Winnebago County, IL Shrink-Swell Risk

Winnebago County's SSURGO shrink-swell reading

Moderate

In Winnebago County, IL, 66.8% of the surveyed soil carries a "Moderate" shrink-swell rating, 3.22% linear extensibility on average. That's a middle reading: not the sharp swings that crack a foundation outright, but enough that grading and drainage are worth getting right.

Before you rely on this for one address

Winnebago County's reading is an average across the whole county, not a promise about any one lot inside it. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Winnebago County will actually do.

Budgeting for Winnebago County, IL

Winnebago 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.

Winnebago County's rank among Illinois counties

Among the 3,085 rated counties on this site, Winnebago County, IL ranks 1,031 most-constrained nationally, and 82 of 101 within Illinois. Winnebago County covers 513 square miles and counts 283,790 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Jackson County, NC and Pike 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

Elsewhere in Illinois

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