Boise County, ID Shrink-Swell Risk

Shrink-swell potential in Boise County, ID

Low

Soil across 94.1% of Boise County, ID comes back "Low" in USDA's shrink-swell data, averaging 1.41% linear extensibility. That's the easiest starting point on this site's scale - a standard foundation is the reasonable default here, though any one lot can still differ.

What this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Boise County, ID - 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 Boise County.

Boise County: the real numbers

Boise 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 Boise County, ID compares

Among the 3,085 rated counties on this site, Boise County, ID ranks 2,616 most-constrained nationally, and 43 of 44 within Idaho. Boise County, ID is 1,899 square miles with a population of 8,581.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Pike County, IL and Sanders County, MT 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 Bonneville County, ID and Custer County, ID. The full underlying dataset is downloadable directly, one row per county.