Todd County, SD Shrink-Swell Risk

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

Low

Todd County, SD: USDA's soil survey rates 77.9% of the county "Low" for shrink-swell potential (2.23% linear extensibility). That's the easiest starting point on this site's scale - a standard foundation is the reasonable default here, though any one lot can still differ.

What Todd County's reading doesn't cover

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

What it costs to find out, versus to ignore it

With Todd County, SD rating "Low", 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.

How Todd County, SD compares

Nationally, Todd County, SD is the 1,777-most-constrained of 3,085 rated counties for shrink-swell soil. Within South Dakota alone it ranks 65 of 66. Todd County, SD is 1,389 square miles with a population of 9,172.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Lewis County, TN and Twin Falls County, ID 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 Clark County, SD and Harding County, SD. The full underlying dataset is downloadable directly, one row per county.