Winnebago County, IA Shrink-Swell Risk

What Winnebago County, IA's soil means for a foundation

Moderate

USDA's SSURGO data puts Winnebago County, IA's soil at "Moderate" shrink-swell potential, an area-weighted linear extensibility of 3.42% across 54.1% of the county's surveyed land. Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

This is a county figure, not a lot figure

USDA's survey covers the whole of Winnebago County, IA at once, not any single address. 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.

Report cost vs. repair cost

With Winnebago 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.

Winnebago County's rank among Iowa counties

Nationally, Winnebago County, IA is the 898-most-constrained of 3,085 rated counties for shrink-swell soil. Within Iowa alone it ranks 65 of 99. The county spans 400 square miles, home to 10,383 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Clinton County, KY and Madison County, TN 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 Shelby County, IA and Greene County, IA. The full underlying dataset is downloadable directly, one row per county.