Clark County, ID Shrink-Swell Risk

Clark County, ID's soil, for shrink-swell risk

Low

Clark County, ID: USDA's soil survey rates 86.5% of the county "Low" for shrink-swell potential (1.9% 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 Clark County's reading doesn't cover

Two lots a mile apart in Clark County can carry different soil, even though they share one countywide reading. The real answer for one lot is still a site-specific geotechnical report, running about $1,000-$5,000 (typically near $2,700).

What it costs to find out, versus to ignore it

With Clark County, ID rating "Low", a geotechnical report is still worthwhile before a build, just less urgent than in a high-risk county. 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

Nationally, Clark County, ID is the 2,076-most-constrained of 3,085 rated counties for shrink-swell soil. Within Idaho alone it ranks 28 of 44. Clark County, ID is 1,763 square miles with a population of 794.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Mohave County, AZ and Hand County, SD 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

More of Idaho

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