Carroll County, IL Shrink-Swell Risk

Carroll County, IL's soil, for shrink-swell risk

Moderate

Carroll County, IL: USDA's soil survey rates 70.6% of the county "Moderate" for shrink-swell potential (3.32% linear extensibility). Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

What Carroll County's reading doesn't cover

Two lots a mile apart in Carroll County can carry different soil, even though they share one countywide reading. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

What it costs to find out, versus to ignore it

With Carroll County, IL 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.

Where this sits nationally

Nationally, Carroll County, IL is the 963-most-constrained of 3,085 rated counties for shrink-swell soil. Within Illinois alone it ranks 79 of 101. Carroll County, IL is 445 square miles with a population of 15,444.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Champaign County, OH and Guadalupe County, TX 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 Illinois

Every county in Illinois is on this site, including Cook County, IL and Brown County, IL. The full underlying dataset is downloadable directly, one row per county.