Spink County, SD Shrink-Swell Risk

What Spink County, SD's soil means for a foundation

Moderate

USDA's SSURGO data puts Spink County, SD's soil at "Moderate" shrink-swell potential, an area-weighted linear extensibility of 4.27% across 61.6% of the county's surveyed land. That's a middle reading: not the sharp swings that crack a foundation outright, but enough that grading and drainage are worth getting right.

This is a county figure, not a lot figure

USDA's survey covers the whole of Spink County, SD at once, not any single address. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Report cost vs. repair cost

With Spink 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.

Where this sits nationally

Nationally, Spink County, SD is the 452-most-constrained of 3,085 rated counties for shrink-swell soil. Within South Dakota alone it ranks 29 of 66. Spink County, SD is 1,503 square miles with a population of 6,108.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Montgomery County, VA and Deuel 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

More of South Dakota

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