Lewis County, ID Shrink-Swell Risk

Lewis County's SSURGO shrink-swell reading

Moderate

In Lewis County, ID, 47.1% of the surveyed soil carries a "Moderate" shrink-swell rating, 3.56% linear extensibility on average. That's a middle reading: not the sharp swings that crack a foundation outright, but enough that grading and drainage are worth getting right.

Before you rely on this for one address

Lewis County's reading is an average across the whole county, not a promise about any one lot inside it. 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 Lewis County.

Budgeting for Lewis County, ID

Lewis 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, Lewis County, ID ranks 805 most-constrained nationally, and 1 of 44 within Idaho. The county spans 479 square miles, home to 3,728 people.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Denton County, TX and Person County, NC 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 Idaho

Every county in Idaho is on this site, including Clearwater County, ID and Jefferson County, ID. The full underlying dataset is downloadable directly, one row per county.