Ralls County, MO Shrink-Swell Risk

What Ralls County, MO's soil means for a foundation

Moderate

USDA's SSURGO data puts Ralls County, MO's soil at "Moderate" shrink-swell potential, an area-weighted linear extensibility of 4.93% across 42.5% of the county's surveyed land. Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

This is a county figure, not a lot figure

USDA's survey covers the whole of Ralls County, MO at once, not any single address. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Ralls County.

Report cost vs. repair cost

With Ralls County, MO rating "Moderate", 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.

How Ralls County, MO compares

Nationally, Ralls County, MO is the 302-most-constrained of 3,085 rated counties for shrink-swell soil. Within Missouri alone it ranks 41 of 114. Ralls County, MO is 470 square miles with a population of 10,499.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Monona County, IA and Monroe County, NY 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 New Madrid County, MO and Mississippi County, MO. The full underlying dataset is downloadable directly, one row per county.