Adair County, MO Shrink-Swell Risk

Shrink-swell potential in Adair County, MO

Moderate

Soil across 56.1% of Adair County, MO comes back "Moderate" in USDA's shrink-swell data, averaging 5.08% 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 Adair County, MO - 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 Adair County.

Adair County: the real numbers

Adair 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, Adair County, MO ranks 279 most-constrained nationally, and 37 of 114 within Missouri. Adair County, MO is 567 square miles with a population of 25,660.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Gratiot County, MI and Jay County, IN 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 Missouri

Every county in Missouri is on this site, including Howard County, MO and Osage County, MO. The full underlying dataset is downloadable directly, one row per county.