Dunklin County, MO Shrink-Swell Risk

Shrink-swell potential in Dunklin County, MO

Moderate

Soil across 52.5% of Dunklin County, MO comes back "Moderate" in USDA's shrink-swell data, averaging 5.51% linear extensibility. That's a middle reading: not the sharp swings that crack a foundation outright, but enough that grading and drainage are worth getting right.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Dunklin County, MO - 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 Dunklin County will actually do.

Dunklin County: the real numbers

Dunklin 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, Dunklin County, MO ranks 214 most-constrained nationally, and 25 of 114 within Missouri. Dunklin County covers 542 square miles and counts 27,002 residents.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Citrus County, FL and Renville County, ND 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 Camden County, MO and Carroll County, MO. The full underlying dataset is downloadable directly, one row per county.