Codington County, SD Shrink-Swell Risk

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

Moderate

Codington County, SD: USDA's soil survey rates 80.5% of the county "Moderate" for shrink-swell potential (3.47% linear extensibility). A real but modest amount of movement - standard foundations usually hold up, but drainage and moisture control around the foundation still matter more than on low-risk soil.

What Codington County's reading doesn't cover

Two lots a mile apart in Codington 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 Codington County will actually do.

What it costs to find out, versus to ignore it

With Codington 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.

Codington County's rank among South Dakota counties

Nationally, Codington County, SD is the 862-most-constrained of 3,085 rated counties for shrink-swell soil. Within South Dakota alone it ranks 59 of 66. Codington County, SD is 688 square miles with a population of 29,278.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Blanco County, TX and Burlington County, NJ 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 Yankton County, SD and Day County, SD. The full underlying dataset is downloadable directly, one row per county.