Wayne County, MO Shrink-Swell Risk
What Wayne County, MO's soil means for a foundation
Low
USDA's SSURGO data puts Wayne County, MO's soil at "Low" shrink-swell potential, an area-weighted linear extensibility of 1.4% across 95.9% of the county's surveyed land. 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.
This is a county figure, not a lot figure
USDA's survey covers the whole of Wayne County, MO at once, not any single address. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Wayne County will actually do.
Report cost vs. repair cost
With Wayne County, MO 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.
Wayne County's rank among Missouri counties
Nationally, Wayne County, MO is the 2,620-most-constrained of 3,085 rated counties for shrink-swell soil. Within Missouri alone it ranks 109 of 114. Wayne County, MO is 759 square miles with a population of 10,820.
See how another county compares
Orleans Parish, LA carries this site's most-constrained reading. Steuben County, NY and Pecos 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 Missouri
Every county in Missouri is on this site, including Worth County, MO and Platte County, MO. The full underlying dataset is downloadable directly, one row per county.