Graham County, AZ Shrink-Swell Risk

Shrink-swell potential in Graham County, AZ

Moderate

Soil across 41.8% of Graham County, AZ comes back "Moderate" in USDA's shrink-swell data, averaging 4.19% 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 Graham County, AZ - 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 Graham County.

Graham County: the real numbers

Graham 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.

Graham County's rank among Arizona counties

Among the 3,085 rated counties on this site, Graham County, AZ ranks 477 most-constrained nationally, and 1 of 15 within Arizona. The county spans 4,622 square miles, home to 40,242 people.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Edmunds County, SD and Val Verde 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 Arizona

Every county in Arizona is on this site, including Pinal County, AZ and Santa Cruz County, AZ. The full underlying dataset is downloadable directly, one row per county.