Marion County, OR Shrink-Swell Risk

Marion County's SSURGO shrink-swell reading

Moderate

In Marion County, OR, 52.7% of the surveyed soil carries a "Moderate" shrink-swell rating, 3.28% linear extensibility on average. Conventional foundations are the reasonable expectation here, with routine moisture-control practice rather than special engineering.

Before you rely on this for one address

Marion County's reading is an average across the whole county, not a promise about any one lot inside it. 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 Marion County.

Budgeting for Marion County, OR

Marion 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, Marion County, OR ranks 987 most-constrained nationally, and 9 of 36 within Oregon. Marion County covers 1,181 square miles and counts 352,867 residents.

See how another county compares

Orleans Parish, LA carries this site's most-constrained reading. Robertson County, TN and Tioga County, PA 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 Clackamas County, OR and Hood River County, OR. The full underlying dataset is downloadable directly, one row per county.