Harding County, SD Shrink-Swell Risk

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

Moderate

Harding County, SD: USDA's soil survey rates 67.4% of the county "Moderate" for shrink-swell potential (3.03% linear extensibility). Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

What Harding County's reading doesn't cover

Two lots a mile apart in Harding County can carry different soil, even though they share one countywide reading. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

What it costs to find out, versus to ignore it

With Harding 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, Harding County, SD is the 1,184-most-constrained of 3,085 rated counties for shrink-swell soil. Within South Dakota alone it ranks 63 of 66. Harding County covers 2,672 square miles and counts 1,325 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Breckinridge County, KY and Teton County, MT 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 Marshall County, SD and Buffalo County, SD. The full underlying dataset is downloadable directly, one row per county.