Johnson County, AR Shrink-Swell Risk

Johnson County, AR's soil, for shrink-swell risk

Low

Johnson County, AR: USDA's soil survey rates 89.7% of the county "Low" for shrink-swell potential (1.67% linear extensibility). That's the easiest starting point on this site's scale - a standard foundation is the reasonable default here, though any one lot can still differ.

What Johnson County's reading doesn't cover

Two lots a mile apart in Johnson County can carry different soil, even though they share one countywide reading. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Johnson County will actually do.

What it costs to find out, versus to ignore it

With Johnson County, AR rating "Low", a geotechnical report is still worthwhile before a build, just less urgent than in a high-risk county. A geotechnical report runs $1,000-$5,000, typically around $2,700. Foundation repair, if a specific lot turns out to differ from the county average, runs $5,000-$15,000.

How Johnson County, AR compares

Nationally, Johnson County, AR is the 2,314-most-constrained of 3,085 rated counties for shrink-swell soil. Within Arkansas alone it ranks 72 of 75. Johnson County covers 661 square miles and counts 26,172 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Orange County, CA and Fannin County, TX are worth a look for comparison.

How this reading is built, and its real limits · Moisture management: the cheap fix that works on any soil

More of Arkansas

Every county in Arkansas is on this site, including Lee County, AR and White County, AR. The full underlying dataset is downloadable directly, one row per county.