Soil series profile

Harrah soil series

Harrah is a well drained soil with a fine sandy loam surface, mapped on 166,215 acres in 21 counties across 2 states. Hydrologic group B.

#2202 by mapped area fine-loamy Ultic Paleustalfs (Alfisols)

Drainage class: Well drained
Hydrologic group: B
Typical topsoil pH: 5.9
Mapped area: 166k

Typical Harrah 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 Harrah horizons (representative values)
Depth	Texture	pH	Clay	Sand	Organic matter
0–5 in (A)	Fine sandy loam	5.9	14%	66%	2.25%
5–9 in (E)	Fine sandy loam	5.9	11%	63%	1%
9–70 in (Bt1)	Sandy clay loam	5.9	26%	56%	0.5%
70–80 in (Bt2)	Fine sandy loam	5.9	18%	64%	0.25%

Representative values from the most extensive Harrah map unit (Harrah fine sandy loam, 3 to 5 percent slopes, survey area OK109). 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 Harrah soil means for gardens, lawns and septic systems

For gardens

Typical topsoil in Harrah soils is moderately acidic: pH 5.9 (most land between 5.9 and 7.0). Many vegetables grow well here, and some gardens benefit from a little lime. Test before adding any.

Loamy topsoil (loam, silt loam and similar) covers 67% of mapped Harrah acres: generally the easiest soil to garden, holding moisture without staying waterlogged. The most common surface texture is fine sandy loam (67% of mapped Harrah acres).

100% of mapped Harrah 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 47% of the acres in mapped Harrah soils very limited, 20% somewhat limited and 0% not limited (33% not rated, such as urban land, pits or water).

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 Harrah soil is found

Mapped acres

Harrah is mapped in Oklahoma and Kansas.

Counties with the most mapped Harrah soil
County	Acres	Share of county land
Oklahoma County, OK	50,088	11.1%
Cleveland County, OK	48,284	14.1%
Logan County, OK	19,763	4.2%
Lincoln County, OK	15,688	2.6%
Seminole County, OK	6,536	1.6%
Payne County, OK	6,369	1.5%
Stephens County, OK	5,238	0.9%
Pottawatomie County, OK	4,236	0.8%
Okfuskee County, OK	2,210	0.6%
Pawnee County, OK	1,348	0.4%
Noble County, OK	1,277	0.3%
Osage County, OK	1,208	0.1%
Grady County, OK	975	0.1%
Jefferson County, OK	699	0.1%
Garvin County, OK	398	0.1%
Pontotoc County, OK	386	0.1%
McClain County, OK	362	0.1%
Johnston County, OK	355	0.1%
Creek County, OK	333	0.1%
Chautauqua County, KS	241	0.1%
Comanche County, OK	221	0.0%

Septic absorption fields

NRCS rating, share of Harrah acres

Not limited 0%

Somewhat limited 20%

Very limited 47%

Not rated 33%

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

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Septic tank absorption field rating across mapped Harrah acres.
Category	Share of acres
Not limited	0.0%
Somewhat limited	20.2%
Very limited	46.7%
Not rated	33.1%

Drainage, water table and flooding

Share of Harrah acres

Depth to seasonal high water table: None reported within about 6.5 feet (median where reported).
Flooding: Not mapped as flooding on most acres.
Slope: Typically 3–9% (median 6%).
Topsoil organic matter: Median 2.2%.

Drainage class

Excessively drained 0%

Somewhat excessively drained 0%

Well drained 100%

Moderately well drained 0%

Somewhat poorly drained 0%

Poorly drained 0%

Very poorly drained 0%

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

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Drainage class across mapped Harrah acres.
Category	Share of acres
Excessively drained	0.0%
Somewhat excessively drained	0.0%
Well drained	100.0%
Moderately well drained	0.0%
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 98%

C: slow infiltration 0%

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%

Not rated 2%

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

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Hydrologic soil group across mapped Harrah acres.
Category	Share of acres
A: fast infiltration (mostly sandy or gravelly)	0.0%
B: moderate infiltration	98.3%
C: slow infiltration	0.0%
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%
Not rated	1.7%

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 Harrah (component kind "Series") in SSURGO: 166,215 acres.
Method: Shares are by mapped acres of Harrah components. The profile comes from the single largest Harrah component. Full methodology.

Independent reference site. No government affiliation or endorsement.

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