Palo Alto County, IA Shrink-Swell Risk

Shrink-swell potential in Palo Alto County, IA

Moderate

Soil across 59.6% of Palo Alto County, IA comes back "Moderate" in USDA's shrink-swell data, averaging 3.26% linear extensibility. A real but modest amount of movement - standard foundations usually hold up, but drainage and moisture control around the foundation still matter more than on low-risk soil.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Palo Alto County, IA - 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 Palo Alto County.

Palo Alto County: the real numbers

Palo Alto 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, Palo Alto County, IA ranks 1,008 most-constrained nationally, and 71 of 99 within Iowa. Palo Alto County, IA is 564 square miles with a population of 8,809.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Culberson County, TX and Floyd County, IN 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 Iowa

Every county in Iowa is on this site, including Ida County, IA and Montgomery County, IA. The full underlying dataset is downloadable directly, one row per county.