Stanley County, SD Shrink-Swell Risk

Stanley County's SSURGO shrink-swell reading

Very High

In Stanley County, SD, 62.2% of the surveyed soil carries a "Very High" shrink-swell rating, 9.96% linear extensibility on average. Ground that moves this much routinely produces the classic expansive-soil symptoms: diagonal stair-step cracking, doors that stick seasonally, uneven floors. A standard footing is a poor bet here.

Before you rely on this for one address

Stanley County's reading is an average across the whole county, not a promise about any one lot inside it. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Budgeting for Stanley County, SD

Given Stanley County's rating, spending a few thousand now is the way to avoid spending tens of thousands later. A geotechnical report runs $1,000-$5,000 (typically $2,700); an actual foundation repair, once cracking sets in, typically runs $5,000-$15,000 (around $10,000 typical) - roughly 4x the report.

Where this sits nationally

Among the 3,085 rated counties on this site, Stanley County, SD ranks 30 most-constrained nationally, and 2 of 66 within South Dakota. Stanley County, SD is 1,444 square miles with a population of 3,015.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Howard County, IA and Okanogan County, WA are worth a look for comparison.

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

Elsewhere in South Dakota

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