Tillman County, OK Shrink-Swell Risk

Shrink-swell potential in Tillman County, OK

Moderate

Soil across 36.7% of Tillman County, OK comes back "Moderate" in USDA's shrink-swell data, averaging 4.55% linear extensibility. Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

What this number does and doesn't tell you

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

Tillman County: the real numbers

Tillman 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.

How Tillman County, OK compares

Among the 3,085 rated counties on this site, Tillman County, OK ranks 378 most-constrained nationally, and 11 of 77 within Oklahoma. Tillman County covers 871 square miles and counts 6,736 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Adams County, PA and Upton 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 Grant County, OK and Woods County, OK. The full underlying dataset is downloadable directly, one row per county.