Clark County, WA Shrink-Swell Risk

Clark County's SSURGO shrink-swell reading

Low

In Clark County, WA, 68.3% of the surveyed soil carries a "Low" shrink-swell rating, 2.45% linear extensibility on average. Among the 3,144 counties on this site, that's the clean result: little shrink-swell movement, standard construction the likely outcome.

Before you rely on this for one address

Clark County's reading is an average across the whole county, not a promise about any one lot inside it. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Clark County will actually do.

Budgeting for Clark County, WA

Clark 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 Clark County, WA compares

Among the 3,085 rated counties on this site, Clark County, WA ranks 1,598 most-constrained nationally, and 4 of 39 within Washington. Clark County covers 629 square miles and counts 527,269 residents.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Gadsden County, FL and Ford County, KS 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 Thurston County, WA and Garfield County, WA. The full underlying dataset is downloadable directly, one row per county.