Morgan County, IL Shrink-Swell Risk

Shrink-swell potential in Morgan County, IL

Moderate

Soil across 82.4% of Morgan County, IL comes back "Moderate" in USDA's shrink-swell data, averaging 3.91% 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 Morgan County, IL - never a reading for one specific parcel. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Morgan County.

Morgan County: the real numbers

Morgan 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.

Morgan County's rank among Illinois counties

Among the 3,085 rated counties on this site, Morgan County, IL ranks 623 most-constrained nationally, and 36 of 101 within Illinois. Morgan County, IL is 569 square miles with a population of 32,618.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Tyler County, WV and Sequatchie 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

Elsewhere in Illinois

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