Crawford County, IL Shrink-Swell Risk

Shrink-swell potential in Crawford County, IL

Moderate

Soil across 62.6% of Crawford County, IL comes back "Moderate" in USDA's shrink-swell data, averaging 3.38% linear extensibility. A real but modest amount of movement - standard foundations usually hold up, but drainage and moisture control around the foundation still matter more than on low-risk soil.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Crawford County, IL - never a reading for one specific parcel. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Crawford County will actually do.

Crawford County: the real numbers

Crawford 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.

Crawford County's rank among Illinois counties

Among the 3,085 rated counties on this site, Crawford County, IL ranks 921 most-constrained nationally, and 76 of 101 within Illinois. Crawford County, IL is 444 square miles with a population of 18,388.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Dawes County, NE and Smith County, MS 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 Stephenson County, IL and Knox County, IL. The full underlying dataset is downloadable directly, one row per county.