Soil series profile

Radley soil series

Radley is a moderately well drained soil with a silt loam surface, mapped on 108,680 acres in 11 counties across 3 states. Hydrologic group B.

#3284 by mapped area fine-silty Fluventic Hapludolls (Mollisols)

Drainage class: Moderately well drained
Hydrologic group: B
Typical topsoil pH: 6.5
Mapped area: 109k

Typical Radley profile

Texture and pH by depth

Depth to scale. More strongly shaded layers hold more clay. Horizon names are the soil survey's (A = topsoil, B = subsoil, C = parent material).

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Typical Radley horizons (representative values)
Depth	Texture	pH	Clay	Sand	Organic matter
0–16 in (Ap)	Silt loam	6.5	21%	11%	2%
16–41 in (Bw)	Silty clay loam	6.5	30%	9%	0.5%
41–79 in (C)	Silty clay loam	6.5	30%	10%	0.5%

Representative values from the most extensive Radley map unit (Radley silt loam, 0 to 1 percent slopes, frequently flooded, survey area OK105). Other map units of this series vary within the series range.

Stock photo for illustration, not a sample of this soil series. Credit on the Sources & method page.

What this means

What Radley soil means for gardens, lawns and septic systems

For gardens

Typical topsoil in Radley soils is slightly acidic: pH 6.5, the range most vegetables, flowers and lawn grasses prefer.

Loamy topsoil (loam, silt loam and similar) covers 100% of mapped Radley acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is silt loam (92% of mapped Radley acres).

100% of mapped Radley acres is moderately well to excessively drained, which suits most garden plants.

For lawns and yards

Most land is in hydrologic groups B and C, where rain soaks in at a moderate pace.

For a septic system

For conventional septic absorption fields, NRCS rates 100% of the acres in mapped Radley soils very limited, 0% somewhat limited and 0% not limited.

Where the soil is very limited (slow permeability, a high water table, flooding, shallow bedrock or steep slopes), alternative systems such as mound or sand-filter designs are common and cost more.

Flooding is mapped on 100% of the acres (46% occasional, 55% frequent).

Only a licensed site evaluation or perc test at the actual lot decides whether a system is allowed and which design.

Generated from the mapped numbers above using fixed rules, not a site visit. See how these notes are written.

Where Radley soil is found

Mapped acres

Radley is mapped in Oklahoma, Missouri and Kansas.

Counties with the most mapped Radley soil
County	Acres	Share of county land
Tulsa County, OK	23,330	6.4%
Nowata County, OK	22,329	6.2%
Wagoner County, OK	22,037	6.2%
Vernon County, MO	12,171	2.3%
Barton County, MO	9,938	2.6%
Craig County, OK	9,123	1.9%
Crawford County, KS	7,601	2.0%
Okfuskee County, OK	2,093	0.5%
Rogers County, OK	54	0.0%
St. Clair County, MO	4	0.0%
Osage County, OK	0	0.0%

Septic absorption fields

NRCS rating, share of Radley acres

Not limited 0%

Somewhat limited 0%

Very limited 100%

Septic tank absorption field rating across mapped Radley acres. Scale 0 to 100% of mapped land.

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Septic tank absorption field rating across mapped Radley acres.
Category	Share of acres
Not limited	0.0%
Somewhat limited	0.0%
Very limited	100.0%

Drainage, water table and flooding

Share of Radley acres

Depth to seasonal high water table: None reported within about 6.5 feet (median where reported).
Flooding: Mapped as flooding on 100% of acres (46% occasional, 55% frequent).
Slope: Typically 1–2% (median 1%).
Topsoil organic matter: Median 2%.

Drainage class

Excessively drained 0%

Somewhat excessively drained 0%

Well drained 0%

Moderately well drained 100%

Somewhat poorly drained 0%

Poorly drained 0%

Very poorly drained 0%

Drainage class across mapped Radley acres. Scale 0 to 100% of mapped land.

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Drainage class across mapped Radley acres.
Category	Share of acres
Excessively drained	0.0%
Somewhat excessively drained	0.0%
Well drained	0.0%
Moderately well drained	100.0%
Somewhat poorly drained	0.0%
Poorly drained	0.0%
Very poorly drained	0.0%

Hydrologic soil group

A: fast infiltration (mostly sandy or gravelly) 0%

B: moderate infiltration 92%

C: slow infiltration 8%

D: very slow infiltration (clayey, shallow or wet) 0%

A/D: D as is, A if drained 0%

B/D: D as is, B if drained 0%

C/D: D as is, C if drained 0%

Hydrologic soil group across mapped Radley acres. Scale 0 to 100% of mapped land.

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Hydrologic soil group across mapped Radley acres.
Category	Share of acres
A: fast infiltration (mostly sandy or gravelly)	0.0%
B: moderate infiltration	91.7%
C: slow infiltration	8.3%
D: very slow infiltration (clayey, shallow or wet)	0.0%
A/D: D as is, A if drained	0.0%
B/D: D as is, B if drained	0.0%
C/D: D as is, C if drained	0.0%

Sources & data dates

Source: USDA NRCS Soil Survey Geographic Database (SSURGO), queried through Soil Data Access. Public domain.
Data date: SSURGO as published on November 3, 2026 (most recent survey area update October 26, 2026). NRCS refreshes SSURGO each October.
Scope: All map unit components named Radley (component kind "Series") in SSURGO: 108,680 acres.
Method: Shares are by mapped acres of Radley components. The profile comes from the single largest Radley component. Full methodology.

Independent reference site. No government affiliation or endorsement.

Full narrative description: USDA Official Soil Series Description for Radley.