Massac County, IL Shrink-Swell Risk

Shrink-swell potential in Massac County, IL

Low

Soil across 50.6% of Massac County, IL comes back "Low" in USDA's shrink-swell data, averaging 2.96% linear extensibility. That's the easiest starting point on this site's scale - a standard foundation is the reasonable default here, though any one lot can still differ.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Massac 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 Massac County.

Massac County: the real numbers

Massac 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.

Where this sits nationally

Among the 3,085 rated counties on this site, Massac County, IL ranks 1,226 most-constrained nationally, and 91 of 101 within Illinois. Massac County covers 237 square miles and counts 13,627 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. East Carroll Parish, LA and Orange County, VA 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 Edgar County, IL and Hancock County, IL. The full underlying dataset is downloadable directly, one row per county.