Corson County, SD Shrink-Swell Risk

Corson County's SSURGO shrink-swell reading

Moderate

In Corson County, SD, 43.7% of the surveyed soil carries a "Moderate" shrink-swell rating, 4.73% linear extensibility on average. That's a middle reading: not the sharp swings that crack a foundation outright, but enough that grading and drainage are worth getting right.

Before you rely on this for one address

Corson 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 Corson County will actually do.

Budgeting for Corson County, SD

Corson 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.

How Corson County, SD compares

Among the 3,085 rated counties on this site, Corson County, SD ranks 342 most-constrained nationally, and 22 of 66 within South Dakota. The county spans 2,470 square miles, home to 3,747 people.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Lamar County, MS and Toombs County, GA 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 Campbell County, SD and Gregory County, SD. The full underlying dataset is downloadable directly, one row per county.