Coal County, OK Shrink-Swell Risk

Shrink-swell potential in Coal County, OK

Moderate

Soil across 57.5% of Coal County, OK comes back "Moderate" in USDA's shrink-swell data, averaging 4.86% 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 Coal 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 Coal County.

Coal County: the real numbers

Coal 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.

Coal County's rank among Oklahoma counties

Among the 3,085 rated counties on this site, Coal County, OK ranks 320 most-constrained nationally, and 8 of 77 within Oklahoma. Coal County covers 517 square miles and counts 5,414 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Box Elder County, UT and Sutton County, TX 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 Mayes County, OK and Bryan County, OK. The full underlying dataset is downloadable directly, one row per county.