Dewey County, SD Shrink-Swell Risk

Dewey County's SSURGO shrink-swell reading

High

In Dewey County, SD, 64.1% of the surveyed soil carries a "High" shrink-swell rating, 8.68% linear extensibility on average. Ground like this needs active moisture control to keep a conventional foundation from cracking - it's not automatic either way.

Before you rely on this for one address

Dewey County's reading is an average across the whole county, not a promise about any one lot inside it. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Dewey County will actually do.

Budgeting for Dewey County, SD

With Dewey County, SD rating "High", the gap between finding out early and finding out late is the whole decision. A geotechnical report runs $1,000-$5,000 (typically $2,700); an actual foundation repair, once cracking sets in, typically runs $5,000-$15,000 (around $10,000 typical) - roughly 4x the report.

Where this sits nationally

Among the 3,085 rated counties on this site, Dewey County, SD ranks 49 most-constrained nationally, and 5 of 66 within South Dakota. Dewey County covers 2,302 square miles and counts 5,322 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Edgefield County, SC and Cooke County, TX are worth a look for comparison.

How this reading is built, and its real limits · The warning signs of expansive-clay damage, explained

Elsewhere in South Dakota

Every county in South Dakota is on this site, including Corson County, SD and Roberts County, SD. The full underlying dataset is downloadable directly, one row per county.