Gilliam County, OR Shrink-Swell Risk

Gilliam County, OR's soil, for shrink-swell risk

Low

Gilliam County, OR: USDA's soil survey rates 94.3% of the county "Low" for shrink-swell potential (1.71% linear extensibility). That's as favorable a county-level reading as this dataset produces - standard foundation practice, pending one lot's own geotechnical report.

What Gilliam County's reading doesn't cover

Two lots a mile apart in Gilliam County can carry different soil, even though they share one countywide reading. A local geotechnical report, typically $1,000-$5,000 (around $2,700 typical), is the only way to know what one lot in Gilliam County will actually do.

What it costs to find out, versus to ignore it

With Gilliam County, OR 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.

How Gilliam County, OR compares

Nationally, Gilliam County, OR is the 2,278-most-constrained of 3,085 rated counties for shrink-swell soil. Within Oregon alone it ranks 32 of 36. Gilliam County, OR is 1,205 square miles with a population of 1,971.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Morgan County, UT and Carter County, OK 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 Oregon

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