Custer County, SD Shrink-Swell Risk

Custer County's SSURGO shrink-swell reading

Moderate

In Custer County, SD, 42.9% of the surveyed soil carries a "Moderate" shrink-swell rating, 4.44% linear extensibility on average. Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

Before you rely on this for one address

Custer 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 Custer County will actually do.

Budgeting for Custer County, SD

Custer County's soil reading points toward standard foundation practice as the likely outcome, not the exception. 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

Among the 3,085 rated counties on this site, Custer County, SD ranks 403 most-constrained nationally, and 27 of 66 within South Dakota. Custer County covers 1,557 square miles and counts 9,330 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Saratoga County, NY and Stark County, IL 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

Elsewhere in South Dakota

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