Campbell County, TN Shrink-Swell Risk
Campbell County, TN's soil, for shrink-swell risk
Low
Campbell County, TN: USDA's soil survey rates 89.4% of the county "Low" for shrink-swell potential (2.13% 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 Campbell County's reading doesn't cover
Two lots a mile apart in Campbell County can carry different soil, even though they share one countywide reading. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).
What it costs to find out, versus to ignore it
With Campbell County, TN 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.
Where this sits nationally
Nationally, Campbell County, TN is the 1,861-most-constrained of 3,085 rated counties for shrink-swell soil. Within Tennessee alone it ranks 44 of 95. Campbell County covers 480 square miles and counts 40,238 residents.
Before you act on this
Orleans Parish, LA carries this site's most-constrained reading. Wright County, MO and Doddridge County, WV 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 Tennessee
Every county in Tennessee is on this site, including Claiborne County, TN and Henderson County, TN. The full underlying dataset is downloadable directly, one row per county.