Washington County, OR Shrink-Swell Risk

Washington County's SSURGO shrink-swell reading

Low

In Washington County, OR, 68.2% of the surveyed soil carries a "Low" shrink-swell rating, 2.72% 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

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, OR

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 Oregon counties

Among the 3,085 rated counties on this site, Washington County, OR ranks 1,393 most-constrained nationally, and 19 of 36 within Oregon. Washington County, OR is 724 square miles with a population of 611,272.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Miami County, KS and Miller County, MO 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 Oregon

Every county in Oregon is on this site, including Yamhill County, OR and Harney County, OR. The full underlying dataset is downloadable directly, one row per county.