Linn County, OR Shrink-Swell Risk

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

Moderate

Linn County, OR: USDA's soil survey rates 49.6% of the county "Moderate" for shrink-swell potential (3.44% linear extensibility). A real but modest amount of movement - standard foundations usually hold up, but drainage and moisture control around the foundation still matter more than on low-risk soil.

What Linn County's reading doesn't cover

Two lots a mile apart in Linn 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 Linn County, OR rating "Moderate", 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, Linn County, OR is the 874-most-constrained of 3,085 rated counties for shrink-swell soil. Within Oregon alone it ranks 5 of 36. Linn County, OR is 2,290 square miles with a population of 132,474.

Before you act on this

Orleans Parish, LA carries this site's most-constrained reading. Adair County, OK and Worth County, IA 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 Malheur County, OR and Grant County, OR. The full underlying dataset is downloadable directly, one row per county.