Calhoun County, IA Shrink-Swell Risk

Calhoun County, IA's soil, for shrink-swell risk

Moderate

Calhoun County, IA: USDA's soil survey rates 53.1% of the county "Moderate" for shrink-swell potential (3.42% linear extensibility). That's a middle reading: not the sharp swings that crack a foundation outright, but enough that grading and drainage are worth getting right.

What Calhoun County's reading doesn't cover

Two lots a mile apart in Calhoun County can carry different soil, even though they share one countywide reading. 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 Calhoun County.

What it costs to find out, versus to ignore it

With Calhoun County, IA 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.

How Calhoun County, IA compares

Nationally, Calhoun County, IA is the 899-most-constrained of 3,085 rated counties for shrink-swell soil. Within Iowa alone it ranks 66 of 99. The county spans 570 square miles, home to 9,711 people.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Becker County, MN and Roberts County, SD 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 Iowa

Every county in Iowa is on this site, including Buena Vista County, IA and Winnebago County, IA. The full underlying dataset is downloadable directly, one row per county.