture, pH of 5.5, and drainage class, the soil is well suited for acid-loving plants like blueberries and azaleas.
What USDA soil order is found in McCurtain County?
The dominant USDA soil order for McCurtain County is not currently available in our dataset.
Planning your lawn? View lawn care data for McCurtain County on LawnByCounty.com →
Other Counties in Oklahoma
Soil data sourced from USDA SSURGO via Soil Data Access. Data is informational only and should not be used as a substitute for on-site soil testing. Contact your local NRCS office for site-specific soil information.