Grainger County, TN Shrink-Swell Risk

Shrink-swell potential in Grainger County, TN

Moderate

Soil across 51.2% of Grainger County, TN comes back "Moderate" in USDA's shrink-swell data, averaging 3% linear extensibility. A real but modest amount of movement - standard foundations usually hold up, but drainage and moisture control around the foundation still matter more than on low-risk soil.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Grainger County, TN - never a reading for one specific parcel. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Grainger County will actually do.

Grainger County: the real numbers

Grainger 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, Grainger County, TN ranks 1,197 most-constrained nationally, and 15 of 95 within Tennessee. Grainger County covers 281 square miles and counts 25,073 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Hardee County, FL and Grady County, OK 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 Rhea County, TN and Sevier County, TN. The full underlying dataset is downloadable directly, one row per county.