Tripp County, SD Shrink-Swell Risk

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

High

USDA's SSURGO data puts Tripp County, SD's soil at "High" shrink-swell potential, an area-weighted linear extensibility of 6.54% across 40% of the county's surveyed land. This is enough movement to matter: a standard footing can hold up here, but usually only with real moisture management, not by default.

This is a county figure, not a lot figure

USDA's survey covers the whole of Tripp County, SD at once, not any single address. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Tripp County.

Report cost vs. repair cost

With Tripp County, SD rating "High", the gap between finding out early and finding out late is the whole decision. The report ($1,000-$5,000) is what tells you whether Tripp County's county-level reading applies to your lot; the repair ($5,000-$15,000) is what it costs if you skip that and find out from the cracks instead.

Where this sits nationally

Nationally, Tripp County, SD is the 88-most-constrained of 3,085 rated counties for shrink-swell soil. Within South Dakota alone it ranks 10 of 66. Tripp County covers 1,612 square miles and counts 5,717 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Atkinson County, GA and Angelina County, TX are worth a look for comparison.

How this reading is built, and its real limits · The warning signs of expansive-clay damage, explained

More of South Dakota

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