Yankton County, SD Shrink-Swell Risk

Yankton County's SSURGO shrink-swell reading

Moderate

In Yankton County, SD, 50.7% of the surveyed soil carries a "Moderate" shrink-swell rating, 3.96% 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

Yankton 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 Yankton County will actually do.

Budgeting for Yankton County, SD

Yankton 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.

Yankton County's rank among South Dakota counties

Among the 3,085 rated counties on this site, Yankton County, SD ranks 591 most-constrained nationally, and 36 of 66 within South Dakota. Yankton County covers 521 square miles and counts 23,509 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Walker County, GA and Morrill County, NE 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 Mellette County, SD and Kingsbury County, SD. The full underlying dataset is downloadable directly, one row per county.