Iroquois County, IL Shrink-Swell Risk

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

Moderate

Iroquois County, IL: USDA's soil survey rates 38.3% of the county "Moderate" for shrink-swell potential (4.71% linear extensibility). Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

What Iroquois County's reading doesn't cover

Two lots a mile apart in Iroquois County can carry different soil, even though they share one countywide reading. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Iroquois County will actually do.

What it costs to find out, versus to ignore it

With Iroquois 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.

Iroquois County's rank among Illinois counties

Nationally, Iroquois County, IL is the 346-most-constrained of 3,085 rated counties for shrink-swell soil. Within Illinois alone it ranks 6 of 101. The county spans 1,117 square miles, home to 26,067 people.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Randall County, TX and Montgomery County, AR 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 Knox County, IL and LaSalle County, IL. The full underlying dataset is downloadable directly, one row per county.