Humboldt County, IA Shrink-Swell Risk

Shrink-swell potential in Humboldt County, IA

Moderate

Soil across 61.7% of Humboldt County, IA comes back "Moderate" in USDA's shrink-swell data, averaging 3.17% 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 Humboldt 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 Humboldt County.

Humboldt County: the real numbers

Humboldt 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 Humboldt County, IA compares

Among the 3,085 rated counties on this site, Humboldt County, IA ranks 1,071 most-constrained nationally, and 74 of 99 within Iowa. The county spans 434 square miles, home to 9,617 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Blue Earth County, MN and Dakota County, MN 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 Woodbury County, IA and Adair County, IA. The full underlying dataset is downloadable directly, one row per county.