Washington County, ID Shrink-Swell Risk
Washington County's SSURGO shrink-swell reading
Low
In Washington County, ID, 86% of the surveyed soil carries a "Low" shrink-swell rating, 1.41% 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
Washington 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 Washington County, ID
Washington 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.
Washington County's rank among Idaho counties
Among the 3,085 rated counties on this site, Washington County, ID ranks 2,614 most-constrained nationally, and 42 of 44 within Idaho. Washington County, ID is 1,453 square miles with a population of 11,539.
Before you act on this
Orleans Parish, LA carries this site's most-constrained reading. Rockland County, NY and Doniphan 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 Idaho
Every county in Idaho is on this site, including Minidoka County, ID and Camas County, ID. The full underlying dataset is downloadable directly, one row per county.