Douglas County, SD Shrink-Swell Risk

Douglas County, SD's soil, for shrink-swell risk

Moderate

Douglas County, SD: USDA's soil survey rates 69% of the county "Moderate" for shrink-swell potential (3.83% linear extensibility). Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

What Douglas County's reading doesn't cover

Two lots a mile apart in Douglas County can carry different soil, even though they share one countywide reading. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Douglas County will actually do.

What it costs to find out, versus to ignore it

With Douglas County, SD 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 Douglas County, SD compares

Nationally, Douglas County, SD is the 664-most-constrained of 3,085 rated counties for shrink-swell soil. Within South Dakota alone it ranks 40 of 66. Douglas County covers 432 square miles and counts 2,849 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Harrison County, IN and Marshall County, AL 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 South Dakota

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