McNairy County, TN Shrink-Swell Risk

Shrink-swell potential in McNairy County, TN

Low

Soil across 83.3% of McNairy County, TN comes back "Low" in USDA's shrink-swell data, averaging 1.71% linear extensibility. That's as favorable a county-level reading as this dataset produces - standard foundation practice, pending one lot's own geotechnical report.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in McNairy 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 McNairy County will actually do.

McNairy County: the real numbers

McNairy 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.

How McNairy County, TN compares

Among the 3,085 rated counties on this site, McNairy County, TN ranks 2,269 most-constrained nationally, and 62 of 95 within Tennessee. McNairy County covers 563 square miles and counts 26,103 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Lander County, NV and Franklin County, KS 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 Overton County, TN and Bedford County, TN. The full underlying dataset is downloadable directly, one row per county.