Spokane County, WA Shrink-Swell Risk

Spokane County's SSURGO shrink-swell reading

Low

In Spokane County, WA, 80% of the surveyed soil carries a "Low" shrink-swell rating, 2.11% 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

Spokane 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 Spokane County.

Budgeting for Spokane County, WA

Spokane 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.

Spokane County's rank among Washington counties

Among the 3,085 rated counties on this site, Spokane County, WA ranks 1,880 most-constrained nationally, and 11 of 39 within Washington. Spokane County covers 1,764 square miles and counts 555,947 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Burlington County, NJ and Blanco 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 Washington

Every county in Washington is on this site, including Snohomish County, WA and Wahkiakum County, WA. The full underlying dataset is downloadable directly, one row per county.