Johnson County, TN Shrink-Swell Risk

Johnson County's SSURGO shrink-swell reading

Low

In Johnson County, TN, 96.5% of the surveyed soil carries a "Low" shrink-swell rating, 1.2% linear extensibility on average. 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.

Before you rely on this for one address

Johnson County's reading is an average across the whole county, not a promise about any one lot inside it. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Budgeting for Johnson County, TN

Johnson County's soil reading points toward standard foundation practice as the likely outcome, not the exception. 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.

Where this sits nationally

Among the 3,085 rated counties on this site, Johnson County, TN ranks 2,768 most-constrained nationally, and 93 of 95 within Tennessee. Johnson County covers 298 square miles and counts 18,506 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Hamlin County, SD and Gloucester County, VA 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

Elsewhere in Tennessee

Every county in Tennessee is on this site, including Carroll County, TN and Weakley County, TN. The full underlying dataset is downloadable directly, one row per county.