Dallam County, TX Shrink-Swell Risk

Shrink-swell potential in Dallam County, TX

Moderate

Soil across 63.3% of Dallam County, TX comes back "Moderate" in USDA's shrink-swell data, averaging 3.03% 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 Dallam County, TX - never a reading for one specific parcel. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Dallam County: the real numbers

Dallam 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.

Dallam County's rank among Texas counties

Among the 3,085 rated counties on this site, Dallam County, TX ranks 1,182 most-constrained nationally, and 189 of 253 within Texas. Dallam County, TX is 1,503 square miles with a population of 7,526.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Middlesex County, VA and Warren County, IL 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 Texas

Every county in Texas is on this site, including Somervell County, TX and Briscoe County, TX. The full underlying dataset is downloadable directly, one row per county.