McClain County, OK Shrink-Swell Risk

Shrink-swell potential in McClain County, OK

Low

Soil across 59% of McClain County, OK comes back "Low" in USDA's shrink-swell data, averaging 2.95% 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 McClain County, OK - 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 McClain County.

McClain County: the real numbers

McClain 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, McClain County, OK ranks 1,230 most-constrained nationally, and 52 of 77 within Oklahoma. The county spans 571 square miles, home to 48,434 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Venango County, PA and Robertson County, KY 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 Oklahoma

Every county in Oklahoma is on this site, including Choctaw County, OK and Seminole County, OK. The full underlying dataset is downloadable directly, one row per county.