Bon Homme County, SD Shrink-Swell Risk

Shrink-swell potential in Bon Homme County, SD

Moderate

Soil across 58.1% of Bon Homme County, SD comes back "Moderate" in USDA's shrink-swell data, averaging 3.74% linear extensibility. A real but modest amount of movement - standard foundations usually hold up, but drainage and moisture control around the foundation still matter more than on low-risk soil.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Bon Homme County, SD - never a reading for one specific parcel. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Bon Homme County: the real numbers

Bon Homme County's soil reading points toward standard foundation practice as the likely outcome, not the exception. 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 Bon Homme County, SD compares

Among the 3,085 rated counties on this site, Bon Homme County, SD ranks 707 most-constrained nationally, and 43 of 66 within South Dakota. The county spans 564 square miles, home to 7,071 people.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Chickasaw County, MS and Richmond County, NC 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

Elsewhere in South Dakota

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