Jefferson County, OR Shrink-Swell Risk

Shrink-swell potential in Jefferson County, OR

Low

Soil across 75.3% of Jefferson County, OR comes back "Low" in USDA's shrink-swell data, averaging 2.23% 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 this number does and doesn't tell you

This is a countywide, area-weighted figure across every soil survey map unit in Jefferson County, OR - never a reading for one specific parcel. A site-specific soil report, usually $1,000-$5,000, is what an engineer would actually pull before designing a foundation on a lot in Jefferson County.

Jefferson County: the real numbers

Jefferson 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.

Where this sits nationally

Among the 3,085 rated counties on this site, Jefferson County, OR ranks 1,775 most-constrained nationally, and 25 of 36 within Oregon. Jefferson County, OR is 1,782 square miles with a population of 25,536.

For contrast

Orleans Parish, LA carries this site's most-constrained reading. Sumter County, AL and Stone 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 Polk County, OR and Morrow County, OR. The full underlying dataset is downloadable directly, one row per county.