Louisa County, IA Shrink-Swell Risk

Shrink-swell potential in Louisa County, IA

Moderate

Soil across 70.6% of Louisa County, IA comes back "Moderate" in USDA's shrink-swell data, averaging 3.96% 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 Louisa 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 Louisa County.

Louisa County: the real numbers

Louisa 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, Louisa County, IA ranks 593 most-constrained nationally, and 46 of 99 within Iowa. The county spans 402 square miles, home to 10,630 people.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Swain County, NC and Martin 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 Iowa

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