Ada County, ID Shrink-Swell Risk

Ada County's SSURGO shrink-swell reading

Low

In Ada County, ID, 57.4% of the surveyed soil carries a "Low" shrink-swell rating, 2.96% linear extensibility on average. 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.

Before you rely on this for one address

Ada County's reading is an average across the whole county, not a promise about any one lot inside it. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

Budgeting for Ada County, ID

Ada 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 Ada County, ID compares

Among the 3,085 rated counties on this site, Ada County, ID ranks 1,218 most-constrained nationally, and 7 of 44 within Idaho. The county spans 1,052 square miles, home to 535,799 people.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Jerauld County, SD and Presidio 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 Idaho

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